Invasive Species Compendium

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Datasheet

Euwallacea perbrevis
(tea shot-hole borer)

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Datasheet

Euwallacea perbrevis (tea shot-hole borer)

Summary

  • Last modified
  • 07 January 2021
  • Datasheet Type(s)
  • Invasive Species
  • Pest
  • Natural Enemy
  • Preferred Scientific Name
  • Euwallacea perbrevis
  • Preferred Common Name
  • tea shot-hole borer
  • Taxonomic Tree
  • Domain: Eukaryota
  •   Kingdom: Metazoa
  •     Phylum: Arthropoda
  •       Subphylum: Uniramia
  •         Class: Insecta
  • Summary of Invasiveness
  • Species in Euwallacea and related genera are currently considered quarantine pests. Members of the tribe Xyleborini (which includes the genus Euwallacea) are some of the most successful invaders, as they are commonly intercepted...

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Pictures

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PictureTitleCaptionCopyright
Euwallacea perbrevis (tea shot-hole borer); damage in tea bushes. Note broken branches due to larval boring.
TitleSymptoms
CaptionEuwallacea perbrevis (tea shot-hole borer); damage in tea bushes. Note broken branches due to larval boring.
Copyright©Nalini C. Gnanapragasam
Euwallacea perbrevis (tea shot-hole borer); damage in tea bushes. Note broken branches due to larval boring.
SymptomsEuwallacea perbrevis (tea shot-hole borer); damage in tea bushes. Note broken branches due to larval boring.©Nalini C. Gnanapragasam
Euwallacea perbrevis (tea shot-hole borer); damage in tea bushes showing broken branches due to larval boring.
TitleSymptoms
CaptionEuwallacea perbrevis (tea shot-hole borer); damage in tea bushes showing broken branches due to larval boring.
Copyright©Nalini C. Gnanapragasam
Euwallacea perbrevis (tea shot-hole borer); damage in tea bushes showing broken branches due to larval boring.
SymptomsEuwallacea perbrevis (tea shot-hole borer); damage in tea bushes showing broken branches due to larval boring.©Nalini C. Gnanapragasam
Euwallacea perbrevis (tea shot-hole borer); damage in tea branches showing galleries.
TitleSymptoms
CaptionEuwallacea perbrevis (tea shot-hole borer); damage in tea branches showing galleries.
Copyright©Nalini C. Gnanapragasam
Euwallacea perbrevis (tea shot-hole borer); damage in tea branches showing galleries.
SymptomsEuwallacea perbrevis (tea shot-hole borer); damage in tea branches showing galleries.©Nalini C. Gnanapragasam
Euwallacea perbrevis (tea shot-hole borer); damage in a tea stump showing galleries.
TitleSymptoms
CaptionEuwallacea perbrevis (tea shot-hole borer); damage in a tea stump showing galleries.
Copyright©Nalini C. Gnanapragasam
Euwallacea perbrevis (tea shot-hole borer); damage in a tea stump showing galleries.
SymptomsEuwallacea perbrevis (tea shot-hole borer); damage in a tea stump showing galleries.©Nalini C. Gnanapragasam

Identity

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Preferred Scientific Name

  • Euwallacea perbrevis (Schedl 1951)

Preferred Common Name

  • tea shot-hole borer

Other Scientific Names

  • Xyleborus perbrevis Schedl, 1951

International Common Names

  • English: shot-hole borer of tea
  • French: scolyte du Ceylon theier

Local Common Names

  • Germany: teezweig-bohrer

Summary of Invasiveness

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Species in Euwallacea and related genera are currently considered quarantine pests. Members of the tribe Xyleborini (which includes the genus Euwallacea) are some of the most successful invaders, as they are commonly intercepted at ports of entry, and because of biological and ecological characteristics, they also get easily established compared to other wood borers (Brockerhoff and Liebhold, 2017). Species within this tribe are all inbreeding, with an haplodiploid system, where diploid females mate with haploid brothers within the parental gallery system before dispersal. Because they have a small size and travel within wood, the introduction of only one or a few mated females may lead to establishment if suitable host plants can be found and environmental conditions are satisfactory. A very wide range of host plants have been recorded for many of the species of Euwallacea and related genera. Any woody material of a suitable size and moisture content may be all that is required. The direct risk of establishment of populations of E. perbrevis in areas of the world outside its present distribution, and particularly in further tropical and subtropical parts of Africa and the Americas, should be considered as a serious threat to natural and planted ecosystems.

Taxonomic Tree

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  • Domain: Eukaryota
  •     Kingdom: Metazoa
  •         Phylum: Arthropoda
  •             Subphylum: Uniramia
  •                 Class: Insecta
  •                     Order: Coleoptera
  •                         Family: Curculionidae
  •                             Subfamily: Scolytinae
  •                                 Genus: Euwallacea
  •                                     Species: Euwallacea perbrevis

Notes on Taxonomy and Nomenclature

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Euwallacea perbrevis was described by Schedl in 1951 as Xyleborus perbrevis. The genus Euwallacea was described by Hopkins in 1915 and was considered a synonym of Xyleborus until Wood (1980a, 1986) recognized Euwallacea as a distinct genus, on the basis of slight morphological and biological differences. Wood (1989) transferred X. fornicatus to the genus Euwallacea. Earlier references to the species are listed by Wood and Bright (1992), and additional references by Bright and Skidmore (1997, 2002).

The emerging pest species complex Euwallacea fornicatus Eichhoff sensu lato has recently undergone a taxonomic revision (Gomez et al., 2018; Smith et al., 2019). Several specimens in the native and introduced range fitting the species description were found to be genetically different, with three recognized clades named as tea shot-hole borer (TSHB), polyphagous shot hole borer (PSHB) and kuroshio shot hole borer (KSHB) (Stouthamer et al., 2017). Because the type specimen used by Eichhoff to describe X. fornicatus was lost during World War II, there was a taxonomic confusion regarding the different clades within the species complex. More recently, a taxonomic revision of the species complex using molecular and morphological data revealed four species (Gomez et al., 2018), resurrecting synonymized species and describing a new species: E. fornicatus (Eichhoff 1868) (part of the TSHB clade), E. fornicatior (Eggers 1923) (part of the TSHB clade), E. whitfordiodendrus (Schedl 1942) (PSHB clade) and E. kuroshio Gomez and Hulcr 2018 (KSHB clade). Soon after, a member of the syntype series of E. fornicatus was discovered, which did not match the specimens used to represent the species. To resolve this, the name Euwallacea fornicatus was applied to PSHB and the TSHB was represented by E. perbrevis (Smith et al., 2019).

Euwallacea fornicatus’ in Sri Lanka was first referred to as the ‘tea shot hole borer’ by Speyer (1917) and was extensively used in the literature in publications regarding biology and control. Following Smith et al. (2019) reassessment of the species complex, and given the size of the species referred in the literature as the tea shot-hole borer collected from tea, it is most likely that E. perbrevis, not E. fornicatus is the tea shot-hole borer.

Description

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The published descriptions of various life stages summarized below were all made before the species was recognized as a species complex, so the specific identity within the species complex for these descriptions are generally unknown. No morphological variation between the species within the complex is known.

Eggs

The eggs of E. perbrevis have not been described. However, the eggs of the related genus Xyleborus are very small (0.3 mm long), round and partly translucent, with a smooth surface. They are laid singly or in groups. Freshly laid eggs are pale, but they gradually darken before eclosion, hatching in 4 to 6 days.

Larvae

The larva of E. perbrevis is described by Gardner (1934). The mature larva is about 3.5 mm long and 1.1 mm wide. Larvae are white, legless, C-shaped, with a reddish head, taking 16-18 days to pupate. The head is colourless, about 0.5 mm wide, with the anterior margin nearly straight. The anterior margin of the labrum is nearly straight in the middle, while the posterior margin has a strong median extension. The anterior margin of the epipharynx has a very distinct and regular row of large blade-shaped setae; the internal rods are slightly incurved and the two pairs of setae between the rods are very small and close together, with the anterior pair much more widely separated than the posterior pair. The apical segment of the maxillary palps is stout and distinctly longer than wide. The labial palps are widely separated, with a globular apical segment. Each abdominal segment has two folds on the dorsal surface. The body integument is smooth except for a few scattered minute spicules.

Pupae

Pupae are a similar size to adults and are white. Pupae eclose after 7-9 days.

Adults

Adults females are dark brown to almost black, with a body length of 2.2-2.6 mm. This species has an elytral length of 1.45-1.57 mm (measured from base to apex in lateral view) and a pronotum length of 1.05-1.11 mm (measured from base to apex in lateral view) (Gomez et al., 2018). The pronotum is as long as wide, subcircular anteriorly with serrations. The antennal funicle is five-segmented, and the club has the second and third segment visible from the posterior face, matching a type 3 club (Hulcr et al., 2007). The protibia has 7 to 10 socketed denticles on the edge. The elytral declivity is convex and gradually sloped. Punctures in elytral striae and interstriae are in rows, not impressed and large in striae, and with large hair-like setae in interstriae. The posterolateral margin of the elytral declivity has a sharp edge or costa. The males are wingless and smaller than the females, 1.50-1.67 mm long (Kalshoven, 1958). A gallery would have only one or a few males to many females, and they are rarely found outside the gallery.

Distribution

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The Euwallacea species complex has been reported from many regions, and many of these are as ‘Euwallacea fornicatus’. The list is based on morphologically or genetically confirmed examples of Euwallacea perbrevis sensu Smith et al. (2019).

E. perbrevis is considered to be native to South-East Asia through to Australia, being recorded from Australia, American Samoa, Brunei Darussalam, China (Hainan), Fiji, India, Indonesia (Java), Japan (Okinawa), Malaysia (Java, Sabah), Palau, Papua New Guinea, Philippines, Réunion, Singapore, Samoa, Sri Lanka, Taiwan, Thailand, Timor Leste and Vietnam (Stouthamer et al., 2017; Gomez et al., 2018; Smith et al., 2019). It has been introduced in USA (Hawaii and Florida), Costa Rica and Panama (reported as E. fornicatus) (Kirkendall and Odegaard, 2007).There are unpublished records from Brunei Darussalam and New Caledonia (RA Beaver, Chiangmai, Thailand, personal communication, 2004). Kalshoven (1981) included Sierra Leone in the distribution of E. perbrevis; however, this is believed to be erroneous. The species has not yet been reliably recorded from the African mainland.

The distribution in this summary table is based on all the information available for E. perbrevis. As the E. fornicatus species complex was recently addressed, additional records found in the literature might correspond to other species within the complex.

Distribution Table

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The distribution in this summary table is based on all the information available. When several references are cited, they may give conflicting information on the status. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report.

Last updated: 07 Jan 2021
Continent/Country/Region Distribution Last Reported Origin First Reported Invasive Reference Notes

Africa

RéunionPresentIntroducedInvasive

Asia

BruneiPresentNative
ChinaPresentNative
Hong KongPresent
IndiaPresent
IndonesiaPresent
MalaysiaPresent, Widespread
PhilippinesPresentNative
SingaporePresentNative
Sri LankaPresentNative
TaiwanPresentNative
ThailandPresentNative
VietnamPresentNative

North America

Costa RicaPresent, Localized
PanamaPresentIntroducedInvasive
United StatesPresent, Localized
-FloridaPresent
-HawaiiPresentIntroducedInvasive

Oceania

American SamoaPresentIntroduced2018Invasive
AustraliaPresentIntroducedInvasive
FijiPresentIntroducedInvasive
PalauPresent
Papua New GuineaPresentIntroducedInvasive
SamoaPresentIntroducedInvasive
Timor-LestePresentNative

History of Introduction and Spread

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E. perbrevis is presumed to be accidentally introduced to New Guinea, Australia and Pacific Islands, and tropical Americas. Many of these records are part of the first thorough treatment of bark and ambrosia beetles in the area, so exact timings of introductions are not known. The first records in Hawaii were in the 1950s, and the first records in Florida were in the early 2000s (Schedl, 1959; Eskalen et al., 2012). The pathways of introduction are not known, but are probably distributed with live plants or untreated wood material.

Risk of Introduction

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Several other species of Euwallacea with similar habits to E. perbrevis have been imported to tropical and subtropical areas around the world. The risk of introduction outside its present geographic range must be considered high. Having been accidentally introduced to both Hawaii and eastern USA (Florida), it seems likely that it will spread further. There is a clear danger of damage to tea plantations in Africa and South America if the species establishes in those regions. The most common fungal symbionts associated with E. perbrevis in Florida were Fusarium sp. and Graphium sp. (Carrillo et al., 2016). The symbiotic fungus invades the tree vascular tissue, causing branch dieback and mortality of a broad range of tree hosts (Eskalen et al., 2013). Symbionts can be switched or shared in the genus Euwallacea (Kasson et al., 2013; O’Donnell et al., 2015; Dodge et al., 2017) highlighting the potential threat of other species in this genus. Closely related species to E. perbrevis can cause significant damage, such as E. fornicatus which causes branch dieback when it introduces its symbiotic fungus Fusarium euwallaceae (Eskalen et al., 2012; Freeman et al., 2013).

Hosts/Species Affected

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Members of Euwallacea and the related genera Ambrosiodmus, Xyleborinus, Xyleborus and Xylosandrus are all ambrosia beetles that feed and breed in a variety of forest trees and shrubs. Depending on the species, they may be found in small branches and seedlings to large logs. All are potentially damaging to agriculture and/or forestry under suitable conditions. Many species, currently considered of only minor importance, may become important pests in agriculture and forestry as a result of the interaction between ambrosia beetles and naïve hosts, the expansion of forest and tree crop plantations, and changes in environmental conditions from climate change and land use increasing the susceptibility of hosts.

E. perbrevis attacks a very wide range of host trees, including many commodity trees. It typically attacks stems and branches that are damaged, stressed or dying. Attacks on healthy plants are reported (Kalshoven, 1958; Browne, 1968). However, healthy plants can sometimes resist attack by exuding gum or latex in which the beetle can become entrapped (Kalshoven, 1958; Danthanarayana, 1968). As the taxonomic identity of the E. fornicatus species complex was recently addressed, most host records have been reported with no clear distinction within species. Gomez et al. (2019) updated the species complex host list to more than 400 species in 75 families, reporting 110 as breeding hosts. In the 1960s, 99 species of plant hosts, including 21 reproductive hosts, were recorded across the native distribution of E. perbrevis in Sri Lanka, India and South-East Asia (Browne, 1961; Danthanarayana, 1968). In USA (Florida), Euwallacea has been recorded from avocado, mango, soursop, royal poinciana, swampbay, wild tamarind and albizia (Carrillo et al., 2012; Owens et al., 2018).

A revision of reproductive and non-reproductive hosts for the E. fornicatus species complex was recently conducted by Gomez et al. (2019).

Host Plants and Other Plants Affected

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Plant nameFamilyContextReferences
Acacia decurrens (green wattle)FabaceaeUnknown
Artocarpus altilis (breadfruit)MoraceaeUnknown
  • Hulcr et al. (2007)
Artocarpus integer (champedak)MoraceaeOther
    Austroeupatorium inulifoliumAsteraceaeUnknown
    Azadirachta indica (neem tree)MeliaceaeUnknown
    Bixa orellana (annatto)BixaceaeOther
      Calliandra houstoniana var. calothyrsus (calliandra)FabaceaeUnknown
      Camellia sinensis (tea)TheaceaeMain
      Castanopsis (evergreen chinkapin)FagaceaeWild host
        Ceiba pentandra (kapok)BombacaceaeOther
          Cinchona calisaya (quinine)RubiaceaeOther
            Citrus aurantiacaRutaceaeOther
              CrotalariaFabaceaeWild host
                Durio zibethinus (durian)BombacaceaeOther
                Erythrina subumbrans (December tree)FabaceaeWild host
                  Falcataria moluccana (batai wood)FabaceaeMain
                  Flemingia macrophylla (large leaf flemingia)FabaceaeUnknown
                  Gmelina arborea (candahar)LamiaceaeMain
                    Grevillea robusta (silky oak)ProteaceaeOther
                    Hevea brasiliensis (rubber)EuphorbiaceaeOther
                      Jacaranda mimosifolia (jacaranda)BignoniaceaeUnknown
                      Litchi chinensis (lichi)SapindaceaeOther
                        Macadamia integrifolia (macadamia nut)ProteaceaeOther
                          Mangifera indica (mango)AnacardiaceaeOther
                            Persea americana (avocado)LauraceaeOther
                            Platanus acerifolia (London planetree)PlatanaceaeOther
                              Psidium guajava (guava)MyrtaceaeOther
                                Punica granatum (pomegranate)PunicaceaeOther
                                  Ricinus communis (castor bean)EuphorbiaceaeMain
                                    Robinia pseudoacacia (black locust)FabaceaeUnknown
                                    Schleichera oleosa (Macassar oil tree)SapindaceaeWild host
                                      Tectona grandis (teak)LamiaceaeOther
                                        Tephrosia (hoary-pea)FabaceaeOther
                                          Terminalia catappa (Singapore almond)CombretaceaeWild host
                                            Theobroma cacao (cocoa)MalvaceaeOther

                                              Growth Stages

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                                              Vegetative growing stage

                                              Symptoms

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                                              E. perbrevis bores into the stems and branches of suitable hosts, initially visible as circular, 1.5 mm holes with white frass in addition to resin, latex or other plant host defences depending on the species attacked. In avocado growing in dry conditions, a white exudate forms, known as a ‘sugar volcano’ (Eskalen et al., 2013). Repeated attacks by E. perbrevis in successive pruning cycles cause severe chronic debilitation of the tea bushes. Following attack, branches become weak, unproductive, wilted, susceptible to further attack, and usually eventually dieback of the branch. The physical damage to the branch may result in it breaking and falling. Trees and shrubs become weakened and disfigured from losing branches.

                                              List of Symptoms/Signs

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                                              SignLife StagesType
                                              Stems / dieback
                                              Stems / internal feeding
                                              Stems / rot
                                              Whole plant / dwarfing
                                              Whole plant / plant dead; dieback

                                              Biology and Ecology

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                                              Browne (1961) reviewed the biology and ecology of E. perbrevis in South-East Asia. Muraleedharan (1986) described its biology on tea in India. Wood and Bright (1992) gave several hundred references relating to the biology, habits, taxonomy and control of E. perbrevis. The biology and ecology of E. perbrevis is probably very similar to that of other species in the E. fornicatus species complex.

                                              The major factors that determine the intensity of attacks on tea in southern India are the state of maturity of the branches, the height of pruning, the time of pruning, and the length of the pruning cycle (Muraleedharan et al., 2003). The primary branches formed after pruning are more susceptible to attack, and attack densities are higher in blocks under a longer pruning cycle (Muraleedharan et al., 2003). The distribution of attacks on tea plants is also discussed by Sivapalan (1975).

                                              Adult females disperse during the day attacking hosts in a range 30-35 m, but they can travel 400 m (Browne, 1961; Owens et al., 2019a). Females bore a bifurcated or simple tunnel in the twigs or branches of the host, so that it encircles the stem. If the host material is of a small diameter, one or two branch tunnels may be constructed. These may be straight or spiral and are often longer than 5 cm.

                                              Egg-laying begins as soon as the entrance tunnel is completed. Eggs are laid singly or in small clusters. In Malaysia, egg production continues fairly steadily for about 10 days, after which there is a marked decline, although laying may proceed at intervals for at least an additional 10 days. In Java, broods may include 15-20 individuals (Kalshoven, 1958). In Sri Lanka, the maximum per brood was 34 individuals (Gadd, 1941). In Malaysia, Browne (1961) reported that three galleries in Pajanelia sp. averaged 28.3 individuals per brood.

                                              Males are produced in much smaller numbers, and develop more rapidly than females. The males cannot fly and do not normally leave the parental gallery, although they sometimes emerge and crawl on the surface of the bark. Occasionally, these males may enter a gallery made by another female and mate with the females in that gallery system; thus a very small amount of cross-breeding occurs. The larvae live in the parental galleries. The female larvae pass through three instars (Gadd, 1941; Browne, 1961). The larvae pupate together in the tunnels. After emergence from the pupal stage, the young females remain in the galleries for several days, during which time they are fertilized by their brothers. Mated females emerge through the original entrance tunnel and fly to new hosts. They fly during the day and are not attracted to light. In tea plantations they seldom fly higher than 2 m (Judenko, 1956).

                                              In Malaysia, Browne (1961) found that the parent beetle raises only one brood, and dies when her offspring have flown. In the lowlands of Peninsular Malaysia, the life-cycle takes 29-33 days. However, eggs continue to be produced for about 3 weeks and it is possible that the emergence of adults from the host may continue for a similar period (Browne, 1961). In southern India, Muraleedharan (1983) reported that the egg, larval and pupal stages lasted 8-10, 21-26 and 10-12 days, respectively. The developmental period varies with altitude, temperature and predation, but most of the new generation emerge about 5-6 weeks after the host is infested. Cooperband et al. (2016) found that adults develop in 22 days at 24°C, producing 68 female adults in 6 weeks, 7% of which are males. The ratio of females to males is low compared to many other ambrosia beetles. In Java, it has been estimated as 9:1 (Kalshoven, 1958), and in Sri Lanka as 4:1 (Beeson, 1941) and 3:1 (Judenko, 1956). In Malaysia, Browne (1961) examined several complete broods and reported there were four or five females to each male.

                                              Like all ambrosia beetles, E. perbrevis feeds on a symbiotic fungus that is cultivated in the xylem of woody plants (Batra, 1967). The symbiotic fungi, introduced into the gallery by the attacking female, serves as their source of nutrition for larvae, with severe pathogenic effects for some species. The spores of the ambrosia fungus are stored and carried in a specialized structure called mycangia (Batra, 1963) located near the mandibles of the adult female (Fernando, 1960). The spores travel from the mycangia through ducts to the buccal cavity and are then deposited in the gallery using the mandibles and maxillae. Early work on the ambrosia fungi (e.g. Speyer, 1923; Gadd and Loos, 1947) should not be relied on, because of problems with fungal taxonomy and contamination of fungal cultures. In southern India, Mouli and Kumar (1988) found the fungus Fusarium tumidum in the tunnels of E. perbrevis in tea branches. Somasekhara et al. (2000) isolated the phytopathogen, Ceratocystis fimbriata, from E. perbrevis in wilting pomegranate trees in Karnataka and Maharashtra. Fusarium bugnicourtii is given as the ambrosia fungus by UPASI Tea Research Foundation, Kerala, India (2003a). Carrillo et al. (2016) found Fusarium sp. and Graphium sp. as the most common fungal symbionts associated with E. perbrevis in Florida. The vectorized fungus invades the vascular tissue of the host, causing necrosis, gum exudates, branch dieback, and potential mortality in several host species.

                                              Natural enemies

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                                              Natural enemyTypeLife stagesSpecificityReferencesBiological control inBiological control on
                                              Beauveria bassiana Pathogen Adults Selvasundaram and Muraleedharan (2000)

                                              Notes on Natural Enemies

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                                              The immature stages have few natural enemies. Muraleedharan et al. (1988) recorded no animal natural enemies of E. perbrevis in a survey in southern India, and none appear to have been recorded elsewhere. The female parent remains for much of the time in or near the gallery entrance whilst the immature stages are developing, preventing the entry of potential predators and parasitoids. Provided that the female remains alive and the growth of the ambrosia fungus on which the larvae feed is satisfactory, mortality of the immature stages is likely to be very low. Most mortality is probably during the dispersal of the adults, and during gallery establishment. Adults have been found in the crop contents of the swiftlet (Collocalia fuciphaga) (Beaver and Browne, 1979) and they are predated by lizards, clerid beetles and ants as they attempt to bore into the host tree. Recently, the occurrence of the pathogenic fungus, Beauveria bassiana, on E. perbrevis adults has been noted in Tamil Nadu, India (Selvasundaram and Muraleedharan, 2000). Signs of adult parasitoids have been found in China, observing exit holes in the abdomen of a few individuals, yet the species responsible is still unknown (Li et al., 2016).

                                              Means of Movement and Dispersal

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                                              Natural Dispersal

                                              Active flight is one of the main means of movement to previously uninfected areas. Adult females can fly up to 400 m, but usually will attack hosts in a range of 35 m. However, the increasing global movement of commodities has significantly increased the transport of this and related species in timber and wood packaging material, such as dunnage and crating.

                                              Vector Transmission

                                              Both adults and larvae of E. perbrevis are dependent on the growth of the symbiotic fungus on the walls of the gallery system in the wood for their food (Beaver, 1989). However, other pathogenic fungi can be transported on the cuticle of the beetle, as has been shown for other severe ambrosia beetles (Carrillo et al., 2014) although their chance of survival there is much lower than in the mycangial pouch. For example, E. perbrevis is associated with the spread of Ceratocystis fimbriata in southern India (Somasekhara and Wali, 2000; Somasekhara et al., 2000).

                                              Plant Trade

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                                              Plant parts liable to carry the pest in trade/transportPest stagesBorne internallyBorne externallyVisibility of pest or symptoms
                                              Bark adults Yes Pest or symptoms usually visible to the naked eye
                                              Stems (above ground)/Shoots/Trunks/Branches adults; eggs; larvae; pupae Yes Pest or symptoms not visible to the naked eye but usually visible under light microscope
                                              Wood adults; eggs; larvae; pupae Yes Pest or symptoms not visible to the naked eye but usually visible under light microscope
                                              Plant parts not known to carry the pest in trade/transport
                                              Bulbs/Tubers/Corms/Rhizomes
                                              Flowers/Inflorescences/Cones/Calyx
                                              Fruits (inc. pods)
                                              Growing medium accompanying plants
                                              Leaves
                                              Roots
                                              Seedlings/Micropropagated plants
                                              True seeds (inc. grain)

                                              Wood Packaging

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                                              Wood Packaging liable to carry the pest in trade/transportTimber typeUsed as packing
                                              Loose wood packing material Fresh twigs or branches Yes
                                              Solid wood packing material with bark Fresh unseasoned wood Yes
                                              Solid wood packing material without bark Fresh unseasoned wood Yes
                                              Wood Packaging not known to carry the pest in trade/transport
                                              Non-wood
                                              Processed or treated wood

                                              Impact Summary

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                                              CategoryImpact
                                              Animal/plant collections None
                                              Animal/plant products None
                                              Biodiversity (generally) None
                                              Crop production Negative
                                              Environment (generally) None
                                              Fisheries / aquaculture None
                                              Forestry production Negative
                                              Human health None
                                              Livestock production None
                                              Native fauna None
                                              Native flora Negative
                                              Rare/protected species None
                                              Tourism None
                                              Trade/international relations None
                                              Transport/travel None

                                              Impact

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                                              E. perbrevis impacts tea severely in at least 10 different countries (Li et al., 2015), mostly damaging plantations in India and Sri Lanka for several decades (Cranham, 1966; Danthanarayana, 1968). It seriously affects about one-third of the tea acreage in Sri Lanka, although it does not occur in tea above an altitude of 1300 m. E. perbrevis is a relatively minor pest of tea in South-East Asia. Waterhouse (1993) notes that the species is locally important in Malaysia.

                                              There is little precise information about the crop loss caused by E. perbrevis or other tea pests. In Sri Lanka, the loss of crop in 1953-1955 was estimated as 8-9% and possibly over 20% (Portsmouth, 1956). Cranham (1966) considered these estimates were reasonable. In Sri Lanka, the level of attacks is related to the pruning cycle, and negatively correlated with the crop size in the preceding month (Sivapalan, 1977).

                                              In southern India (Karnataka and Maharashtra), E. perbrevis has recently become a serious pest of pomegranate. Somasekhara and Wali (2000) found that damage caused by the wilt fungus, Ceratocystis fimbriata, which is vectored to some extent by the beetle, caused monetary loss worth Rs. 67.45 lakhs during 1996-1997 and Rs. 26.9 lakhs during 1999-2000. Attacks in Maharashtra are positively related to humidity, and negatively related to temperature (Mote and Tambe, 2000a).

                                              Also in Kerala, Mathew (1985), Mathew and Nair (1986) and Nair and Mathew (1988) consider that E. perbrevis is a major pest of Albizia falcataria, and a potentially serious pest of Gmelina arborea, both of which are fast-growing forest plantation trees.

                                              In 2002, it was recorded from USA (Florida), with minor impacts recorded (Rabaglia et al., 2006). Since 2012, it has been increasingly recorded in avocado groves in southern Florida, with significant levels of damage (Carrillo et al., 2016).

                                              Prevention and Control

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                                              Due to the variable regulations around (de)registration of pesticides, your national list of registered pesticides or relevant authority should be consulted to determine which products are legally allowed for use in your country when considering chemical control. Pesticides should always be used in a lawful manner, consistent with the product's label.

                                              Host-Plant Resistance

                                              In Sri Lanka and southern India, several tea varieties have been developed that show at least partial resistance to E. perbrevis (Jayasuriya, 1979; Rao, 1979; Thirugnanasuntharan and Jayachandran, 1989).

                                              The high concentrations of caffeine found in some tea clones inhibit or prevent the growth of the ambrosial fungus. Kumar et al. (1995) reported that tea clone TRI 2023, which is only slightly susceptible to E. perbrevis, accumulates higher concentrations of caffeine than clone TRI 2025, which is more susceptible to E. prebrevis.

                                              Biological Control

                                              Following the discovery of the entomopathogenic fungus, Beauveria bassiana, attacking E. perbrevis adults in Tamil Nadu (Selvasundaram and Muraleedharan, 2000), the strain of the fungus involved has been developed as a means of biological control. It significantly reduces the beetle population, and is now available commercially as a wettable powder (UPASI Tea Research Foundation, 2003b).

                                              A further recent development is the use of an alternative attractant to lure the beetles away from the tea bushes. UPASI Tea Research Foundation (2003a) suggests the use of cut stems of Montanoa bipinnatifida (Asteraceae) placed in infested plantations to attract the beetles, which may later be killed by burning the stems.

                                              Chemical Control

                                              The decision to use chemical control is influenced by the difficulties of application (E. perbrevis feeds deep in the wood of infested branches), the cost, and environmental concerns. Ornamental trees of high value should be protected in advance with a systemic insecticide before infestation occurs. Preventive treatments with emamectin benzoate combined with the systemic fungicide propiconazole, were shown to be effective in reducing colonization of E. fornicatus, a closely related species (Grosman et al., 2019). However, this control measure is not approved in the USA for some agricultural products such as avocado. Preventive sprays in the bark can also be effective, but they need to be re-applied frequently.

                                              For tea plantations, deltamethrin can be applied during the peak activity time of E. perbrevis in the second and third years of the 3-year pruning cycle of tea, to significantly reduce infestation levels (Muraleedharan and Radhakrishnan, 1994). In India, both fenvalerate and cypermethrin, sprayed on tea plants at different concentrations reduced E. perbrevis infestation to 5%, compared with an infestation rate of 33% for plants that received no treatment (Muraleedharan et al., 1992). Selvasundaram et al. (2001) found that Lambda-cyhalothrin 2.5 EC was more effective in reducing E. perbrevis populations than fenvalerate. Against attacks on pomegranate, Mote and Tambe (2000b) found that chlorpyrifos applied as a paste to the tree trunk was the most effective and economical insecticides for the control of the pest. The addition of geru (red soil) and copper oxychloride to the insecticides increased the control of insect pests.

                                              The effect of potassium acetate and zinc acetate, when applied at concentrations of 0.5, 1.0 and 1.5 g/bush, 4, 8 and 12 months after pruning, on the incidence of E. perbrevis on mature tea plants was studied by Ranasinghe and Wickremasinghe (1988) in Sri Lanka. The number of pupae and adults in treated plots was significantly reduced for up to 21 months after pruning. Earlier studies by Wickremasinghe and Thirugnanasuntheram (1980) indicated the same effect; the mechanism of action of potassium acetate was thought to be related to its conversion to saponins and/or sterol analogues that interfere with pupation.

                                              Soil applications of granular systemic insecticides proved ineffective against E. perbrevis in India (Mote and Tambe, 1990).

                                              Push-pull strategies using quercivorol and ɑ-copaene as attractants in white sticky traps and verbenone as deterrents have been also suggested as a viable control strategy (Kendra et al., 2017; Owens et al., 2019b).

                                              Cultural Control

                                              Periodic surveys for trees with branch dieback and signs of beetle colonization is recommended. In avocado plantations, small and mid-size branches will show the presence of ‘sugar volcanos’ (sugar exudates) as a clear sign of infestation. Once the infested branches and/or trees are detected, they should be removed and destroyed, either chipping, burning or burying. Chipping should be conducted to obtain sizes smaller than 5 cm (Jones and Paine, 2015). If chipping or burning is not feasible for trees, they can be covered by a tarp and exposed to direct sun. Pruning affected branches was an effective measure in Florida and Israel, where closely related species caused similar damage.

                                              Recent changes in cultural practices in tea plantations in Sri Lanka have increased yields but have intensified pest problems, particularly the damage caused by E. perbrevis. The most important damage caused by E. perbrevis is to the primary branches (those generally removed in low pruning but left in high pruning), therefore low pruning every two to three pruning cycles has been recommended (Sivapalan and Delucchi, 1974).

                                              To successfully decrease the spread of E. perbrevis, local awareness campaigns should focus on not moving wood.

                                              Integrated Pest Management

                                              IPM programmes combining cultural and chemical control have been developed and implemented, especially in southern India (Muraleedharan, 1995).

                                              UPASI Tea Research Foundation (2003a) summarizes suggestions and recommendations for the control of E. fornicatus in India. These include attention to pruning height, adding fertilizer to pruned fields, spraying of entomopathogenic fungus, use of alternative attractant, and chemical treatment.

                                              Management is based on early detection, sanitation and preventive measures. Infested branches should be removed and destroyed (chipped, burned or buried). Heavily infested trees need to be taken out and destroyed (chipped, burned, or covered by a tarp under direct sun (‘solarization’). High-value ornamental trees can be protected before any infestation by injection of systemic insecticides. Preventive treatments with emamectin benzoate alone (systemic insecticide) or combined with propiconazole (systemic fungicide), significantly reduced attack and colonization of E. fornicatus in California (Grosman et al., 2019).

                                              References

                                              Top of page

                                              Amarasinghe, L. D., Devy, N. T., 2003. Preliminary studies on screening plant species for potential diversionary hosts for Xyleborus fornicatus of tea. Sri Lanka Journal of Tea Science, 68(1), 5-11.

                                              APPPC, 1987. Insect pests of economic significance affecting major crops of the countries in Asia and the Pacific region. Technical Document No. 135. Bangkok, Thailand: Regional Office for Asia and the Pacific region (RAPA)

                                              Batra LR, 1963. Ecology of ambrosia fungi and their dissemination by beetles. Transactions of the Kansas Academy of Science (1903-), 66(2), 213-236.

                                              Batra, L. R., 1967. Ambrosia fungi: a taxonomic revision and nutritional studies of some species. Mycologia, 59(6), 976-1017. doi: 10.2307/3757271

                                              Beaver RA, 1989. Insect-fungus relationships in the bark and ambrosia beetles. Insect-fungus interactions. 14th Symposium of the Royal Entomological Society of London in collaboration with the British Mycological Society [edited by Wilding, N.; Collins, N.M.; Hammond, P.M.; Webber, J.F.] London, UK; Academic Press, 121-143

                                              Beaver RA, 1990. New records and new species of bark and ambrosia beetles from Thailand (Coleoptera; Scolytidae and Platypodidae). Deutsche Entomologische Zeitschrift, 37(4-5):279-284

                                              Beaver RA, Browne FG, 1979. The Scolytidae and Platypodidae (Coleoptera) of Penang, Malaysia. ORIENTAL INSECTS, 12(1978):575-624

                                              Beaver RA, Maddison PA, 1990. The bark and ambrosia beetles of the Cook Islands and Niue (Coleoptera: Scolytidae and Platypodidae). Journal of Natural History, 24(6):1365-1375; 34 ref

                                              Beeson CFC, 1941. The ecology and control of the forest insects of India and the neighbouring countries. Dehra Dun, India: Published privately, Vasant Press (Copyright: Government of India)

                                              Bright DE, Skidmore RE, 1997. A catalog of Scolytidae and Platypodidae (Coleoptera), Supplement 1 (1990-1994). Ottawa, Canada: NRC Research Press, 368 pp

                                              Bright DE, Skidmore RE, 2002. A catalogue of Scolytidae and Platypodidae (Coleoptera), Supplement 2 (1995-1999). Ottawa, Canada: NRC Research Press, 523 pp

                                              Brockerhoff, E. G., Liebhold, A. M., 2017. Ecology of forest insect invasions. Biological Invasions, 19(11), 3141-3159. doi: 10.1007/s10530-017-1514-1

                                              Browne FG, 1961. The biology of Malayan Scolytidae and Platypodidae. Malayan Forest Records, 22:1-255

                                              Browne FG, 1968. Pests and diseases of forest plantation trees: an annotated list of the principal species occurring in the British Commonwealth. Oxford, UK: Clarendon Press

                                              CABI/EPPO, 2013. Euwallacea fornicatus. [Distribution map]. Distribution Maps of Plant Pests, No.December. Wallingford, UK: CABI, Map 319 (1st revision)

                                              Carrillo, D., Cruz, L. F., Kendra, P. E., Narvaez, T. I., Montgomery, W. S., Monterroso, A., Grave, C. de, Cooperband, M. F., 2016. Distribution, pest status and fungal associates of Euwallacea nr. fornicatus in Florida avocado groves. Insects, 7(4), 55. doi: 10.3390/insects7040055

                                              Carrillo, D., Duncan, R. E., Peña, J. E., 2012. Ambrosia beetles (Coleoptera: Curculionidae: Scolytinae) that breed in avocado wood in Florida. Florida Entomologist, 95(3), 573-579. doi: 10.1653/024.095.0306

                                              Carrillo, D., Duncan, R. E., Ploetz, J. N., Campbell, A. F., Ploetz, R. C., Peña, J. E., 2014. Lateral transfer of a phytopathogenic symbiont among native and exotic ambrosia beetles. Plant Pathology, 63(1), 54-62. doi: 10.1111/ppa.12073

                                              Cooperband, M. F., Stouthamer, R., Carrillo, D., Eskalen, A., Thibault, T., Cossé, A. A., Castrillo, L. A., Vandenberg, J. D., Rugman-Jones, P. F., 2016. Biology of two members of the Euwallacea fornicatus species complex (Coleoptera: Curculionidae: Scolytinae), recently invasive in the U.S.A., reared on an ambrosia beetle artificial diet. Agricultural and Forest Entomology, 18(3), 223-237. doi: 10.1111/afe.12155

                                              Cranham JE, 1966. Tea pests and their control. Annual Review of Entomology, 11:491-514

                                              Danthanarayana W, 1968. The distribution and host-range of the shot-hole borer (Xyleborus fornicatus Eichh.) of tea. Tea Quarterly, 39:61-69

                                              Dodge C, Carrillo J, Eskalen A, Stouthamer R, 2017. Evidence for symbiont promiscuity in two invasive ambrosia beetles (Coleoptera: Scolytinae: Euwallacea spp.). In: Annual Meeting of the Entomological Society of America, 5 November 2017, Denver, CO , USA: Entomological Society of America.165.

                                              Eichhoff WJ, 1868. Neue amerikanische Borkenkafer-Gattung und Arten. Berliner Entomologische Zeitschrift, 12:145-152

                                              EPPO, 2014. PQR database. Paris, France: European and Mediterranean Plant Protection Organization. http://www.eppo.int/DATABASES/pqr/pqr.htm

                                              Eskalen, A., Gonzalez, A., Wang, D. H., Twizeyimana, M., Mayorquin, J. S., Lynch, S. C., 2012. First report of a Fusarium sp. and its vector Tea Shot Hole Borer (Euwallacea fornicatus) causing Fusarium dieback on avocado in California. Plant Disease, 96(7), 1070. doi: 10.1094/PDIS-03-12-0276-PDN

                                              Eskalen, A., Stouthamer, R., Lynch, S. C., Rugman-Jones, P. F., Twizeyimana, M., Gonzalez, A., Thibault, T., 2013. Host range of Fusarium dieback and its ambrosia beetle (Coleoptera: Scolytinae) vector in southern California. Plant Disease, 97(7), 938-951. doi: 10.1094/PDIS-11-12-1026-RE

                                              Fernando EFW, 1960. Storage and transmission of ambrosia fungus in the adult Xyleborus fornicatus Eichhoff. Annals and Magazine of Natural History, 13(2):475-480

                                              Freeman S, Protasov A, Sharon M, Mohotti K, Eliyahu M, Okon-Levy N, Maymon M, Mendel Z, 2012. Obligate feed requirement of Fusarium sp. nov., an avocado wilting agent, by the ambrosia beetle Euwallacea aff. fornicata. Symbiosis [7th International Symbiosis Society Congress, Kraków, Poland, 22-28 July 2012.], 58(1/3):245-251. http://rd.springer.com/article/10.1007/s13199-013-0222-6

                                              Freeman, S., Sharon, M., Maymon, M., Mendel, Z., Protasov, A., Aoki, T., Eskalen, A., O'Donnell, K., 2013. Fusarium euwallaceae sp. nov. - a symbiotic fungus of Euwallacea sp., an invasive ambrosia beetle in Israel and California. Mycologia, 105(6), 1595-1606. doi: 10.3852/13-066

                                              Gadd CH, 1941. Observations on an attack by shot-hole borer of tea. Tea Quarterly, 14:132-146

                                              Gadd CH, Loos CH, 1947. The ambrosia fungus of Xyleborus fornicatus Eichh. Transactions of the British Mycological Society, 30:13-18

                                              Gardner, J. C. M. , 1934. Immature Stages of Indian Coleoptera (15) (Scolytidae). Indian Forest Records, 20(pt. 8), 17 pp.

                                              Gomez, D. F., Lin Wei, Gao Lei, Li You, 2019. New host plant records for the Euwallacea fornicatus (Eichhoff) species complex (Coleoptera: Curculionidae: Scolytinae) across its natural and introduced distribution. Journal of Asia-Pacific Entomology, 22(1), 338-340. doi: 10.1016/j.aspen.2019.01.013

                                              Gomez, D. F., Skelton, J., Steininger, M. S., Stouthamer, R., Rugman-Jones, P., Sittichaya, W, Rabaglia, R. J., Hulcr, J., 2018. Species Delineation Within the Euwallacea fornicatus (Coleoptera: Curculionidae) Complex Revealed by Morphometric and Phylogenetic Analyses. Insect Systematics and Diversity, 2(6), 1-11. doi: 10.1093/isd/ixy018

                                              Grosman, D. M., Eskalen, A., Brownie, C., 2019. Evaluation of emamectin benzoate and propiconazole for management of a new invasive shot hole borer (Euwallacea nr. fornicatus, Coleoptera: Curculionidae) and symbiotic fungi in California sycamores. Journal of Economic Entomology, 112(3), 1267-1273. doi: 10.1093/jee/toy423

                                              Hopkins AD, 1915. Classification of the Cryphalinae with descriptions of new genera and species. United States Department of Agriculture, Report 99:75pp

                                              Hulcr, J., Dole, S. A., Beaver, R. A., Cognato, A. I., 2007. Cladistic review of generic taxonomic characters in Xyleborina (Coleoptera: Curculionidae: Scolytinae). Systematic Entomology, 32(3), 568-584. doi: 10.1111/j.1365-3113.2007.00386.x

                                              Hulcr, J., Mogia, M., Isua, B., Novotny, V., 2007. Host specificity of ambrosia and bark beetles (Col., Curculionidae: Scolytinae and Platypodinae) in a New Guinea rainforest. Ecological Entomology, 32(6), 762-772. doi: 10.1111/j.1365-2311.2007.00939.x

                                              James SP, Babu A, Selvasundaram R, Muraleedharan N, 2007. Field evaluation of traps for attracting shot hole borer. Newsletter - UPASI Tea Research Foundation, 17(1):3

                                              Jayasuriya P, 1979. Performance of clonal selections. United Planters Association of Southern India, Bulletin, 36:12-13

                                              Jones, M. E., Paine, T. D., 2015. Effect of chipping and solarization on emergence and boring activity of a recently introduced ambrosia beetle (Euwallacea sp., Coleoptera: Curculionidae: Scolytinae) in southern California. Journal of Economic Entomology, 108(4), 1852-1859. doi: 10.1093/jee/tov169

                                              Judenko E, 1956. Research work on the shot-hole borer, October, 1955 to August, 1956. Tea Quarterly, 27:103-105

                                              Kalshoven LGE, 1958. Studies on the biology of Indonesian Scolytoidea. I. Xyleborus fornicatus Eichh. as a primary and secondary shot-hole borer in Java and Sumatra. Entomologische Berichten, 18:147-160, 185-193

                                              Kalshoven LGE, Laan PA van der (Reviser and translator), 1981. Pests of crops in Indonesia (revised). Jakarta, Indonesia: Ichtiar Baru, 701 pp

                                              Kasson, M. T., O'Donnell, K., Rooney, A. P., Sink, S., Ploetz, R. C., Ploetz, J. N., Konkol, J. L., Carrillo, D., Freeman, S., Mendel, Z., Smith, J. A., Black, A. W., Hulcr, J., Bateman, C., Stefkova, K., Campbell, P. R., Geering, A. D. W., Dann, E. K., Eskalen, A., Mohotti, K., Short, D. P. G., Aoki, T., Fenstermacher, K. A., Davis, D. D., Geiser, D. M., 2013. An inordinate fondness for Fusarium: phylogenetic diversity of fusaria cultivated by ambrosia beetles in the genus Euwallacea on avocado and other plant hosts. Fungal Genetics and Biology, 56, 147-157. doi: 10.1016/j.fgb.2013.04.004

                                              Kendra, P. E., Owens, D., Montgomery, W. S., Narvaez, T. I., Bauchan, G. R., Schnell, E. Q., Tabanca, N., Carrillo, D., 2017. α-Copaene is an attractant, synergistic with quercivorol, for improved detection of Euwallacea nr. fornicatus (Coleoptera: Curculionidae: Scolytinae). PLoS ONE, 12(6), e0179416. doi: 10.1371/journal.pone.0179416

                                              Kirkendall LR, Ødegaard F, 2007. Ongoing invasions of old-growth tropical forests: Establishment of three incestuous beetle species in Central America (Curculionidae, Scolytinae). Zootaxa, 1588, 53-62.

                                              Kumar NS, Priyadarshine Hewavitharanage, Adikaram NKB, 1995. Attack on tea by Xyleborus fornicatus: inhibition of the symbiote, Monacrosporium ambrosium, by caffeine. Phytochemistry, 40(4):1113-1116; 11 ref

                                              Kühnholz S, Borden JH, Uzunovic A, 2003. Secondary ambrosia beetles in apparently healthy trees: adaptations, potential causes and suggested research. Integrated Pest Management Reviews, 6:209-219

                                              Li You, Gu XinYao, Kasson, M. T., Bateman, C. C., Guo JianJun, Huang YinTse, Li Qiao, Rabaglia, R. J., Hulcr, J., 2016. Distribution, host records, and symbiotic fungi of Euwallacea fornicatus (Coleoptera: Curculionidae: Scolytinae) in China. Florida Entomologist, 99(4), 801-804. http://www.bioone.org/loi/flen

                                              Mathew G, 1985. Insects associated with forest plantations of Gmelina arborea Roxb. in Kerala, India. Indian Journal of Forestry, 9:308-312

                                              Mathew G, Nair KSS, 1986. Insects associated with forest plantations of Paraserianthes falcataria in Kerala, India. Malaysian Forester, 48:200-205

                                              Mendel, Z., Protasov, A., Sharon, M., Zveibil, A., Yehuda, S. B., O'Donnell, K., Rabaglia, R., Wysoki, M., Freeman, S., 2012. An Asian ambrosia beetle Euwallacea fornicatus and its novel symbiotic fungus Fusarium sp. pose a serious threat to the Israeli avocado industry. Phytoparasitica, 40(3), 235-238. doi: 10.1007/s12600-012-0223-7

                                              Mote UN, Tambe AB, 1990. Insecticidal control of shot-hole borer, Xyleborus fornicatus Eichhoff on pomegranate. Plant Protection Bulletin (Faridabad), 42(1-2):9-12

                                              Mote UN, Tambe AB, 1991. Observations on extent of damage caused by shot-hole borer on pomegranate and castor. Journal of Maharashtra Agricultural Universities, 16(3):439-440

                                              Mote UN, Tambe AB, 2000. Effective and economic management of shot-hole borer on pomegranate. Journal of Maharashtra Agricultural Universities, 25(2):155-157; 7 ref

                                              Mote UN, Tambe AB, 2000. Seasonal incidence of shot-hole borer on pomegranate. Journal of Maharashtra Agricultural Universities, 25(1):34-36; 12 ref

                                              Mouli BC, Kumar PR, 1988. Fungi occurring on tea and Grevillea robusta in tea plantations of Southern India. Indian Phytopathology, 41(3):503

                                              Muraleedharan N, 1986. The shot-hole borer of tea: its biology, ecology and control. UPASI Handbook of Tea Culture, Series 19:4pp

                                              Muraleedharan N, 1995. Strategies for the management of shot-hole borer. Planters' Chronicle, January:23-24

                                              Muraleedharan N, Entomology. Annual report for the period 1st January 1981 to 31st December 1981, Tea Scientific Department, United Planters' Association of Southern India India, Cinchona; United Planters' Association of Southern India, 88-104

                                              Muraleedharan N, Radhakrishnan B, 1994. Chemical control of Euwallacea fornicatus (Eichhoff) (Scolytidae: Coleoptera), the shot-hole borer of tea. Journal of Plantation Crops, 22(1):47-49

                                              Muraleedharan N, Radhakrishnan B, Selvasundaram R, 1992. Shot hole borer of tea - evaluation of insecticides. Planters' Chronicle, February:79

                                              Muraleedharan N, Selvasundaram R, Radhakrishnan B, 1988. Natural enemies of certain tea pests occurring in southern India. Insect Science and its Application, 9(5):647-654

                                              Muraleedharan N, Selvasundaram R, Sudarmani DNP, 2003. Incidence of shot hole borer in relation to time of pruning and length of pruning cycle. Annual Report UPASI Tea Research Foundation, 76:3

                                              Nair KSS, Mathew G, 1988. Biology and control of insect pests of fast-growing hardwood species (Final Report of the Research Project Entom 05/77, March 1977 to February 1982). 1. Albizia falcataria and Gmelina arborea. KFRI Research Report, No. 51 (Summary):ii + 8 pp

                                              O'Donnell, K., Sink, S., Libeskind-Hadas, R., Hulcr, J., Kasson, M. T., Ploetz, R. C., Konkol, J. L., Ploetz, J. N., Carrillo, D., Campbell, A., Duncan, R. E., Liyanage, P. N. H., Eskalen, A., Na, F., Geiser, D. M., Bateman, C., Freeman, S., Mendel, Z., Sharon, M., Aoki, T., Cossé, A. A., Rooney, A. P., 2015. Discordant phylogenies suggest repeated host shifts in the Fusarium-Euwallacea ambrosia beetle mutualism. Fungal Genetics and Biology, 82, 277-290. doi: 10.1016/j.fgb.2014.10.014

                                              Owens, D., Cruz, L. F., Montgomery, W. S., Narvaez, T. I., Schnell, E. Q., Tabanca, N., Duncan, R. E., Carrillo, D., Kendra, P. E., 2018. Host range expansion and increasing damage potential of Euwallacea nr. fornicatus (Coleoptera: Curculionidae) in Florida. Florida Entomologist, 101(2), 229-236. doi: 10.1653/024.101.0212

                                              Owens, D., Kendra, P. E., Tabanca, N., Narvaez, T. I., Montgomery, W. S., Schnell, E. Q., Carrillo, D., 2019. Quantitative analysis of contents and volatile emissions from α-copaene and quercivorol lures, and longevity for attraction of Euwallacea nr. fornicatus in Florida. Journal of Pest Science, 92(1), 237-252. doi: 10.1007/s10340-018-0960-6

                                              Owens, D., Seo MeeJa, Montgomery, W. S., Rivera, M. J., Stelinski, L. L., Kendra, P. E., 2019. Dispersal behaviour of Euwallacea nr. fornicatus (Coleoptera: Curculionidae: Scolytinae) in avocado groves and estimation of lure sampling range. Agricultural and Forest Entomology, 21(2), 199-208. doi: 10.1111/afe.12321

                                              Portsmouth GB, 1956. The shot-hole borer problem. Tea Quarterly, 27:92-96

                                              Rabaglia, R. J., Dole, S. A., Cognato, A. I., 2006. Review of American Xyleborina (Coleoptera: Curculionidae: Scolytinae) occurring North of Mexico, with an illustrated key. Annals of the Entomological Society of America, 99(6), 1034-1056. doi: 10.1603/0013-8746(2006)99[1034:ROAXCC]2.0.CO;2

                                              Rajesh Kumar, Girin Rajkhowa, Mattipalli Sankar, Rajan RK, 2011. A new host plant for the shoot-hole borer, Euwallacea fornicatus (Eichhoff) (Coleoptera: Scolytidae) from India. Acta Entomologica Sinica, 54(6):734-738. http://www.insect.org.cn/EN/volumn/current.shtml

                                              Ranasinghe MASK, Wickremasinghe RL, 1988. Use of acetates to induce host resistance to Xyleborus fornicatus (Coleoptera: Scolytidae) attacking tea. Brighton Crop Protection Conference, Pests and Diseases Thornton Heath, UK; British Crop Protection Council, No. 1:251-256

                                              Rao GN, 1979. Shot-hole borer problems and recent developments in its control. United Planters Association of Southern India, Bulletin 36:18-22

                                              Samuelson GA, 1981. A synopsis of Hawaiian Xyleborini (Coleoptera: Scolytidae). Pacific Insects, 23(1/2):50-92

                                              Schedl KE, 1959. A check list of the Scolytidae and Platypodidae (Coleoptera) of Ceylon with descriptions of new species and biological notes. Transactions of the Royal Entomological Society of London, 111(15), 469-516.

                                              Schedl KE, 1977. Die Scolytidae und Platypodidae Madagaskars und einger naheliegender Inselgruppen. Mitteilungen der Forstlichen Bundes-Versuchsanstalt, Wien, 119:1-326

                                              Selvasundaram R, Muraleedharan N, 2000. Occurrence of the entomogenous fungus Beauveria bassiana on the shot hole borer of tea. Journal of Plantation Crops, 28(3):229-230; 2 ref

                                              Selvasundaram R, Muraleedharan N, Sudarmani DNP, 2001. Lambdacyhalothrin for mid-cycle control of shot hole borer. Newsletter - UPASI Tea Research Foundation, 11(2):3

                                              Sittichaya, W., Permkam, S., Cognato, A. I., 2012. Species composition and flight pattern of Xyleborini ambrosia beetles (Col.: Curculionidae: Scolytinae) from agricultural areas in southern Thailand. Environmental Entomology, 41(4), 776-784. doi: 10.1603/EN11271

                                              Sivapalan P, 1975. The dispersion of brood galleries of Xyleborus fornicatus Eichh. (Coleoptera, Scolytidae) in tea plants. Bulletin of Entomological Research, 65(3):501-506

                                              Sivapalan P, 1977. Population dynamics of Xyleborus fornicatus Eichhoff (Coleoptera: Scolytidae) in relation to yield trends in tea. Bulletin of Entomological Research, 67(2):329-335

                                              Sivapalan P, Delucchi V, 1974. Integrated approach in tea pest control in Sri Lanka. Proceedings of the FAO Conference on Ecology in relation to Plant Pest Control, Rome, Italy, 11-15 December, 1972. Rome, Italy: Food and Agriculture Organization, 183-196

                                              Smith, S. M., Gomez, D. F., Beaver, R. A., Hulcr, J., Cognato, A. I., 2019. Reassessment of the species in the Euwallacea fornicatus (Coleoptera: Curculionidae: Scolytinae) complex after the rediscovery of the "lost" type specimen. Insects, 10(9), doi: 10.3390/insects10090261

                                              Somasekhara YM, Wali SY, 2000. Survey of incidence of pomegranate (Punica granatum Linn) wilt (Ceratocystis fimbriata Ell & Halst). Orissa Journal of Horticulture, 28(2):84-89; 9 ref

                                              Somasekhara YM, Wali SY, Bagali AN, 2000. Ceratocystis fimbriata - a threatening pathogen of pomegranate (Punica granatum Linn.) in northern Karnataka. Research on Crops, 1(1):63-66; 9 ref

                                              Speyer ER, 1923. Notes upon the habits of Ceylonese ambrosia beetles. Bulletin of Entomological Research, 14:11-23

                                              Speyer, E. E. , 1917. Tea Diseases. The Shot-hole Borer Investigation. Trop. Agric., Peradeniya, 48(3), 152-155.

                                              Stouthamer, R., Rugman-Jones, P., Thu, P. Q., Eskalen, A., Thibault, T., Hulcr, J., Wang LiangJong, Jordal, B. H., Chen ChiYu, Cooperband, M., Lin ChingShan, Kamata, N., Lu ShengShan, Masuya, H., Mendel, Z., Rabaglia, R., Sanguansub, S., Shih HsinHui, Sittichaya, W., Zong ShiXiang, 2017. Tracing the origin of a cryptic invader: phylogeography of the Euwallacea fornicatus (Coleoptera: Curculionidae: Scolytinae) species complex. Agricultural and Forest Entomology, 19(4), 366-375. doi: 10.1111/afe.12215

                                              Thirugnanasuntharan K, Jayachandran ICR, 1989. Recent observations on resistance and susceptibility of tea clones to the shot-hole borer beetle, Xyleborus fornicatus Eichh. (Coleoptera: Scolytidae). Sri Lanka Journal of Tea Science, 58(1):50-55

                                              UPASI Tea Research Foundation, 2003. Field evaluation of Beauveria bassiana against shot hole borer, Annual Report UPASI Tea Research Foundation, 76:48-49

                                              UPASI Tea Research Foundation, 2003. Shot hole borer: Euwallacea fornicatus (Scolytidae: Coleoptera). www.upasitearesearch.org/pestmanagement_content.html

                                              Walgama RS, Zalucki MP, 2007. Temperature-dependent development of Xyleborus fornicatus (Coleoptera: Scolytidae), the shot-hole borer of tea in Sri Lanka: implications for distribution and abundance. Insect Science, 14(4):301-308. http://www.blackwell-synergy.com/loi/ins

                                              Waterhouse DF, 1993. The Major Arthropod Pests and Weeds of Agriculture in Southeast Asia. ACIAR Monograph No. 21. Canberra, Australia: Australian Centre for International Agricultural Research, 141 pp

                                              Wickremasinghe RL, Thirugnanasuntheram K, 1980. Biochemical approach to the control of Xyleborus fornicatus (Coleoptera, Scolytidae). Plant and Soil, 55(1):9-15

                                              Wood SL, 1980. New American bark beetles (Coleoptera: Scolytidae), with two recently introduced species. Great Basin Naturalist, 40(4):353-358

                                              Wood SL, 1980. New genera and new generic synonymy in Scolytidae (Coleoptera). Great Basin Naturalist, 40(1):89-97

                                              Wood SL, 1986. A reclassification of the genera of Scolytidae (Coleoptera). Great Basin Naturalist Memoirs, No. 10:126pp

                                              Wood SL, 1989. Nomenclatural changes and new species of Scolytidae (Coleoptera), Part IV. Great Basin Naturalist, 49(2):167-185

                                              Wood SL, Bright DE, 1992. A catalog of Scolytidae and Platypodidae (Coleoptera), Part 2: Taxonomic index. Great Basin Naturalist Memoirs, 13: 1-1553

                                              Yamaguchi T, Iwamoto J, Goto H, Nojima H, Omatu N, Torigoe H, Yasuda K, Setokuchi O, Hayashikawa S, 2006. Insect pests of the mango plant, Mangifera indica, on the Amami islands, Japan. Kyushu Plant Protection Research, 52:60-65

                                              Yin H-F, Huang F-S, 1981. Coleoptera: Scolytidae. Insects of Xizang, 1:555-570

                                              Yin H-F, Huang F-S, Li Z-L, 1984. Economic Insect Fauna of China. Fasc. 29. Coleoptera: Scolytidae. Beijing, China: Science Press

                                              Distribution References

                                              APPPC, 1987. Insect pests of economic significance affecting major crops of the countries in Asia and the Pacific region. Technical Document No. 135., Bangkok, Thailand: Regional Office for Asia and the Pacific region (RAPA).

                                              Beaver R A, 1990. New records and new species of bark and ambrosia beetles from Thailand (Coleoptera; Scolytidae and Platypodidae). Deutsche Entomologische Zeitschrift. 37 (4-5), 279-284. DOI:10.1002/mmnd.19900370408

                                              Beaver R A, Liu L Y, 2010. An annotated synopsis of Taiwanese bark and ambrosia beetles, with new synonymy, new combinations and new records (Coleoptera: Curculionidae: Scolytinae). Zootaxa. 1-47. http://www.mapress.com/zootaxa/2010/f/z02602p047f.pdf

                                              CABI, EPPO, 2013. Euwallacea fornicatus. [Distribution map]. In: Distribution Maps of Plant Pests, Wallingford, UK: CABI. Map 319 (1st revisio. DOI:10.1079/DMPP/20143031649

                                              CABI, Undated. Compendium record. Wallingford, UK: CABI

                                              CABI, Undated a. CABI Compendium: Status as determined by CABI editor. Wallingford, UK: CABI

                                              Carrillo D, Duncan R E, Peña J E, 2012. Ambrosia beetles (Coleoptera: Curculionidae: Scolytinae) that breed in avocado wood in Florida. Florida Entomologist. 95 (3), 573-579. http://www.fcla.edu/FlaEnt/ DOI:10.1653/024.095.0306

                                              EPPO, 2020. EPPO Global database. In: EPPO Global database, Paris, France: EPPO. https://gd.eppo.int/

                                              Eskalen A, Gonzalez A, Wang D H, Twizeyimana M, Mayorquin J S, Lynch S C, 2012. First report of a Fusarium sp. and its vector Tea Shot Hole Borer (Euwallacea fornicatus) causing Fusarium dieback on avocado in California. Plant Disease. 96 (7), 1070. DOI:10.1094/PDIS-03-12-0276-PDN

                                              Gomez D F, Skelton J, Steininger M S, Stouthamer R, Rugman-Jones P, Sittichaya W, Rabaglia R J, Hulcr J, 2018. Species delineation within the Euwallacea fornicatus (Coleoptera: Curculionidae) complex revealed by morphometric and phylogenetic analyses. Insect Systematics and Diversity. 2 (6), DOI:10.1093/isd/ixy018

                                              Kirkendall L R, Ødegaard F, 2007. Ongoing invasions of old-growth tropical forests: establishment of three incestuous beetle species in southern Central America (Curculionidae: Scolytinae). Zootaxa. 53-62. https://www.mapress.com/zootaxa/2007f/zt01588p062.pdf

                                              Mitchell A, Maddox C, 2010. Bark beetles (Coleoptera: Curculionidae: Scolytinae) of importance to the Australian macadamia industry: an integrative taxonomic approach to species diagnostics. Australian Journal of Entomology. 49 (2), 104-113. DOI:10.1111/j.1440-6055.2010.00746.x

                                              Nair K S S, Mathew G, 1988. Biology and control of insect pests of fast-growing hardwood species (Final Report of the Research Project Entom 05/77, March 1977 to February 1982). 1. Albizia falcataria and Gmelina arborea. In: KFRI Research Report, Peechi, India: Kerala Forest Research Institute. ii + 8 pp.

                                              Rajesh Kumar, Girin Rajkhowa, Mattipalli Sankar, Rajan R K, 2011. A new host plant for the shoot-hole borer, Euwallacea fornicatus (Eichhoff) (Coleoptera: Scolytidae) from India. Acta Entomologica Sinica. 54 (6), 734-738. http://www.insect.org.cn/EN/volumn/current.shtml

                                              Schedl K E, 1959. A Check List of the Scolytidae and Platypodidae (Coleoptera) of Ceylon with Descriptions of New Species and Biological Notes. Transactions of the Royal Entomological Society of London. 111 (15), 469-534. DOI:10.1111/j.1365-2311.1959.tb02874.x

                                              Smith S M, Gomez D F, Beaver R A, Hulcr J, Cognato A I, 2019. Reassessment of the species in the Euwallacea fornicatus (Coleoptera: Curculionidae: Scolytinae) complex after the rediscovery of the "lost" type specimen. Insects. 10 (9), DOI:10.3390/insects10090261

                                              Stouthamer R, Rugman-Jones P, Thu P Q, Eskalen A, Thibault T, Hulcr J, Wang LiangJong, Jordal B H, Chen ChiYu, Cooperband M, Lin ChingShan, Kamata N, Lu ShengShan, Masuya H, Mendel Z, Rabaglia R, Sanguansub S, Shih HsinHui, Sittichaya W, Zong ShiXiang, 2017. Tracing the origin of a cryptic invader: phylogeography of the Euwallacea fornicatus (Coleoptera: Curculionidae: Scolytinae) species complex. Agricultural and Forest Entomology. 19 (4), 366-375. DOI:10.1111/afe.12215

                                              Swezey O H, 1950. Notes on the life cycle of certain introduced cerambycid beetles. [Proceedings, Hawaiian Entomological Society], 14 (1) USA: Hawaiian Entomological Society. 187-188. https://scholarspace.manoa.hawaii.edu/bitstream/10125/16223/1/PHES14_187-188.pdf

                                              Thomas M C, 2007. Pest Alert - Two Asian ambrosia beetles recently established in Florida (Curculionidae: Scolytinae). In: Pest Alert - Two Asian ambrosia beetles recently established in Florida (Curculionidae: Scolytinae), Florida Department of Agriculture & Consumer Services - Division of Plant Industry. http://www.doacs.state.fl.us/pi/enpp/ento/twonewxyleborines.html

                                              Waterhouse D F, 1993. The major arthropod pests and weeds of agriculture in Southeast Asia. Canberra, Australia: ACIAR. v + 141 pp.

                                              Wood S L, 1980. New genera and new generic synonymy in Scolytidae (Coleoptera). Great Basin Naturalist. 40 (1), 89-97.

                                              Wood SL, Bright DE, 1992. A catalog of Scolytidae and Platypodidae (Coleoptera), Part 2: Taxonomic index. In: Great Basin Naturalist Memoirs, 13 1-1553.

                                              Contributors

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                                              08/08/19 Original text by:

                                              Demian F. Gomez, School of Forest Resources and Conservation, University of Florida, USA

                                              Andrew J. Johnson, University of Florida, USA

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