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在室内测定了苏云金杆菌制剂对小菜蛾３、４龄幼虫取食量、发育历期、幼虫化蛹率、蛹的羽化率、成虫寿命和雌虫产卵量的影响。结果表明，小菜蛾３龄初幼虫取食Ｂｔ制剂后，３龄幼虫的取食量显著减少，而发育历期显著延长，但对能发育到４龄的幼虫其取食量和发育历期没有显著影响。小菜蛾４龄幼虫取食Ｂｔ后，幼虫化蛹率和成虫羽化率均显著下降，且下降幅度随Ｂｔ制剂浓度的增高而增大。用４００倍的Ｂｔ液剂供给小菜蛾成虫取食，虽然对其寿命没有显著影响，但可导致雌虫产卵量显著减少。
The effects of Bacillus thuringiensis preparation on the 3rd and 4th instar larvae of Plutella xylostella were determined indoors, the developmental duration, the larval pupation rate, the emergence rate of pupae, adult life expectancy and female fecundity. The results showed that the third instar larvae fed with Bt on the diamondback moth larvae fed on the first instar larvae significantly decreased their food intake and prolonged their developmental duration but did not have any significant effects on their larval developmental stages Significantly affected. The 4th instar larvae fed with Bt significantly decreased the larval pupation rate and emergence rate of adults, and the decreasing rate increased with the increase of Bt concentration. Feeding adults of Plutella xylostella with 400 times Bt liquor did not have a significant effect on their lifespan but resulted in a significant reduction in female fecundity.