棉铃虫是我国黄河流域棉区的常发性害虫。1990年第三、四代棉铃虫危害棉花成灾。1992年第一代在麦田和早播棉田发生,危害面积7000万亩左右。第二、三、四代连续大发生,棉花受害重,发生面积达1.3亿亩。且多种秋作物受到危害。造成棉铃虫大发 Cotton bollworm is a common pest in the cotton area of ​​the Yellow River in China. In 1990 the third and fourth generations of cotton bollworms endanger cotton disaster. In 1992 the first generation occurred in wheat fields and early-sowing cotton fields, with an area of ​​70 million mu. The second, third and fourth generation occurred in a row, with heavy cotton damage, with an area of ​​130 million mu. And a variety of autumn crops are harmed. Cause bollworm Daihatsu