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我省棉区从1956年以来全面推广药剂治虫,对棉花增产起了显著作用。但随着喷药次数和药剂浓度的增加,也出现了一些问题。表现在棉虫天敌大量被杀死,某些害虫(如棉蚜、红蜘蛛对1059、1605)产生了抗药性等,已成为害虫猖獗发生原因之一。例如1971和1972两年棉铃虫大暴发,近两年棉蚜在个别产棉县一跃而为最主要害虫。本试验为了进一步探明棉田施药对棉虫天敌的影响,以便找出既能保护天敌,又能使害
Cotton province since 1956 to promote the universal drug pest control, cotton production increased significantly. However, with the increase of spraying times and drug concentration, some problems appeared. It is shown that a large number of natural enemies of cotton have been killed, and some pests (such as cotton aphids and red spiders have resistance to 1059 and 1605) have become one of the causes of rampant pests. For example, the large-scale outbreak of cotton bollworms in both 1971 and 1972 has led to the development of cotton aphids in the past two years as the most important pest. In this experiment, in order to further ascertain the impact of cotton field application of natural enemies of cotton insects, in order to find out both to protect natural enemies,