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砒酸铅和滴滴涕是果树上常用的两种杀虫剂。通常这两种都是单独使用,至少作者还没有听到过有混合使用的。1953年秋天,作者和胡益培、张昌辉等几位同志在河北武安进行几种山区果树害虫防治研究时发现了几个事实,使作者想到把这两种有效药剂加以混合使用的问题。这些事实是:(1)滴滴涕对柿星尺蠖(大头虫)的药效是既快且大。50%可湿粉加水500倍(有效浓度合千分之一)对中等大幼虫2小时即可产生麻痹,24小时可全部死亡,(2)滴滴涕对柿星尺
Lead 和 and DDT are two commonly used insecticides on fruit trees. Usually these two are used alone, at least the author has not heard of mixed use. In the autumn of 1953, several authors, such as Hu Yipei and Zhang Changhui, found several facts when conducting research on the pest control of fruit trees in mountainous areas in Wuan, Hebei Province, so that the author was reminded of the mixed use of the two effective agents. These are the facts: (1) DDT’s efficacy on persimmon scales (bugs) is fast and large. 50% wettable powder plus 500 times the water (effective concentration of one thousandth) medium larvae 2 hours to produce paralysis, all died within 24 hours, (2) DDT on Persimmon Star