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本试验通过安排Bt粉剂3个不同剂量与18%杀虫双水剂500倍液对照,结果表明:Bt粉剂50g/667m2、70g/667m2对甘蓝小菜蛾有较好的防治效果,末次药后10d平均防效为91.48%~92.85%。由于Bt粉剂是一种生物制剂,在提倡无公害蔬菜生产的今天具有广阔的推广前景。建议防治甘蓝小菜蛾适宜浓度为50～70g/667m2。
In this experiment, Bt powder 50g / 667m2, 70g / 667m2 had good control effect on the diamondback moth, Plutella xylostella by arranging 3 different doses of Bt powder and 500 times of 18% The average control effect is 91.48% ~ 92.85%. As Bt powder is a biological agent, it has broad promotion prospects in promoting the production of pollution-free vegetables. Proposed control cabbage diamondback moth suitable concentration of 50 ~ 70g / 667m2.