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应用 Bt 菌悬液对菜青虫进行了防治试验,防治效果为87.5～97.4％。应用适宜浓度为300～500倍。对人畜无害,是值得推广应用的生物制剂。
Application of bacterial suspension Bt cabbage prevention and control test, control effect of 87.5 to 97.4%. Appropriate concentration of 300 to 500 times. Harmless to humans and animals, is worth promoting the use of biological agents.