棉田甜菜夜蛾发生特点及防治江苏省姜堰市自１９９２年在棉田发现甜菜夜蛾后，发生量逐年增加，为害日趋加重，一般造成损失２～３成，严重地块５成以上。甜菜夜蛾在该市１ａ发生５代，一代在棉田外发生，二代迁入棉田，三至五代在棉田内发生。成虫日伏夜出，有趋杨柳枝的... Occurrence characteristics and control of beet armyworm in cotton fields Jiangyan City, Jiangsu Province, since the discovery of beet armyworm in cotton fields in 1992, the occurrence increased year by year, the damage is aggravating, generally resulting in loss of 2 to 3 percent, more than 50% of the block. Beet armyworm occurred in the city la 5 generations, one generation outside the cotton field, the second generation moved into the cotton field, three to five generations occurred in the cotton field. Adult lurking night out, there will be tendon branches ...