小麦蚜虫的优势天敌及对蚜虫的自然控制

小麦蚜虫天敌资源丰富 ,其优势天敌在甘肃环县有 30余种。各种蚜虫天敌在小麦不同生育期先后衔接、互相配合 ,对小麦蚜虫的发生起着有效的自然控制作用 ;蚜虫与天敌在不同年际间也呈现出一定的规律性变化。保护利用天敌应与测报、防治和改善生态环境相结合

Dominant natural enemies of wheat aphids and natural control their impacts in wheat fields

The natural enemy resources are rich in Huanxian County,Ganshu Province. Among them, more than 30 species are dominant natural enemies of wheat aphids. They inhibited the occurrence of aphids efficiently by acting one after another and coordinately during the whole growth period of wheat. Both the aphids and the natural enemies occurred with a regular pattern in different years. The protec| tion and utilization of the natural enemies should be carried on in combination with forecasting,controlling and improving the environment.