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1991年秋和1992年春季,分别在兰溪和金华使用Bt—781悬浮剂对马尾松毛虫越冬前后的幼虫进行防治试验。结果表明,此药是较速效的生物农药,在每公顷用药1125ml时,7天死亡率达92%以上,每公顷成本仅9元左右,较为经济。
In the autumn of 1991 and the spring of 1992, the larvae of Dendrolimus punctatus before and after winter were treated with Bt-781 suspension in Lanxi and Jinhua, respectively. The results showed that the drug was a more effective biopesticide. When the dosage was 1125ml per hectare, the 7-day mortality rate was over 92% and the cost per hectare was only about 9 yuan, which was more economical.