自从七十年代以来,随着春玉米种植面积的逐渐减少,玉米螟对棉花的为害日趋严重。玉米螟幼虫在三龄前主要为害棉花嫩叶、花蕾和苞叶,三龄以后,由叶柄、果枝基部或嫩茎、赘芽钻入茎杆,造成茎叶萎蔫、茎杆折断、蕾铃脱落和烂铃。早发的棉花,特别是育苗移栽的棉花受害严重,严重 Since the seventies, with the gradual reduction of spring corn acreage, corn borer damage to cotton is more and more serious. Corn borer larvae mainly damage the young leaves, buds and buds of cotton before age three. After the third instar, the stems and leaves are wilted by the petioles, And rotten bell. Early onset of cotton, especially cotton seedlings transplanted severely damaged