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研究了第 4代棉铃虫的百株 3龄幼虫量与夏大豆产量损失率的关系 ,组建了它们之间的相关式。分析提出其推广的防治指标为百株 3龄幼虫 35头。
The relationship between the third instar larvae of the fourth generation of cotton bollworm and the yield loss of summer soybean was studied, and the correlation between them was established. According to the analysis, the control index of its promotion is 35 first-instar larvae.