我省西部农村有“蚜虫起泡,丰收在望”的说法。用针轻轻挑破起泡蚜虫的皮,发现体内有一头卷曲着的幼虫,这就是蚜茧蜂的幼虫。人们还经常发现,正常的玉米螟卵是白色的,即使是接近孵化的卵,也只在卵的中央有一个小黑点。但有时这白白的卵块却逐渐地变成漆黑一片,几天过后,便有小蜂子从中飞出。这就是寄生在玉米螟卵内的赤眼蜂。无论是蚜茧蜂还是赤眼蜂,都属于寄生性天敌昆虫,它们的卵和幼虫不能独立生活, Western rural areas in our province have “aphids bubbling, harvest in sight,” saying. Gently prick the blistered aphid skin with a needle and notice that there is a curly larva in the body, which is the larva of the aphid Braconidae. It is also often found that the normal corn borer egg is white, and even near hatched eggs, there is only a small black spot in the center of the egg. But sometimes the white eggs gradually become dark, after a few days, there are bees flying out. This is the trichogramma parasitized in the corn borer eggs. Neither aphid Braconidae nor Trichogramma are parasitic natural enemy insects whose eggs and larvae can not live independently,