KNIHINICKI, D. K.

MAJER, J. D.

QUEIROZ, D. L. de

English

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A new eriophyoid mite species (Acari: Eriophyoidea) damaging Eucalyptuswandoo in Western AustraliaKnihinicki D.K. (1), D.L. de Queiroz (2) and l.D. Majer (3)(1) NSW Industry & Investment, Orange Agricultural Institute, Forest Road Orange 2800; (2) EmbrapaFlorestas, Colombo, PR, Brazil/ Curtin University, Perth, WA; (3) Curtin University, Perth, WA.Several species of eriophyoid mites are known to cause damage to economically importanteucalypts. These inc1ude Rhombacus sp.n. and Acalox ptychocarpi Keifer on spotted gum,Corymbia maculata, a plantation tree in NSW and southem Queensland. Nevertheless,taxonomic information about eriophyoid mites from Australia, especially on native plants, ispoor. A new eriophyoid species, Acadicrus sp. n, has recent1y been discovered on aEucalyptus sapling in Armadale, WA, probably of E. wandoo, a commercial timber in shortsupply. This tiny, worm-like mite (about 200 um long), causes severe distortion of newgrowing tips in saplings which take on a mini ature witches' broom-like appearance. At firstglance, the symptoms can be mistaken for a plant disease. This is the fourth species in thegenus Acadicrus Keifer to be reported. Those previously described are: Acadicrus bifurcatusKeifer, 1965, Acadicrus mergiferus Keifer, 1965 and Acadicrus eucalypti (Gumey, 1924)found respective1y on Eucalyptus obliqua, E. viminalis and E. stricta. All species known sofar cause distortion of new growth and are possibly host specific. The frontal lobe on theprodorsal shield of Acadicrus forms two elongated processes which distinguishes it fromother c1ose1y re1ated genera of the tribe Phyllocoptini (Family: Eriophyidae). The genusAcadicrus has only been found in Australia so far. Based on the world-wide distribution oferiophyoid mites, certain genera, such as Acadicrus (4 spp.), Acalox (monotypic) andRhombacus (7 spp.), which have mostly been described from eucalypts, may haveGondwanan origins. Eriophyoids are highly host specific and further surveys undoubtedlywill reveal many unusual genera and species on Australian native plants which haveeconomic significance both here and overseas.Australian Entomological Society 4I" Annual General Meeting & Scientific Conference 101

A new eriophyoid mite species (Acari: Eriophyoidea) damaging Eucalyptus wandoo in Western Australia.

http://www.alice.cnptia.embrapa.br/bitstream/doc/885489/1/Australianentomologicalsociety41p101.pdf

A new eriophyoid mite species (Acari: Eriophyoidea) damaging Eucalyptus wandoo in Western Australia.

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