90年代以前 ,当地棉铃虫的主害代是三、四代 ,近年来已逐渐扩大到五代 ,发生程度也越来越重。2 0 0 0年各代大发生 ,全年百株累计卵量 3.7万粒 ,是有史记载大暴发年 1 972年的 1 0倍。1　 2 0 0 0年棉铃虫暴发特点1 .1　发生期早、发生量大 ,来势猛 ,为害重。二代棉铃虫在当地 Before the 1990s, the main generation of the local cotton bollworm is the third and fourth generations, and in recent years it has gradually expanded to the fifth generation, and its occurrence is also getting heavier and heavier. All generations took place in 2000, with a total of 37,000 eggs accumulated per 100 plants a year, which is 10 times of that of 1972 recorded in the great outbreak of history. The characteristics of the bollworm outbreak in 2000 1. Second-generation cotton bollworm in the local