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小麦蚜虫是危害北京市昌平区小麦的主要害虫之一。据1979-2008年档案材料记载,每年昌平区都要投入大量化学药剂进行防治,挽回产量损失一般约11%。2009年,由于小麦蚜虫的天敌七星瓢虫幼虫的大量、适时的发生,有效地控制了蚜虫为害,30年来首次出现不经过药剂防治,小麦蚜虫百株蚜量由几百头到几十头,甚至几头的锐减现象,直至收获,未给小麦产量造成损失。
Wheat aphids are one of the major pests that endanger wheat in Changping District of Beijing. According to archives records from 1979 to 2008, every year, Changping District should invest a large amount of chemicals to prevent and control the loss of production, which is about 11% of the total loss. In 2009, due to a large number of natural enemies of wheat aphid Coccinella larvae occurred in a timely manner, effectively control the aphid damage, the first time in 30 years without pharmaceutical control, aphid hundreds of aphids from hundreds to dozens of heads, Even a few sharp drop phenomenon, until the harvest, did not result in loss of wheat yield.