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我公社现有果树26万株。其中苹果16万株,每年防治果树病虫害药费多达10万元;同时由于使用农药种类的不断增多,用量不断增加,倍数不断提高,虽然防治了害虫,但也杀死了益虫;果品和树下的残毒在一定程度上有所增加。长期以来,我社贫下中农在使用药剂防治果树病虫害的同时,通过观察,发现田间有一些昆虫——天敌,可以帮助我们消灭果树害虫,并了解了这些天敌的生活规律。这样,有的生产区从1974年开始就利用天敌来防治果树上的红蜘蛛和蚜虫,农药费减少了60.8％,在生产上收到明显的防治效果。可是单纯利用自然界的天敌来控
My commune has 260,000 fruit trees. Of which 160,000 are apples each year, and the annual prevention and control of pests and diseases costs as much as 100,000 yuan. At the same time, as the types of pesticides used continue to increase, the dosage is continuously increasing and the multiples are constantly increasing. Although the pests are controlled, beneficial insects are also killed. Fruits and trees Under the residual drug to some extent increased. For a long time, the poor and middle peasants in our society used pesticides to prevent and control pests and diseases of pests. Through observation, we found that there are some insects in the field - natural enemies, which can help us to eliminate fruit pests and understand the laws of life of these natural enemies. In this way, some production areas have used natural enemies to control red spiders and aphids on fruit trees since 1974, and the pesticide costs have been reduced by 60.8%, which has shown obvious prevention and control effects in production. But simply using the natural enemies of nature to control