Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide


Dreyfusia nordmannianae
(silver fir adelges)



Dreyfusia nordmannianae (silver fir adelges)


  • Last modified
  • 15 November 2018
  • Datasheet Type(s)
  • Invasive Species
  • Pest
  • Preferred Scientific Name
  • Dreyfusia nordmannianae
  • Preferred Common Name
  • silver fir adelges
  • Taxonomic Tree
  • Domain: Eukaryota
  •   Kingdom: Metazoa
  •     Phylum: Arthropoda
  •       Subphylum: Uniramia
  •         Class: Insecta
  • Summary of Invasiveness
  • Several conifer aphids of the family Adelgidae were probably introduced on nursery stock from Asia to Europe in the nineteenth century on imported fir (Abies spp.) and most of them were unknown before reaching...

  • There are no pictures available for this datasheet

    If you can supply pictures for this datasheet please contact:

    CAB International
    OX10 8DE
  • Distribution map More information

Don't need the entire report?

Generate a print friendly version containing only the sections you need.

Generate report


Top of page

Preferred Scientific Name

  • Dreyfusia nordmannianae (Eckstein, 1890)

Preferred Common Name

  • silver fir adelges

Other Scientific Names

  • Adelges (Dreyfusia) nordmannianae (Eckstein, 1890)
  • Adelges nordmannianae (Eckstein, 1890)
  • Adelges nüsslini (Börner)
  • Adelges nüsslini Annand, 1928
  • Chermes nordmannianae Eckstein, 1890
  • Chermes nüsslini (Börner)
  • Dreyfusia funitecta
  • Dreyfusia nüsslini Börner, 1908
  • Dreyfusia schneideri

International Common Names

  • English: migratory adelges of silver fir; silver fir migratory adelges; silver fir woolly aphid
  • French: chermès des rameaux; chermès du sapin

Local Common Names

  • Denmark: almindelig ædelgranlus
  • Finland: jalokuusikirva
  • Germany: Stammlaus, Nordmannstannen-; Tannentrieblaus; Tannentrieblaus, Einbruetige
  • Netherlands: Zilversparwolluis

EPPO code

  • DREYNU (Dreyfusia nuesslini)

Summary of Invasiveness

Top of page

Several conifer aphids of the family Adelgidae were probably introduced on nursery stock from Asia to Europe in the nineteenth century on imported fir (Abies spp.) and most of them were unknown before reaching Europe (Kenis et al., 2007). D. nordmannianae was introduced in Europe in the 1840s on imported Nordmann fir (Abies nordmanniana) and moved onto a new host, the European silver fir, Abies alba, where it has since caused important damage on young silver fir trees and Nordmann fir plantations (Bejer, 1981; Nierhaus-Wunderwald and Forster, 1999; Kenis et al., 2007).

Taxonomic Tree

Top of page
  • Domain: Eukaryota
  •     Kingdom: Metazoa
  •         Phylum: Arthropoda
  •             Subphylum: Uniramia
  •                 Class: Insecta
  •                     Order: Hemiptera
  •                         Suborder: Sternorrhyncha
  •                             Unknown: Aphidoidea
  •                                 Family: Adelgidae
  •                                     Genus: Dreyfusia
  •                                         Species: Dreyfusia nordmannianae

Notes on Taxonomy and Nomenclature

Top of page

The evolutionary history and taxonomy of the Adelgidae (or conifer woolly adelgids), which form a small clade of insects within the Aphidoidea (Hemiptera), is still unresolved. For many years, Dreyfusia nordmannianae has been known as Adelges nüsslini (Börner), especially in European countries (Carter, 1971; Havill and Foottit, 2007). D. nordmannianae (Eckst.) has also been confused with Adelges piceae (Ratzeburg) because both species are morphologically very similar and are found on the same hosts (Abies). D. nordmannianae is endemic to Caucasus and Turkey, where its main hosts are found, and epidemic in Europe, whereas A. piceae (the Balsam woolly aphid) causes damage in North America (Eichhorn, 1967; Bryant, 1971; Carter, 1971).

Two systems have been used to arrange adelgids into genera: one by Börner and Heinze (1957) and one by Steffan (1968). The second one by Steffan is preferred (Havill and Foottit, 2007) and is used in this datasheet.


Top of page

The Adelgidae are relatively small, cryptic insects, exhibiting complex life cycles with parthenogenetic reproduction. Aphids have up to five life stages (pentamorphic) and therefore the morphology of aldegids’ morphs is complex. The characteristics of the different morphs are often very similar within a family or sometimes between families (Steffan, 1972; Alles, 1994). For detailed descriptions of the morphology of D. nordmannianae, see Eichhorn (1969) and Carter (1971). For a general description of the adelgid holocycle, see the review by Havill and Foottit (2007).

D. nordmannianae is a dark-brown aphid with an adult body length of 1.5 mm. First instars are 0.4-0.5 mm long (Blackman and Eastop, 1994). Its life cycle takes 2 years in its country of origin (Caucasus, eastern Pontus Mountains and Crimea) where it performs a holocycle with its host, alternating between Picea orientalis and Abies nordmanniana (a holocyclic species includes a sexual generation in its usual cyclic parthogenetic life cycle). P. orientalis is the primary host on which the sexual reproduction and gall forming takes place. Population growth takes place on the second host, Abies spp., with a series of parthenogenetic generations of highly fertile morphs. In European countries where it has been introduced, D. nordmannianae reproduces parthenogenetically because P. orientalis is usually absent and the sexual part of the life cycle is excluded (Alles, 1994). However, P. omorica can be used as an alternative host is P. orientalis is not present (H Ravn, personal communication).


Top of page

Outside its natural range (the Northern hemisphere boreal and temperate climate environments; more precisely the higher regions of the west Caucasus), D. nordmannianae is found with silver and Nordmann fir plantations in Europe (Nierhaus-Wunderwald and Forster, 1999). D. nordmannianae has the potential to invade all areas where the host(s) are grown. The distribution area of firs is limited to the mountainous regions of eastern, western, southern and central Europe. This area ranges from 52°N in the north (Poland) to 40°N in the south (northern border of Greece) and from 5°E in the west (western Alps) to 27°E in the east (Romania, Bulgaria). Isolated occurrences can be found in France in Central Massif and the Pyrenees, and in northern Spain (Pyrenees extending the western limit to 1°W). Some specimens can be found in central and southern Italy (Calabria) extending the southern limit to 38°N. In the distribution area northeast of the river Danube, silver fir can be found at altitudes from 135 m above sea level in Poland to 1350 m in the eastern Carpathians (Romania). Southwest of the Danube, it grows from 325 m in the Apennines (Italy) to 2100 m in the western Alps, and extending up to 2900 m in the Pirin Mountains (Bulgaria). Within the main distribution area, the species forms a belt 500-600 m (800 m) wide, which moves to higher altitudes from north to south (from Wolf, 2003).

Distribution Table

Top 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.

Continent/Country/RegionDistributionLast ReportedOriginFirst ReportedInvasiveReferenceNotes


Georgia (Republic of)PresentNative Not invasive Kenis et al., 2007; Foottit et al., 2009Natural enemy population present
TurkeyPresentNative Not invasive Kenis et al., 2007Natural enemy populations present


AustriaPresentIntroducedKurir, 1971; Bauer-Schmid, 1983
Czech RepublicPresentIntroduced Invasive Sefrová and Lastuvka, 2005
Czechoslovakia (former)PresentIntroducedHochmut, 1964
DenmarkPresentIntroduced Invasive Foottit et al., 2009
FrancePresentIntroduced Invasive Nageleisen, 2005
GermanyPresentIntroducedNierhaus-Wunderwald and Forster, 1999
HungaryPresentIntroducedTill, 1941; Borusiewicz and Capecki, 1975
IrelandPresentCarter et al., 1987
ItalyUnconfirmed record
NorwayPresentIntroduced Invasive Anon., 2008b
RomaniaPresentBorusiewicz and Capecki, 1975Reported in the Carpathian mountains
Russian FederationPresentPresent based on regional distribution.
-Southern RussiaPresentNative Not invasive Foottit et al., 2009Presence of natural enemies
SlovakiaPresentIntroducedZúbrik, 1998; Kollár et al., 2009
SloveniaPresentIntroduced Invasive Foottit et al., 2009
SwitzerlandPresentIntroducedFoottit et al., 2009
UKPresentIntroducedCarter and Barson, 1973
UkrainePresentBorusiewicz and Capecki, 1975Reported in the Carpathian mountains


AustraliaPresentPresent based on regional distribution.
-TasmaniaPresentIntroducedAnon., 2008aPresent throughout Tasmania


Top of page
Introduced toIntroduced fromYearReasonIntroduced byEstablished in wild throughReferencesNotes
Natural reproductionContinuous restocking
Europe 1920s Seed trade (pathway cause) Yes Nierhaus-Wunderwald and Forster (1999) From the Caucasus to Europe, except Germany and Switzerland
Germany 1880s Seed trade (pathway cause) Yes Nierhaus-Wunderwald and Forster (1999) From the Caucasus
Switzerland 1880s Seed trade (pathway cause) Yes Nierhaus-Wunderwald and Forster (1999) From the Caucasus

Risk of Introduction

Top of page

There is a high risk of introduction via infested nursery stock anywhere that Abies spp. and Picea orientalis hosts are grown commercially or as ornamentals.

Habitat List

Top of page
Terrestrial – ManagedManaged forests, plantations and orchards Principal habitat Productive/non-natural
Urban / peri-urban areas Secondary/tolerated habitat Productive/non-natural
Terrestrial ‑ Natural / Semi-naturalNatural forests Principal habitat Natural

Hosts/Species Affected

Top of page

Adelgids are highly host-specific; D. nordmannianae only attacks secondary hosts in the genus Abies (Havill and Foottit, 2007).

Abies nordmanniana and Picea orientalis originate from Caucasus where they grow in stands with Fagus orientalis. The distribution areas of these species are associated with altitudes 1000-2000 m above sea levels (Løfting, 1973). In Northern Europe forestry, P. orientalis is absent. Another Picea spp. is present in Northern Europe, Picea abies, but D. nordmannianae could not adapt to this host (Nierhaus-Wunderwald and Forster, 1999). The sexual part of the D. nordmanniane life cycle is therefore absent and Abies spp. is the only host available to this pest.

List of Symptoms/Signs

Top of page
SignLife StagesType
Growing point / distortion
Leaves / abnormal colours
Leaves / abnormal forms
Leaves / abnormal leaf fall
Leaves / leaves rolled or folded
Stems / dieback
Stems / distortion
Stems / galls
Stems / witches broom
Whole plant / discoloration
Whole plant / external feeding

Biology and Ecology

Top of page

 Adelgidae display cyclical parthenogenesis and have complex, multigeneration, polymorphic life cycles. The Adelgidae differ from the Aphidiae by the absence of siphunculi (the pair of protruding organs found on the dorsal side of the last segment of the abdomen and also called cornicles, through which a sugary secretion is extruded) and the retention of oviparity in all generations. Adelgids feed on gymnosperms and only on certain genera in the Pinaceae (Heie, 1987; Havill and Foottit, 2007). D. nordmannianae performs a holocycle with host alternation between Picea orientalis (its primary host) and Abies (secondary host). Sexual reproduction takes place on the primary host, Picea orientalis.

Reproductive Biology

The following section is from Kirkeby-Thomsen (1998).

In the country of origin (the Pontus massive in Caucasus and northern Turkey), the life cycle of D. nordmannianae takes 2 years. In the summer, females lay eggs (sexuales) in between the Caucasian spruce needles. In August, the eggs hatch into fundatrix crawlers, which wander on the host and settle near a bud. After settling, the fundatrix undergoes diapause and overwinters as a first-instar larva. In the spring, the fundatrix moults through 2nd and 3rd stage larvae to imago and starts to lay eggs (from 300 to 500 eggs). The fundatrix induces the galls from the bud of P. orientalis on which it feeds. The bud swells and after bud break the needles swell at the bases (Varty, 1956). The gallicola hatch from eggs laid by the fundatrix, and these crawlers settle at the swollen needle base in the bud. Their feeding completes the gall formation. In the gall cavities, the gallicola develops through four larval stages. The gall is terminal, unlike other Adelges (Adelges cooleyi and Adelges viridis). Shoot growth does not go beyond the gall. Adult gallicola are alate and migrate to the secondary (or intermediate) host (Abies spp.). On the secondary host, gallicola migrants settle on the needles and produce up to 40 eggs. Neosistens crawlers hatch from these eggs, settle on the twig and overwinter as first-instar larvae. In the spring, they moult through three instars into the adult stage. Sistens means the generation that stops. Sistens have three larval instars (Eichhorn, 1970). Eggs laid by gallicola, hiemosistens, aestivosistens and progrediens aptera can all hatch into sistens. The sistens can either be a hiemosistens (hiemo = winter) or an aestivosistens (eastivo = summer). After hatching and locating a suitable feeding site on the newly-developed twig, the hiemosistens stops its development and spends the summer as a first-instar larva. Late in summer or early autumn, it moults from second to third instar and overwinters. In spring, just prior to bud break, the development is finished and parthenogenetic egg production is initiated. Aestivosistens is a summer generation that will reproduce once over midsummer. This generation is rare and is usually not considered (Varty, 1956).

Progrediens is the generation that continues or progresses. Progression after hatching establishes it on the abaxial surface of the newly-formed needles. If for some reason the progrediens do not have access to new needles, they may start feeding on one-year-old needles. If the feeding site is not suitable the progrediens will die without reproducing. According to Varty (1956), the progrediens is negative geotactic and positive phototactic, preferring the upper branches on infested trees. Progrediens that settle on the new needles will moult through four larval instars into adults, becoming waxy, and starting to produce eggs. The fecundity of progrediens is low; only 10-15 eggs are produced per female (Varty, 1956; Eichhorn, 1970). A fraction of the progrediens that settle on the new needles differentiate morphologically to become alate. This is the sexupara generation that will migrate to locate the primary host (P. orientalis) again. It is not possible to distinguish between the progrediens apetra and the sexuapara in the first larval instars at the time of establishing on the needles. In the last larval instar, the wings are visible. The sexupara does not produce wax on Abies spp. Sexupara migrate to P. orientalis, where it settles and overwinters. It produces a light wax, and in the spring, egg laying starts. As with apterous progrediens, the fecundity is low (Varty, 1956). The sexuales is the sexual generation where both females and males are present. Varty (1956) describes young P. orientalis shoots that retain their bud scale during flushing, and it is under this scale that the sexuales crawlers gather and establish. Larval mortality is very high in this generation.

Physiology and Phenology

In the yearly anholocycle that relates to Northern European conditions, where the primary host, P. orientalis is absent, only sistens are produced in the winter; they then transform into progrediens aptera or sexupara in the spring with no sexual reproduction into alate sexuales, and back to the sistens in the winter. In this case, the gallicolae are very rare both due to the absence of the primary host and the failure of the sexuales. The sexupara is produced and migrates to locate P. orientalis, but no or very few gallicola return to Abies spp. to contribute to population growth. In the anholocycle under North European conditions, sistens overwinter as third-instar larvae, finish their development in the spring prior to bud break and start egg laying. From the eggs, sistens hatch that establish on twigs; progrediens aptera settle on new needles; and sexupara alate migrate to a primary host that does not exist. Sistens hatch from the progrediens generation, which settle on the twigs. Sistens moult into third instars in the late summer and overwinter.

Natural enemies

Top of page
Natural enemyTypeLife stagesSpecificityReferencesBiological control inBiological control on
Aphidecta obliterata Predator Adults/Nymphs
Leucopis Parasite Egg to genus
Scymnus impexus Predator Adults/Nymphs Sweden

Notes on Natural Enemies

Top of page

Kenis et al. (2007) report that a natural enemy of D. nordmannianae, first reported in Turkey and also found in Russia and Georgia, could be a good candidate for biological control. This chamaemyiid fly, Leucopis sp., has been reported to kill 50% of D. nordmannianae eggs in Turkey in the spring. L. hennigrapta appears to be an important predator of D. nordmannianae in Turkey and possibly the Caucasus. Small populations of D. nordmannianae in Turkey seemed to correlate with high levels of predation by L. hennigrapta. Other potential candidates have been found in the area including undetermined dipterans from the Syrphidae and Cecidomyiidae families and coleopterans from the families Coccinellidae and Derodontidae.

Means of Movement and Dispersal

Top of page

If both hosts are present, dispersal occurs with alate sexupara that allow migration from the secondary host Abies spp. to the primary host Picea orientalis. Alate forms will be produced both on main host and other hosts. If P. orientalis is absent (in most fir plantations in Europe), alate may not be produced; in this case, spread is dependent on passive transportation or due to crawling from one branch to another from a neighbouring tree (Kirkeby-Thomsen, 1998).

Impact Summary

Top of page
Economic/livelihood Negative
Environment (generally) Negative


Top of page

Nordmann fir (Abies nordmanniana) is the main tree species for Christmas tree production in many Northern European countries and adelgid attack is a severe problem that causes important losses in plantations (Jacobsen, 1988; Larsen et al., 1997).

Economic Impact

Top of page

Mass attacks of D. nordmannianae are rare and occur only outside the natural distribution area of Abies spp. Important losses can be encountered in European fir plantations (Eichhorn, 1967). Denmark is Europe’s leading producer of Nordmann fir Christmas trees with 10 million Danish Christmas trees exported in 2004 (Mainz, 2005). The cost of annually spraying areas of Christmas tree production, in order to tackle D. nordmannianae, is significant.

Environmental Impact

Top of page

Impact on habitats

In its native environment, D. nordmannianae is believed to be an endemic species living in mixed stands with its two hosts Abies nordmanniana and Picea orientalis. Major infestations are rare in the Caucasus mountains as natural enemies keep D. nordmannianae population levels down.

Social Impact

Top of page

Hosts in botanical gardens, parks and private gardens might be affected. Not all trees die from an infestation with D. nordmannianae, and different levels or resistance have been observed. Only young firs are at risk, as the risk of infestation decreases as the trees age (Kirkeby-Thomsen, 1998; Nierhaus-Wunderwald and Forster, 1999).

Risk and Impact Factors

Top of page Invasiveness
  • Proved invasive outside its native range
  • Has high reproductive potential
  • Has propagules that can remain viable for more than one year
  • Reproduces asexually
Impact outcomes
  • Host damage
  • Negatively impacts cultural/traditional practices
  • Negatively impacts forestry
Impact mechanisms
  • Pathogenic
Likelihood of entry/control
  • Highly likely to be transported internationally accidentally
  • Difficult to identify/detect as a commodity contaminant
  • Difficult/costly to control

Detection and Inspection

Top of page

Silver firs with lush green needles are more attractive to D. nordmannianae than older, yellowish trees with short shoots. The first attack usually occurs as the trees are young and up to 1.5 m in height. As the trees reach 2 m and more, the chances of attack decrease. D. nordmannianae are light- and warm temperature-loving insects and need sunny exposition for their development. The first signs of infestation will be found on young, free-standing firs at thicket or plantation edges and exposed to the sun. The general symptoms described in this datasheet are the ones found on fir (from Nierhaus-Wunderwald and Forster, 1999) and not Picea orientalis, the Caucasian spruce.

The overwintering, dark larvae develop into egg-producing females early, which then lay their eggs close to the buds in the spring. As the eggs hatch on spring shoots, fir needles infected with dark D. nordmannianae larvae curl back and get deformed into a 'bottle brush' shape as the larvae feed on them. Infestation with the harmless twig aphid (Mindarus abietinus) causes the needles to curl up, exposing the white, waxy stripes outside, whereas D. nordmannianae curls the needles the other way. The larvae eventually migrate to the abaxial surface of the needles. A few months later, white, waxy secretions are found on the abaxial surface of the needles and fresh clutches of D. nordmannianae are also found on shoots and needles. On the abaxial surface of the youngest needles, sucking young larvae can reach high population densities. At high attack densities, the fir tips eventually turn yellow, the needles drop and the whole tip will die down. On the stem, dark spots surrounded by whiter, woolly and fluffy material can be found as the adults are feeding on the sap of the stems. The bark of the older stems eventually cracks into pox-like chips. The shoot will swell at its base and the buds will no longer burst and die. The tree will be weakened by the feeding activity of D. nordmannianae and is susceptible to secondary attacks and infections by pathogens and other pests.

Note that galls can be formed by the sexual morphs, but only on the primary host (P. orientalis) so galls are not found on firs.

Morphological characteristics for identification under anholocyclic conditions (no sexual cycle, only found with Abies spp. hosts)

This relates to the description of neoprogrediens only (see Biology and Ecology text section for a detailed life cycle and names of the different morphs).

The first-instar sistens larvae are used to determine species. The genus is characterized by the presence of five pairs of lateral abdominal spiracles. All stages have an elongated form. There is much variation in chitinization and wax gland distribution between morphs, but both characteristics are constant for one morph of any one species (Carter, 1971). The number of wax pores within the spinal-plates of the meso- and meta-thorax and the first three abdominal segments on the first-instar sistens larvae can be used to distinguish between European species of Adelgidea (see Eichhorn, 1967). D. nordmannianae looks like a scale and has the shape of a turtle with dorsal plates. It is brownish yellow when it settles on bark for feeding, but soon turns black. All the way around the body margin and in a row across the dorsal side, wax is produced by a series of wax glands (Blackman and Eastop, 1994; Kirkeby-Thomsen, 1998).

Similarities to Other Species/Conditions

Top of page

D. nordmannianae is very similar to Dreyfusia piceae, at the time referred as to Adelges nordmiannae and Adelges piceae (Eichhorn, 1967). Havill et al. (2007) later demonstrated that the sequence divergence between these two species is only small (0.18–0.36%).

Prevention and Control

Top 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.

Cultural Control and Sanitary Measures

Cutting and burning (on site) of severely-attacked trees during the winter is a cultural control measure used in forested areas where no chemicals are used. Firs should be propagated and grown underneath a slightly thinned mature stand or mixed with young alder or European rowan (Nierhaus-Wunderwald and Forster, 1999). Firs with little damage to the top shoots should be spared as resistance to D. nordmannianae will increase with age.

Movement Control

Do not pull uprooted trees heavily infested with D. nordmannianae through a plantation; the aphids could spread to healthy firs by contact.

Biological Control

Some options proposed by Kenis et al. (2007) include a chamaemyiid fly, Leucopis sp., some dipterans from the Syrphidae and Cecidomyiidae families and coleopterans from the families Coccinellidae and Derodontidae. Ravn et al. (2013) found L. hennigrata to be the most promising biological agent. L. hennigrapta appears to be an important naturally-occuring predator of D. nordmannianae in Turkey and possibly the Caucasus. Small populations of D. nordmannianae in Turkey seemed to correlate with high levels of predation by L. hennigrapta

Chemical Control

Chemical control is used in Christmas tree plantations and might be necessary during the growing season to protect the trees from 'bottle brush' deformation. Compounds used include synthetic pyrethroids, nicotinoids, organophosphates and carbamates (Demolis et al., 1991, 1999; Palmer, 2009).

Host Resistance (incl. vaccination)

Ongoing breeding and research in quantitative genetics of Nordmann fir Christmas trees are taking place in Denmark, and results indicate substantial economic gains (Nielsen and Hansen, 2000). Natural resistance had been observed in the past in Abies nordmanniana and Abies alba by Varty (1956), Løfting (1973), Larsen et al.(1984) and others. Natural resistance was then confirmed by Kirkeby-Thomsen (1998). Since then some molecular projects have been initiated such as the development of microsatellite markers in A. nordmanniana (Hansen et al., 2005). The breeding programme uses clonal seed orchards (CSOs) and testing of open-pollinated families (half-sib families) (Hansen and Kjær, 2006).


Top of page

Alles D, 1994. Investigations on the life cycle of the conifer woolly aphid Adelges (= Dreyfusia) nordmannianae Eckst. (Hom., Adelgidae) in Central Europe. (Untersuchungen zum Generationszyklus der Tannenlaus Dreyfusia nordmannianae Eckstein (Hom., Adelgidae) in Mitteleuropa.) Journal of Applied Entomology, 117(3):234-242.

Anon, 2008. Adelges (Dreyfusia) nordmannianae (Eckstein, 1890). Australian Biological Resource Study, Australian Fauna Directory. Canberra, Australia: Australian Government, unpaginated.

Anon, 2008. Examples of non-native insects that have become established in Norway. Examples of non-native insects that have become established in Norway., Norway: Directorate for Nature Management.

Bauer-Schmid B, 1983. On the taxonomy, biology and dispersal of the the silver fir adelgid Dreyfusia nordmanniae (Eckst.) (Hom. Adelgidae) in the Tyrol. (Zur Taxonomie, Biologie und Ausbreitung der Tannentrieblaus Dreyfusia nordmannianae (Eckst.) (Hom. Adelgidae) in Tirol.) Anzeiger für Schädlingskunde Pflanzenschutz Umweltschutz, 56(7):128-131.

Bejer B, 1981. Insect risks for introduced and native conifers in Northern Europe, especially in the Nordic countries. Bulletin, Organisation Europeenne et Mediterraneenne pour la Protection des Plantes, 11(3):183-185.

Blackman RL; Eastop VF, 1994. Aphids on the worlds trees. An identification and information guide. The Natural History Museum. Wallingford, UK: CAB International.

Blackman RL; Eastop VF, 1994. Aphids on the world's trees: an identification and information guide. Wallingford, UK: CAB International.

Borusiewicz A, 1975. [English title not available]. (Badania nad wystepowaniem i szkodliwoscia mszycy Dreyfusia nordmanniannae Eckstein w drzewostanach karpackich w Polsce.) Zeszyty Problemowe Postepów Nauk Rolniczych, 162:431-435.

Borusiewicz A; Capecki Z, 1975. [English title not available]. (Badania nad wystepowaniem i szkodliwoscia obialki pedowej (Dreyfusia nordmaniannae Eckst.) w karpackich lasach jodlowych.) Prace Instytutu Badawczego Lesnictwa, 478:3-86.

Bryant DG, 1971. Balsam woolly aphid Adelges piceae (Homoptera: Phylloxeridae), seasonal and spatial development in crowns of balsam fir. Abies balsamea. Canadian Entomologist, 103(10):1411-1420.

Buttermore RE; Pomeroy N; Hobson W; Semmens T; Hart R, 1998. Assessment of the genetic base of Tasmanian bumble bees (Bombus terrestris) for development as pollination agents. Journal of Apicultural Research, 37(1):23-25.

Börner CV; Heinze K, 1957. Aphidina-Aphidoidea. Homoptera 2. Teil. In: Tierische Schadlinge an Nutzpflanzen [ed. by Blunck, H.]. Berlin, Germany: Paul Parey, 323-55.

Carter CI, 1971. Conifer woolly aphids (Adelgidae) in Britain. Bull. For. Comm., Lond. No. 42 pp. 51 + 21 plates. [50 refs. Price 75p.].

Carter CI, 1976. A gall forming adelgid (Pineus similis (Gill.)) new to Britain with a key to the adelgid galls on Sitka spruce. Entomologist's Monthly Magazine, 111(1328/30):29-32.

Carter CI; Barson G, 1973. Flight activity of alate Adelgids (Homoptera, Aphidoidea) in southern England. Bulletin of Entomological Research, 62(3):507-516

Carter CI; Wood-Baker CS; Polaszek A, 1987. Species, host plants and distribution of aphids occurring in Ireland. Irish Naturalists' Journal, 22(7):266-284

Demolis C; François D; Gregy JC; Chaplain C; Cuynet D; Lalevee M; Lis V; Journot JN; Grisey M, 1991. Chemical control of Dreyfusia nordmannianae. (Lutte chimique contre Dreyfusia nordmannianae (Chermès des rameaux du sapin pectiné).) Bulletin Technique - Office National des Forêts, No. 20:41-50.

Durrer S; Schmid-Hempel P, 1994. Shared use of flowers leads to horizontal pathogen transmission. Proceedings of the Royal Society of London. Series B, Biological Sciences, 258(1353):299-302.

Eastop VF, 1966. A taxonomic study of Australian Aphidoidea. Australian Journal of Zoology,14:399-592.

Eckstein K, 1890. [English title not available]. (Zur Biologie der gattung Chermes L.) Zoologischer Anzeiger, 13:86-90.

Eichhorn O, 1967. On methods of differentiating the species of the harmful white woolly aphids (genus Dreyfusia CB = Adelges An.) on Fir, and the consequences for forest protection. Technical Bulletin. Commonwealth Institute of Biological Control, No. 8:53-82.

Eichhorn O, 1969. Problems of the determination of morphs in the genus Dreyfusia CB. Adelges (Homoptera, Adelgidae). Zeitschrift fur Angewandte Entomologie, 64(4):437-446.

Eichhorn O, 1970. Influence of varying photoperiods and light intensities on the embryonic development of Dreyfusia nusslini CB (= D. nordmannianae Eckst.) (Hemipt.: Adelgidae). Zeitschrift fur Angewandte Entomologie, 66(1):59-64.

Eichhorn O, 1973. Conclusions from the occurrence of galls of Dreyfusia nordmannianae Eckst. (= D. nusslini CB.) in central Europe on its generation cycle. (Folgerungen aus dem Auftreten der Gallen von Dreyfusia nordmannianae Eckst. (= D. nusslini CB.) in Mitteleuropa auf ihren Generationszyklus.) Zeitschrift fur Angewandte Entomologie, 74(2):196-199.

Eichhorn O, 1991. On the generation cycle of Dreyfusia nordmannianae Eckst. (Hom., Adelgidae). (Zur Frage des Generationszyklus von Dreyfusia nordmannianae Eckst. (Hom., Adelgidae).) Journal of Applied Entomology, 112(3):217-219.

Foottit RG; Maw HEL; Havill NP; Ahern RG; Montgomery ME, 2009. DNA barcodes to identify species and explore diversity in the Adelgidae (Insecta: Hemiptera: Aphidoidea). Molecular Ecology Resources, 9(1):188-195.

Hansen OK; Kjær ED, 2006. Paternity analysis with microsatellites in a Danish Abies nordmanniana clonal seed orchard reveals dysfunctions. Canadian Journal of Forest Research, 36(4):1054-1058.

Hansen OK; Vendramin GG; Sebastiani F; Edwards KJ, 2005. Development of microsatellite markers in Abies nordmanniana (Stev.) Spach and cross-species amplification in the Abies genus. Molecular Ecology Notes, 5:784-787.

Havill NP; Foottit RG, 2007. Biology and evolution of Adelgidae. Annual Review of Entomology, 52:325-349.

Havill NP; Foottit RG; Dohlen CDvon, 2007. Evolution of host specialization in the Adelgidae (Insecta: Hemiptera) inferred from molecular phylogenetics. Molecular Phylogenetics and Evolution, 44(1):357-370.

Heie OE, 1987. Paleontology and phylogeny. In: Aphids: Their Biology, Natural Enemies and Control [ed. by Minks, A. K. \Harrewijn, P.]. Amsterdam, Holland: Elsevier, 367-391.

Hingston AB; Marsden-Smedley J; Driscoll DA; Corbett S; Fenton J; Anderson R; Plowman C; Mowling F; Jenkin M; Matsui K; Bonham KJ; Ilowski M; McQuillan PB; Yaxley B; Reid T; Storey D; Poole L; Mallick SA; Fitzgerald N; Kirkpatrick JB; Febey J; Harwood AG; Michaels KF; Russell MJ; Black PG; Emmerson L(et al), 2002. Extent of invasion of Tasmanian native vegetation by the exotic bumblebee Bombus terrestris (Apoidea: Apidae). Austral Ecology, 27(2):162-172.

Hochmut R, 1964. The problem of Dreyfusia (Adelges) nordmannianae in Czechoslovakia, and its control. Lesnicky Casopis, 10(10):879-90.

Inari N; Nagamitsu T; Kenta T; Goka K; Hiura T, 2005. Spatial and temporal pattern of introduced Bombus terrestris abundance in Hokkaido, Japan, and its potential impact on native bumblebees. Population Ecology ["Cooperation among unrelated individuals", 21st Symposium of the Society of Population Ecology, 2003, Tsukuba, Japan.], 47(1):77-82.

Jacobsen F, 1988. [English title not available]. (Juletræer og klippegrønt.) In: Skoven og dens Dyrkning [ed. by Henriksen, H. A.]. Copenhagen, Denmark: Dansk Skovforening, Ny Nordisk Forlag Arnold Busk,, 607- 636.

Kenis M, 2005. Insects-Insecta. In: An inventory of alien species and their threat to biodiversity and economy in Switzerland [ed. by Wittenberg, R.]. Delemont, Switzerland: CABI Bioscience, 131-212. [Centre Report to the Swiss Agency for Environment, Forests and Landscape.]

Kenis M; Rabitsch W; Auger-Rozenberg MA; Roques A, 2007. How can alien species inventories and interception data help us prevent insect invasions? Bulletin of Entomological Research, 97(5):489-502.

Kirkeby-Thomsen A, 1998. Host plant resistance in A. nordmanniana to D. nordmannianae. Danish Environmental Protection Agency Report 39., Denmark: Ministry of Environment and Energy, 67 pp.

Kollár J; Hrubík P; Tkácová S, 2009. Monitoring of harmful insect species in urban conditions in selected model areas of Slovakia. Plant Protection Science, 45(3):119-124.

Kurir A, 1971. Occurrence of Dreyfusia [Adelges] nusslini in Austria and its control, 1947-1970. Zeitschrift fur Angewandte Entomologie, 67(3):325-35.

Larsen JB; Larsen BG; Kromann HK, 1984. Provenances of Abies nordmanniana for greenery and Christmas tree production. [Abies nordmanniana provenienser til pyntegront og juletraeer.] Forstlige Forsogsvaesen i Danmark, 39(3):363-382; 13 ref.

Larsen JB; Nielsen UB; Møller IS, 1997. [English title not available]. (Nordmannsgran- proveniensvariation, forædling og frøkildevalg.) Træarts-og Proveniensvalget i et Bæredygtigt Skovbrug, 82 [ed. by Larsen, J. B.]. 203-213.

Løfting ECL, 1973. A survey of the present state of Caucasian fir in Denmark. Det forstlige Forsøgsvæsen I Denmark, XXXIII(3):304-326.

Mainz H, 2005. Eksporten 2004. PS Naledrys. 4-8.

Morandin LA; Laverty TM; Kevan PG; Khosla S; Shipp L, 2001. Bumble bee (Hymenoptera: Apidae) activity and loss in commercial tomato greenhouses. Canadian Entomologist, 133(6):883-893.

Mrkva R, 1994. Silver fir woolly aphid (Adelges (= Dreyfusia) nordmannianae Eckstein): its control and its role in fir decline. (Korovnice kavkazská (Adelges (= Dreyfusia) nordmannianae Eckstein), obrana proti ní a její podíl na ústupu jedle.) Lesnictví - Forestry, 40(9):361-370.

Nageleisen LM, 2005. Les principaux problèmes phytosanitaires signales dans les forets françaises durant l'année 2003. Bilan de santé des forêts en 2003 ([English title not available])., France: Ministère de l'Agricluture et de la Pêche, Département de la santé des forêts.

Nielsen UB; Hansen OK, 2000. Clonal progenies of Nordmann fir for Christmas Tree Production., Denmark: Skov & Landskab Reports, 58-61.

Nierhaus-Wunderwald D; Forster B, 1999. [English title not available]. (Zunehmendes Auftreten der Gefährlichen Weisstannentrieblaus.) Biologie und Empfehlungen für Gegenmassnahmen, Wald Holz, 80(10):50-53.

Palmer C, 2009. Aphid control in Christmas trees - the options. Aphid control in Christmas trees - the options. unpaginated.

Ravn HP; Havill NP; Akbulut S; Foottit RG; Serin M; Erdem M; Mutun S; Kenis M, 2013. Dreyfusia nordmannianae in Northern and Central Europe: potential for biological control and comments on its taxonomy. Journal of Applied Entomology, 137(6):401-417.

Sefrová H; Lastuvka Z, 2005. Catalogue of alien animal species in the Czech Republic. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis Sborník Mendelovy Zemedelské a Lesnické Univerzity v Brne, LIII:18.

Sierpinski Z, 1985. Air pollution and forest pests. (Luftverunreinigungen und Forstschädlinge.) Zeitschrift für Angewandte Entomologie, 99(1):1-6.

Sierpinski Z, 1987. Forest insect pests as bioindicators of air pollution? (Szkodliwe owady lesne bioindykatorami zanieczyszczen powietrza?.) In: Reakcje biologiczne drzew na zanieczyszczenia przemysowe. Materiay II Krajowego Sympozjum [ed. by Siwecki, R.]. Poznan, Poland: Wydawnictwo Naukowe Universitetu im. Adama Michiewicza, 321-325.

Steffan AW, 1968. [English title not available]. (Evolution und Systematik der Adelgidae (Homoptera: Aphidina): EineVerwandtschaftsanalyse auf vorwiegend ethologischer, zytologischer und karyologischer Grundlage.) Zoologica, 115:1-139.

Steffan AW, 1972. [English title not available]. (Unterordnung Aphidina, Blattlause.) In: Die Forstschadlinge Europas, 1 [ed. by Schwenke, W.]. Hamburg, Germany: Verlag Paul Parey, 162-386.

Szelegiewicz H, 1968. Katalog fauny polski. Catalogus faunae Poloniae. Czesc XXI, zeszyt 4. Mszyce Aphidodea (Catalogue of the fauna of Poland. Volume XXI, part 4. Aphids Aphidoidea.), 21:316 pp.

Till D, 1941. Dreyfusia nusslini in Hungary. (A Dreyfusia nusslini elofordulasa hazankban.) Erdeszeti Lapok, 80:351-8.

Varty IW, 1956. Bull. For. Comm, 26. Edinburgh, H.M.S.O., iv + 75 pp.

Washitani I, 1998. Conservation-ecological issues of the recent invasion of Bombus terrestris into Japan. Japanese Journal of Ecology, 48(1):73-78.

Widmer A; Schmid-Hempel P; Estoup A; Scholl A, 1998. Population genetic structure and colonization history of Bombus terrestris s.l. (Hymenoptera: Apidae) from the Canary Islands and Madeira. Heredity, 81(5):563-572.

Wolf H, 2003. EUFORGEN Technical Guidelines for genetic conservation and use for silver fir (Abies alba). EUFORGEN Technical Guidelines for genetic conservation and use for silver fir (Abies alba). Rome, Italy: International Plant Genetic Resources Institute, 6 pp.

Zúbrik M, 1998. Dreyfusia nordmannianae and some aspects of its control. Lesy a lesníctvo pre tretie tisícroIie, Zborník referátov. 271-277.

Zurovcová M; Havelka J; Starý P; Vechtová P; Chundelová D; Jarosová A; Kucerová L, 2010. "DNA barcoding" is of limited value for identifying adelgids (Hemiptera: Adelgidae) but supports traditional morphological taxonomy. European Journal of Entomology, 107(2):147-156.

Links to Websites

Top of page


Top of page

27/07/10 Original text by:

CRCNPB Australia, CRC for National Plant Biosecurity, Canberra, Australia

Distribution Maps

Top of page
You can pan and zoom the map
Save map