苹果绵蚜的繁殖力很强,在昆明地区一年发生20代左右,几年来,由于不合理的使用666等广谱性农药,形成年年喷药治蚜害,蚜害却一年比一年严重,致使苹果生产受到不同程度的损失,个别受害严重的已濒于毁园。为此,我们从1977年起,连续四年,就这个问题,进行了初步探讨。在昆明地区,苹果绵蚜的天敌种类较多,一般常见有食蚜蝇、草蜻蛉、日光蜂和瓢虫等。通常情况下,早春天敌数量少,但到五月底,绵蚜处于盛发期,也正值小春作物收获末期,大量的天敌从春作田迁飞到苹果 Aphis gossypii has a very strong ability to reproduce. It takes about 20 generations a year in Kunming. Over the past few years, due to the unreasonable use of broad-spectrum pesticides such as 666, perennial sprays have been used to cure pest aphids. However, In a serious year, resulting in different levels of Apple’s loss of production, individual serious victims have been on the verge of destruction of the park. For this reason, we have conducted a preliminary study on this issue from 1977 onwards for four consecutive years. In Kunming, apple aphids predators species are more common in the hoverfly, lacewing, sunbeam and ladybugs and so on. Under normal circumstances, a small number of natural enemies in early spring, but by the end of May, cotton aphids in the flourishing period, but also the late spring harvest of small crops, a large number of natural enemies migrate from spring to apple