1993年,棉铃虫在我县从第二代开始就在棉田大面积发生和危害,第三、四代发生程度并重,而且世代重叠严重,二代累计百株卵量16粒、三代为111.3粒、四代为260.7粒。全县植棉面积0.53万hm~2,全年各代累计发生面积1.27万hm~2次,其中二代0.27万hm~2、三代0.47hm~2、四代0.53万hm~2。 In 1993, the cotton bollworm occurred in the cotton field in our county from the second generation onwards in a large area in 1993, the third and fourth generation occurred equally, and the generations overlapped seriously. The second generation accumulated a hundred eggs and 16 grains and 111.3 grains in the third generation , Four generations of 260.7 tablets. The county cotton area of ​​05300 hm ~ 2, throughout the year cumulative occurrence of an area of ​​12700 hm ~ 2 times, of which 2 2700 hm ~ 2, third generation 0.47hm ~ 2, fourth generation 05300 hm ~ 2.