Platypus quercivorus (oak ambrosia beetle)
- Taxonomic Tree
- Notes on Taxonomy and Nomenclature
- Distribution Table
- Risk of Introduction
- Hosts/Species Affected
- Host Plants and Other Plants Affected
- Growth Stages
- List of Symptoms/Signs
- Biology and Ecology
- Notes on Natural Enemies
- Plant Trade
- Wood Packaging
- Environmental Impact
- Detection and Inspection
- Similarities to Other Species/Conditions
- Prevention and Control
- Distribution Maps
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PicturesTop of page
IdentityTop of page
Preferred Scientific Name
- Platypus quercivorus (Murayama, 1925)
Preferred Common Name
- oak ambrosia beetle
Other Scientific Names
- Crossotarsus quercivorus Murayama, 1925
- Crossotarsus sexfenestratus Beeson, 1937
Taxonomic TreeTop of page
- Domain: Eukaryota
- Kingdom: Metazoa
- Phylum: Arthropoda
- Subphylum: Uniramia
- Class: Insecta
- Order: Coleoptera
- Family: Platypodidae
- Genus: Platypus
- Species: Platypus quercivorus
Notes on Taxonomy and NomenclatureTop of page
DescriptionTop of page
The eggs are elongated and cylindrical.
The larvae are variable in size and range from 2-6 mm long when mature. They are legless and creamy-white, with an amber to light-brown head capsule. The last abdominal segment ends in a flat to slightly concave declivity.
The pupae are creamy-white and have partially developed wings and appendages.
The adults of the genus Platypus are reddish-brown to dark-brown with a cylindrical, elongated body that averages 5 mm long. These insects have a concave elytral declivity armed with spines. The front (prothoracic) legs are adapted for excavation.
DistributionTop of page
Distribution TableTop of page
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: 17 Feb 2021
|Continent/Country/Region||Distribution||Last Reported||Origin||First Reported||Invasive||Reference||Notes|
|-Ryukyu Islands||Present, Widespread||Native||Invasive|
|Papua New Guinea||Present||Native|
Risk of IntroductionTop of page
HabitatTop of page
Hosts/Species AffectedTop of page
Host Plants and Other Plants AffectedTop of page
|Castanea crenata (Japanese chestnut)||Fagaceae||Unknown|
|Castanopsis cuspidata (chinkapin)||Fagaceae||Main|
|Cryptomeria japonica (Japanese cedar)||Taxodiaceae||Main|
|Prunus (stone fruit)||Rosaceae||Main|
|Quercus acuta (japanese evergreen oak)||Fagaceae||Main|
|Quercus acutissima (sawtooth oak)||Fagaceae||Main|
|Quercus glauca (ring-cup oak)||Fagaceae||Main|
|Quercus laurifolia (Laurel oak)||Fagaceae||Unknown|
|Quercus mongolica (Mongolian oak)||Fagaceae||Main|
|Quercus phillyraeoides (ubame oak)||Fagaceae||Main|
|Quercus robur (common oak)||Fagaceae||Unknown|
|Quercus serrata (glandbearing oak)||Fagaceae||Main|
Growth StagesTop of page
SymptomsTop of page
List of Symptoms/SignsTop of page
|Leaves / wilting|
|Leaves / yellowed or dead|
|Stems / internal discoloration|
|Stems / visible frass|
|Whole plant / frass visible|
|Whole plant / plant dead; dieback|
Biology and EcologyTop of page
Members of the genus Platypus are ambrosia beetles and breed in the wood of host trees. White splinters are produced during gallery construction as opposed to fine sawdust, which is produced by other ambrosia beetles. Also, unlike other ambrosia beetles, the galleries of Platypus spp. often penetrate into the heartwood. The larvae and adults feed on ambrosia fungi, which are stored and disseminated by the adult female. The fungal associates of several species of Platypus are members of the genus Raffaelea. In western North America, the ambrosia fungus associated with Platypus wilsoni is Raffaelea canadensis (Furniss and Carolin, 1977). In Argentina, Raffaelea santoroi is associated with Platypus mutatus (Giménez and Etiennot, 2003). In Europe, Raffaelea ambrosiae is associated with the oak ambrosia beetle, Platypus cylindrus (Babuder and Pohleven, 1995).
Adult ambrosia beetles vector their associated ambrosia fungi via structures known as mycangia, which store fungal spores. In the family Platypodidae, if mycangia are present, they are simple; usually small pits or notches in the integument. These structures are often present only on the females although the males typically initiate the attacks. For example, in the case of Platypus hintzi the mycangia consist of a pair of small hollows on the pronotum. In contrast, P. wilsoni has numerous small punctures on the pronotum (Cook, 1977). Ito et al. (2004) suggested that P. quercivorus has mycangia similar to P. hintzi.
Male P. quercivorus initiate the attacks on the boles of host trees and excavate galleries for mating from June to October (Soné et al., 2000). Apparently the first entry holes bored by male beetles trigger a mass attack (Kobayashi and Ueda, 2003). The attacks generally occur near ground level (Hijii et al., 1991). A single female joins the male and constructs the oviposition gallery after mating. This is kept clean by the male who expels the residues to the outside of the tree. During gallery construction, the females inoculate the gallery surface with spores of the ambrosia fungus, which the larvae feed on. The adult females begin to deposit eggs at the terminal parts of the tunnels, 2 to 3 weeks after gallery construction begins. The eggs are deposited in individual niches. An average of 50 to 60 larvae develop in a single gallery system but the number of larvae can be as high as 161. The larvae feed on the ambrosia fungus that develops on the walls of the galleries. Pupation occurs in the larval galleries. The majority of new adults leave their maternal galleries in September and October but some adults remain in the galleries until the spring and then die. In other cases the larvae reach the fifth-instar by late November and overwinter in pupal chambers. Pupation begins in the following May and the adults emerge in June and July. They emerge through entry holes made by the parents (Soné et al., 1998).
In Japan, Quercus mongolica and Quercus serrata that are mass-attacked by P. quercivorus, are usually killed later in the summer. Two fungi have been recovered from trees attacked by this insect and described as new species. Ophiostoma longicollum was described from Q. mongolica infested by P. quercivorus in 1998 (Masuya et al., 1998). The fungus, Raffaelea quercivora was isolated from discoloured sapwood, necrotic inner bark, the body surfaces of beetles, female beetle's mycangia and beetle galleries of symptomatic trees in 2002. Inoculation tests indicated that R. quercivora is the causal agent of Japanese oak disease and P. quercivorus is its vector. This is the first known occurrence of mass-mortality of trees in the family Fagaceae, caused by a species of Platypus and an associated ambrosia fungus of the genus Raffaelea (Ito et al., unda).
Notes on Natural EnemiesTop of page
Plant TradeTop of page
|Plant parts liable to carry the pest in trade/transport||Pest stages||Borne internally||Borne externally||Visibility of pest or symptoms|
|Stems (above ground)/Shoots/Trunks/Branches||adults; eggs; larvae; nymphs; pupae||Yes||Pest or symptoms usually visible to the naked eye|
|Plant parts not known to carry the pest in trade/transport|
|Fruits (inc. pods)|
|Growing medium accompanying plants|
|True seeds (inc. grain)|
Wood PackagingTop of page
|Wood Packaging liable to carry the pest in trade/transport||Timber type||Used as packing|
|Solid wood packing material with bark||Oak: pallets, crating dunnage||Yes|
|Solid wood packing material without bark||Oak: pallets, crating dunnage||Yes|
|Wood Packaging not known to carry the pest in trade/transport|
|Loose wood packing material|
|Processed or treated wood|
ImpactTop of page
Since the early 1980s, extensive mortality of oak forests has been reported from western Japan (Kaneko, 1995). This condition, referred to as Japanese oak disease, is now attributed to the fungus Raffaelea quercivora, an anamorphic Ascomycete, which is a fungal associate of P. quercivorus (Ito et al., unda). The mortality of oak trees, at a rate of more than 200,000 per year, has been observed in the western coastal areas of Honshu, Japan (EPPO, 2003). The deciduous species of oaks, Quercus serrata and Quercus mongolica are susceptible to the disease. Other trees of the family Fagaceae that are present in the area, e.g. Quercus acutissima, Quercus acuta, Quercus phillyraeoides and Castanopsis sieboldii, are apparently not affected by the fungus (Ito et al., unda). To date, the most severe tree mortality has occurred on the west coast of Honshu (Hamaguchi and Goto, 2003).
It has been postulated that oaks, which are resistant or tolerant to Raffaelea quercivora, co-evolved under a stable relationship between the tree, fungus and beetle during a long evolutionary process. Q. mongolica may not have been part of this co-evolution. This hypothesis is supported by the fact that P. quercivorus has the least preference for Q. mongolica but exhibits the highest reproductive success in this species. Therefore, P. quercivorus could spread more rapidly in stands with a high composition of Q. mongolica. The present oak dieback epidemic in Japan may have resulted from the warmer climate that began in the late 1980s. This facilitated the encounter of P. quercivorus and Q. mongolica, by allowing the beetle to extend its range to more northerly latitudes and higher altitudes (Kamata et al., 2002).
Environmental ImpactTop of page
Detection and InspectionTop of page
Similarities to Other Species/ConditionsTop of page
Prevention and ControlTop of page
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.The management of Platypus spp. beetles includes the application of contact insecticide sprays to the bark of high value trees to prevent attack. Systemic insecticides can be applied to the soil or bark of infested trees. Attacks in harvested logs can be prevented by the timely removal of them from forested areas and rapid processing or debarking at the sawmill (Cibrián Tovar et al., 1995).
Pest management methods that are designed to reduce the rate of oak mortality caused by the combination of P. quercivorus and Raffaelea quercivora are being developed in Japan. Recent studies indicated that both P. quercivorus and its associated fungus can be controlled by the injection of NCS [metam-ammonium] (N-methyldithiocarbamate) into holes bored in the stems of host trees (Weng PuJin et al., 2000).
ReferencesTop of page
Beaver RA; Hsien-Tzung Shih, 2003. Checklist of Platypodidae (Coleoptera: Curculionoidea) from Taiwan. Plant Protection Bulletin 45:75-90.
Bright DE; Skidmore RE, 2002. A catalogue of Scolytidae and Platypodidae (Coleoptera), Supplement 2 (1995-1999). Ottawa, Canada: NRC Research Press, 523 pp.
Cibrián Tovar D; Méndez Montiel JT; Campos Bolaños R; Yates III HO; Flores Lara JE, 1995. Forest Insects of Mexico. Chapingo, México: Universidad Autonoma Chapingo. Subsecretaria Forestal y de Fauna Silvestre de la Secretaria de Agricultura y Recursos Hidraulicos, México. United States Department of Agriculture, Forest Service, USA. Natural Resources Canada, Canada. North American Forestry Commission, FAO, Publication 6.
Cook R, 1977. The biology of symbiotic fungi. London, UK: John Wiley and Sons.
Drooz AT, 1985. Insects of eastern forests. USDA Forest Service, Miscellaneous Publication 1339.
Endoh, R., Suzuki, M., Okada, G., Takeuchi, Y., Futai, K., 2011. Fungus symbionts colonizing the galleries of the ambrosia beetle Platypus quercivorus. Microbial Ecology, 62(1), 106-120. doi: 10.1007/s00248-011-9838-3
EPPO, 2003. Raffaelea quercivora (a lethal disease of oak in Japan). www.eppo.org/QUARANTINE/Alert_List/ Fungi/raffaelea.html.
EPPO, 2014. PQR database. Paris, France: European and Mediterranean Plant Protection Organization. http://www.eppo.int/DATABASES/pqr/pqr.htm
Esaki, K., 2008. Control effects of the oak borer Platypus quercivorus (Coleoptera: Platypodidae) by spraying trunk surface with fenitrothion. Journal of the Japanese Forest Society, 90(6), 391-396. doi: 10.4005/jjfs.90.391
Esaki, K., 2011. Field management of the oak borer Platypus quercivorus (Coleoptera: Platypodidae) by spraying trunk surface with fenitrothion twice. Journal of the Japanese Forest Society, 93(2), 58-63. doi: 10.4005/jjfs.93.58
Esaki, K., Kato, K., Kamata, N., 2004. Stand-level distribution and movement of Platypus quercivorus adults and patterns of incidence of new infestation. Agricultural and Forest Entomology, 6(1), 71-82. doi: 10.1111/j.1461-9563.2004.00206.x
Furniss RL; Carolin VM, 1977. Western Forest Insects. Washington DC, USA: US Department of Agriculture Forest Service, Miscellaneous Publication No. 1339.
Giménez RA; Etiennot RE, 2003. Host range of Platypus mutatus (Chapois, 1865) (Coleoptera: Platypodidae). Entomotropica, 18(2):89-94.
Hamaguchi K; Goto H, 2003. Molecular phylogenic relationships among populations of the ambrosia beetle, Platypus quercivorus, the vector insect of Japanese oak disease. Display Presentation D0321, Entomological Society of America, National Meeting, Cincinnati, Ohio, 28 October 2003.
Hijii N; Kajimura H; Urano T; Kinuura H; Itami H, 1991. The mass mortality of oak trees induced by Platypus quercivorus (Murayama) and Platypus calamus Blandford (Coleoptera: Platypodidae). The density and spatial distribution of attack by the beetles. Journal of the Japanese Forestry Society, 73(6):471-476
Ito S; Murata M; Kubono T; Yamada T, unda. Pathogenicity of Raffaelea quercivora associated with mass mortality of facaceous trees in Japan. Poster presentation, MIE University, Kamihamcho, Japan. On line: http://www.forestresearch.co.nz/PDF/11.20Itoetal.pdf.
Kamata N; Esaki K; Kato K; Igeta Y; Wada K, 2002. Potential impact of global warming on deciduous oak dieback caused by ambrosia fungus Raffaelea sp. carried by ambrosia beetle Platypus quercivorus (Coleoptera: Platypodidae) in Japan. Bulletin of Entomological Research, 92(2):119-126; 49 ref.
Kaneko S, 1995. Mass death of oaks in Japan. Paper presented at the IUFRO XX World Congress, 6-12 August 1995, Tampere, Finland.
Kobayashi M; Ueda A, 2003. Observation of mass attack and artificial reproduction in Platypus quercivorus (Murayama) (Coleoptera: Platypodidae). Japanese Journal of Applied Entomology and Zoology, 47(2):53-60.
Kuroda K; Yamada T, 1996. Discoloration of sapwood and blockage of xylem sap ascent in the trunks of wilting Quercus spp. following attack by Platypus quercivorus. Journal of the Japanese Forestry Society, 78(1):84-88; [With English figures and tables]; 17 ref.
Qi HongYe, Wang JianGuo, Endoh, R., Takeuchi, Y., Tarno, H., Futai, K., 2011. Pathogenicity of microorganisms isolated from the oak platypodid, Platypus quercivorus (Murayama) (Coleoptera: Platypodidae). Applied Entomology and Zoology, 46(2), 201-210. doi: 10.1007/s13355-011-0032-3
Soné K; Uto K; Fukuyama S; Nagano T, 2000. Effects of attack time on the development and reproduction of the oak borer, Platypus quercivorus (Murayama). Japanese Journal of Applied Entomology and Zoology, 44(3):189-196; 13 ref.
Tarno, H., Qi HongYe, Endoh, R., Kobayashi, M., Goto, H., Futai, K., 2011. Types of frass produced by the ambrosia beetle Platypus quercivorus during gallery construction, and host suitability of five tree species for the beetle. Journal of Forest Research, 16(1), 68-75. doi: 10.1007/s10310-010-0211-z
Wood SL, Bright Jr. DE, 1992. A catalog of Scolytidae and Platypodidae (Coleoptera), Part 2: Taxonomic Index. Provo, Utah, USA: Bringham Young University, Great Basin Naturalist Memoir No. 13.
Endoh R, Suzuki M, Okada G, Takeuchi Y, Futai K, 2011. Fungus symbionts colonizing the galleries of the ambrosia beetle Platypus quercivorus. Microbial Ecology. 62 (1), 106-120. http://www.springerlink.com/content/n7x1210m42815l31/fulltext.html DOI:10.1007/s00248-011-9838-3
Esaki K, Kato K, Kamata N, 2004. Stand-level distribution and movement of Platypus quercivorus adults and patterns of incidence of new infestation. Agricultural and Forest Entomology. 6 (1), 71-82. DOI:10.1111/j.1461-9563.2004.00206.x
Hamaguchi K, Goto H, 2003. Molecular phylogenic relationships among populations of the ambrosia beetle, Platypus quercivorus, the vector insect of Japanese oak disease. In: Display Presentation D0321, Entomological Society of America, National Meeting, Cincinnati, Ohio, 28 October 2003,
Kamata N, Esaki K, Mori K, Takemoto H, Mitsunaga T, Honda H, 2008. Field trap test for bioassay of synthetic (1S,4R)-4-isopropyl-1-methyl-2-cyclohexen-1-ol as an aggregation pheromone of Platypus quercivorus (Coleoptera: Platipodidae). Journal of Forest Research. 13 (2), 122-126. DOI:10.1007/s10310-007-0053-5
Kinuura H, Kobayashi M, 2006. Death of Quercus crispula by inoculation with adult Platypus quercivorus (Coleoptera: Platypodidae). Applied Entomology and Zoology. 41 (1), 123-128. DOI:10.1303/aez.2006.123
Qi HongYe, Wang JianGuo, Endoh R, Takeuchi Y, Tarno H, Futai K, 2011. Pathogenicity of microorganisms isolated from the oak platypodid, Platypus quercivorus (Murayama) (Coleoptera: Platypodidae). Applied Entomology and Zoology. 46 (2), 201-210. DOI:10.1007/s13355-011-0032-3
Takahashi Y, Matsushita N, Hogetsu T, 2010. Spatial distribution of Raffaelea quercivora in xylem of naturally infested and inoculated oak trees. Phytopathology. 100 (8), 747-755. DOI:10.1094/PHYTO-100-8-0747
Tarno H, Qi HongYe, Endoh R, Kobayashi M, Goto H, Futai K, 2011. Types of frass produced by the ambrosia beetle Platypus quercivorus during gallery construction, and host suitability of five tree species for the beetle. Journal of Forest Research. 16 (1), 68-75. DOI:10.1007/s10310-010-0211-z
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