苏云金素对东亚小花蝽捕食作用的影响

IMPACT OF THURINGIENSIN ON THE PREDATION OF ORIUS SAUTERI NYMPH TO TETRANYCHUS URTICAE EGGS

采用二次回归最优设计，研究苏云金素对东亚小花蝽捕食作用的影响，得出日均捕食量（ｙ）与猎物（ｘ１）和捕食者（ｘ２）之间互作关系模型。处理捕食数量回归方程：ｙ＝－０．００２１ｘ２１＋１．２１１２ｘ２２＋０．８８２２ｘ１－１０．３４６５ｘ２－０．０６４９ｘ１ｘ２＋１．７１７４；对照捕食数量回归方程：ｙ＝－０．００１７ｘ２１＋０．７７３４ｘ２２＋０．６９４１ｘ１－６．４９１４ｘ２－０．０４７４ｘ１ｘ２－０．４６３６。综合定性分析和定量分析结果，苏云金素处理东亚小花蝽若虫，减弱了其对二斑叶螨卵的捕食能力，但二者的差异不显著。

Thuringiensin, a bio-product of Bacillus thuringiensis isolate CT 43, was t ested for its effect on the predation of the newly hatched nymph Orius sauteri to Tetranychus urtiae eggs using in the quadratic optimum regression desi gn. The elationship between the day average numbers of preys (y) and the number of preys(y) and the number of preys (x 1) and predators (x 2) was found to fal l into the following models: Y treatment =-0.0021(x 1) 2+1.2112(x 2) 2+0.8822x 1-10.3465x 2 -0.0649x 1x 2+1.7174 Y control =-0.0017(x 1) 2+0.7734(x 2) 2+0.694x 1-6.4914x 2-0.0474x 1x 2-0.4636 The qualitative and quantitative analysis indicated that the predation capacity of O.sauteri to T.urticae eggs was weakened when the newly hatched nymp h were treated by thuringiensin, but the impact wa not significant compared with the control. This result showed that thuringiensin could be considered as an ef fective control agent of two spotted spider mite and relative safe to O. saut eri.