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麦蚜对麦田的破坏很大。保护好麦蚜天敌,可对麦蚜的控制起很好的作用。自然界中麦蚜的天敌极为丰富,种群数量大、控蚜作用强,也是其他作物害虫天敌主要来源。天敌有昆虫、蜘蛛、螨类、鸟类和真菌等。常见的有50种左右。天敌对麦蚜发生的影响主要是天敌捕食和寄生。七星瓢虫成虫日捕食量56头-150头,3龄-4龄幼虫日捕食64头-78头;大灰食蚜蝇2龄-3龄幼虫日捕食量47头-69头。在麦田益害比1:80以下,麦蚜数量即可被控制在为害损失经济允许指标
Wheat aphid great damage on the wheat field. The protection of wheat aphid natural enemies, can play a good role in the control of wheat aphids. Aphis natural enemies of extremely rich natural enemies, large populations, control of aphids strong, but also the main source of other crop pests natural enemies. Natural enemies include insects, spiders, mites, birds and fungi. There are about 50 kinds of common. The effects of natural enemies on wheat aphids are predators and parasites. The adult predatory adults of Coccinella septempunctata occupy between 56 and 150 first instar larvae, while those of the third instar and fourth instar larvae prey on 64 to 78 larvae respectively. In the wheat field benefit than the ratio of 1:80, the number of wheat aphids can be controlled at the loss of economic loss allowable index