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我区位于河西走廊最西端,属大陆性气候,农作物以小麦为主,其次为玉米、蚕豆等。 麦蚜是麦类作物主要害虫,也是黄矮病传播的主要媒介。为避免环境污染和保护自然生态平衡,利用其天敌开展蚜虫的生物防治是重要的课题。 瓢虫是麦蚜的重要天敌。1979—1981年,我们对瓢虫进行了优势种的调查,并对其生活习性、发生规律、饲养及释放等进行了研究。在我区已发现的瓢虫有15种,其中有8种(见表1)在小麦、玉米、胡麻、蚕豆等作物上取食蚜虫。多异瓢虫Adonia variegaa(Goeze)是优势
My area is located in the westernmost Hexi Corridor, a continental climate, mainly wheat crops, followed by corn, broad beans and so on. Wheat aphid is a major pest of wheat crops and is also the main medium for the transmission of yellow dwarf virus. In order to avoid environmental pollution and protect the natural ecological balance, the biological control of aphids using their natural enemies is an important issue. Ladybird is an important natural enemy of wheat aphids. From 1979 to 1981, we investigated the dominant species of ladybugs and studied their habits, regularity, feeding and release. There are 15 ladybugs found in our district, of which 8 (see Table 1) feed on aphids in crops such as wheat, corn, flax, and broad beans. Adonia variegaa (Goeze) is the advantage