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目前防治棉铃虫使用的药剂,防治三龄后幼虫的效果不够理想,因而在蛾、卵量较大的年份,常因防治不彻底而出现大量残虫,给棉花生产造成很大威胁。1973—1974年我们采用苏州化工厂“辛酯醇钠丙酮法”和连云港市综合化工厂“乙酯液碱法”(中间试验产品)生产的50％辛硫磷,作了些试验,结果表明辛硫磷具有以下特点: 1.具有强烈的触杀作用用浓度0.005—0.1％的辛硫磷稀释掖对三龄幼虫怍触杀试验,24、48小时后,杀虫率均为100％,显著优于当前常用的杀虫畏、双硫磷、杀虫脒、混灭威等农药。尤其对老龄幼虫是一
At present, the medicaments used for controlling cotton bollworm are not effective enough to control the larvae after the third instar age. Therefore, in the moths and the large number of eggs, a large number of plant diseases and insect pests often occur due to the incomplete control and threaten the cotton production. From 1973 to 1974, we conducted some experiments with 50% phoxim produced by the “chemical method of sodium octoate in acetone” of Suzhou Chemical Plant and the “ethyl ester method” of Lianyungang Chemical Industry Co., Ltd. (intermediate test product). The results showed that Phoxim has the following characteristics: 1. Has a strong role in contact with the concentration of 0.005-0.1% phoxim tampering tactile third instar larvae touch test, 24,48 hours after the insecticidal rate was 100%, significantly better In the current commonly used pesticides, diphtheria, chlordimeform, vancomycin and other pesticides. Especially for older larvae is one