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我县是老棉区,近二十年来,连续施用剧毒化学农药防治棉蚜,杀死了大量的害虫天敌,棉蚜的抗药性逐渐增强,虫害日益猖獗,环境受到污染,工本费不断提高,但棉花产量反而降低了。为了解决上述问题,我们自1979年春在5.16亩棉田内进行了间作冬油菜的试验,冬油菜不抽薹,利用它的幼嫩叶丛繁养了大量的蚜虫。这些蚜虫招引来了多种天敌,象瓢虫、草蛉、螳螂、蜘蛛等,用这些天敌再消灭棉田中的蚜虫。我们认为,利用这个方法比使农药和人工捕瓢,放瓢效率高,工本费用低,1亩地仅用半个工和0.2元钱左右的油菜籽就解决问题了。采取这种消灭蚜虫的方法,既不污染环境,又可保持棉田间的生态平衡,是当前生物防治棉蚜经济有效的新途径。具体做法如下:
My county is the old cotton area, nearly 20 years, the continuous application of highly toxic chemical pesticides to control cotton aphids, killing a large number of natural enemies of pests, cotton aphid drug resistance gradually increased, insect pest is rampant, polluted environment, rising costs , But cotton production has actually decreased. In order to solve the above problem, we conducted inter-crop winter rapeseed in the spring of 1979 in a trial of 5.16 acres of cotton field. Winter rapeseeds were not bolted and a large number of aphids were raised using its young foliage. These aphids invoked a variety of natural enemies, such as ladybugs, weeds, praying mantis, spiders, and so on, with these natural enemies and then eliminate cotton aphids. In our opinion, using this method is more effective than making pesticides and artificial catches and ladle, and the cost of the sample is low. The problem is solved by using only half a piece of labor and 0.2 yuan of rapeseed on one mu. Taking such a method to eliminate aphids can not only pollute the environment but also maintain the ecological balance among the cotton fields, which is a new and effective way for the biological control of the cotton aphid currently. Specific practices are as follows: