槐豆木虱生物学特性及其防治

Bionomics and insecticide control of Cyamophila willieti .

槐豆木虱Cyamophilawillieti(Wu)近年来在山西中部发生逐年加重 ,造成国槐 (SophorajaponicaL .)、龙爪槐 (SophorajaponicaVar.)严重受害。该虫 1年发生 4代 ,以成虫在树冠杂草下、土缝中越冬。室内饲养观察 ,成虫单头产卵量为 1 1 0 0± 1 4 94粒 ,卵孵化率为 (88 0± 1 72 ) % ,若虫共 5龄。对 3龄左右若虫进行了室内、室外药剂防治试验 ,处理 48h后 ,若虫死亡率均在 90 %以上 ,以浓度为 3 3 3mg L的5

Cyamophila willieti (Wu) is a serious pest of Sophora japonica L. in central Shanxi Province. It has four generations in a year.It overwinters as an adult in weeds,cracks in soil or under the crown of trees.Adults of the overwintering generation appear in early April.In the middle ten days period of October the last generation begins to overwinter.The average quantity of eggs per female adult in captivity is 110 0±14 94 and the hatch rate is 88 0%±1 72%.Nymph has five instars altogether. Seven natural enemies of C. willieti has are recorded.Indoor and outdoor pesticides control trials have been carried out.Five percent alphacypermethrin was the most effective pesticide at concentrations of 33 3 mg/L.