1　棉铃虫的发生规律及特点棉铃虫在我区一年发生 3～ 4代 ,特殊年份如 1997年可部分进行不完全五代。一、二代世代间明显 ,三、四代各虫态并存 ,重叠现象十分严重 ,无明显蛾、卵、幼虫高峰期 ,其特点 :进入棉田早、范围广、面积大、虫量多、危害严重、世代重叠 ,越冬基数高。1 1 The occurrence and characteristics of cotton bollworm The cotton bollworm occurs in our district for 3 to 4 generations a year, and special years such as 1997 may partially carry out incomplete five generations. The first and second generations of the generation obviously, three or four generations of the coexistence of each state, the overlap is very serious, no obvious moths, eggs, larvae peak period, its characteristics: into the cotton field early, a wide range of large area, the amount of insects, hazards Serious, overlapping generations, high base of winter. 1