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近年,棉田害虫种类多,数量大,发生危害期长,喷洒残效期短,施药次数多,致使造成农药极大浪费。对此我所自1978年改喷洒为涂茎防治棉蚜之后,1979～1980年对棉铃虫的防治效果及其它害虫的兼治作用,进行了试验示范,取得一定结果,现介绍如下。一、试验方法。1、久效磷缓释剂的配制。聚乙烯醇1两,加热水3～5斤,使其化开,待冷凉后,
In recent years, the pest species in the cotton field are numerous, with a large number of occurrences, long-lasting damage, short spraying residuals, and frequent application of pesticides, resulting in great waste of pesticides. In this regard, I since 1978 after the spray to spray aphids for the prevention and treatment of cotton stalks, from 1979 to 1980, the control effect of cotton bollworm and other pests both for experimental demonstration, and achieved certain results are presented below. First, the test method. 1, the preparation of monocrotophos slow release agent. Polyvinyl alcohol 1 two, 3 to 5 pounds of heated water to make it open, to be cool,