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从事棉铃虫预测预报工作,要正确估计蛾群数量,必须首先了解蛾群在各个发生时期的群态组成情况。1973年全国农作物病虫害预测预报办法中指出:在棉铃虫发蛾初期蛾群中雌蛾多于雄蛾,盛期雌雄蛾比例接近一比一,末期则雄蛾多于雌蛾。它阐明了棉铃虫不同发蛾时期的群态组成,但未指出蛾群性比指标的变幅和检查蛾数的界限标准。为
Helicoverpa armigera forecasting work, to correctly estimate the number of moths, we must first understand the moths in various stages of the occurrence of the cluster composition. The National Crop Pest Forecasting and Prediction Act of 1973 pointed out that the female moths were more than male moths in the early moth group, and the ratio of male and female moths was close to one to one in the early stage, while the male moths were more than the female moths in the final stage. It elucidated the composition of the group of cotton bollworm at different stages of hair moths, but did not point out the limits of the moth group sex ratio and the number of check moths. for