黄地老虎在南通棉区发生危害逐年加重,春季一代幼虫危害棉苗,被害株率3—37％,平均10.2％,断茎率平均2.4％。秋季四代幼虫危害蚕豆,被害株率2.7—36.2％,平均22.1％;断枝率平均18.2％。 (一)发生规律 1.生活史:通过饲养观察,黄地老虎在沿海棉区一年发生四代,世代重迭。越冬代幼虫于3月中旬开始化蛹,4月上旬见蛾, Yellow tigers in the Nantong cotton area increased year by year, the harm of cotton seedlings per generation in spring, the victim plant rate of 3-37%, an average of 10.2%, an average of 2.4% broken stem. The fourth generation of autumn larvae endanger Vicia faba, strain rate of 2.7-36.2%, an average of 22.1%; average rate of 18.2%. (A) the occurrence of law 1. Life History: By feeding observation, yellow tigers in the coastal cotton area occurs four generations a year, overlapping generations. Overwintering on behalf of the larvae began pupation in mid-March, early April saw moths,