Breedveld, Koen G. H.

Tanigoshi, Lynell K.

Undetermined

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Section IIIBiological & Cultural ControlTRICHOGRAMMA CACOECIAE, AN EGG PARASITOID TO CONTROL CHERRYBARK TORTRIXKoen G.H. Breedveld and Lynell K. Tanigoshi1Department ofEntomologyWashington State UniversityPullman, WA 99164-6382koenbreedveld@hotmail.comVancouver Research and Extension UnitVancouver, WA 98665-9752Naturally occurring Trichogramma cacoeciaeMarchal (Hymenoptera;Trichogrammatidae) populations occur as an egg parasitoid on Enarmoniaformosana (Scopoli),cherry bark tortrix (CBT) in Bellingham, Anacortes and Seattle. InJuly 2000, 50 parasitizedCBT eggs were collected from Cherry trees in Anacortes, Washington to establish acolony atWashington State University, Pullman. Mass production ofthis species is straightforward due totheir genetically thelytokous nature. In 2001, field studies were conducted in Seattle, Washingtonto look at the dispersal, parasitism rates, and the overall efficacy ofT. cacoeciae as abiologicalcontrol agent for CBT. Our release program was greatly aided by the USDA APHIS PPQlaboratory in Niles, Michigan, which agreed to utilize their Biological Control Laboratory tomass-produce T cacoeciae.In 2001, field experiments in Seattle included weekly releases ofT. cacoeciae to acquiredata on their intra- and inter-tree dispersal dynamics. Sentinel traps baited with irradiated eggsof the Mediterranean flour moth, Ephestia kuehniella, were placed at certain distances from thepoint ofrelease tosee how far T cacoeciae disperses. The releases also provided data on CBTegg parasitism, which ranged from an average of55% to as much as 95% atcertain sites (Fig. 1).Laboratory experiments with the T. cacoeciae colony will provide data on longevity,fecundity and storage capabilities at 5°C (Fig.2) for different life stages. Storage capabilities areimportant for the potential use ofT. cacoeciae to commercially control CBT. Longevity isgreatly increased with the presence ofa food source, which consequently results incontinuedegglaying. These field and laboratory experiments provide valuable datain our effort to combatthe continuous spread ofCBT from northwestern Washington, south into Oregon's urban forestsand potentially, east across the Cascade Mountain Range into Washington tree fruit regions.32

Trichogramma cacoeciae, an egg parasitoid to control cherry bark tortrix

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Trichogramma cacoeciae, an egg parasitoid to control cherry bark tortrix

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