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1997年～1999年连续三年春播时,我在油菜茬玉米地块试用毒叶进行防治,取得了良好的效果,田间保苗率97％以上,虫口下降率94.7％。另据室内试验,用毒叶饲喂3龄以上幼虫,致死率100％。
From 1997 to 1999 for three consecutive years of spring sowing, I tried to control the poisonous leaves in the rapeseed corn plots and achieved good results. The seedling protection rate in the field was above 97% and the drop rate of the population was 94.7%. According to laboratory tests, with poisonous leaf feeding 3 larvae above mortality of 100%.