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西安郊区许多地方种植棉花,近年来棉铃虫、棉蚜等主要害虫连续发生为害,造成棉花产量下降、品质低劣。使用化学农药防治效果虽好,但由于长期使用有机磷农药,棉虫产生抗性,致使药效降低,防治次数增多,药费开支大,用工多。尤其是棉株生长盛期,植株茂密,施药困难,在防治效果上存在一定局限性,并可形成杀伤天敌昆虫,留有残毒等问题。为了寻找防治棉花害虫的新途径,我们在1975年开门办学期间,利用天敌对棉花主要害虫进行了防治试验,现将试验结果分述如下:
In many suburbs of Xi’an, cotton is planted. In recent years, major pests such as cotton bollworm and cotton aphid have been continuously harmed, resulting in the decline of cotton yield and poor quality. The use of chemical pesticide control effect is good, but due to the long-term use of organophosphorus pesticides, cotton insects produce resistance, resulting in lower efficacy, prevention and control increased the number of large medical expenses, labor and more. In particular, cotton plant growth, lush plants, pesticide application difficulties, there are some limitations in the control effect, and can form natural enemies of insects, leaving residues and other issues. In order to find a new way to prevent and control cotton pests, we used predators to control cotton major pests during their door-to-door operation in 1975. The test results are summarized as follows: