棉小造桥虫,鳞翅目夜蛾科。别名棉夜蛾、小造桥虫、步曲、小造桥夜蛾等。分布除西藏、新疆外,广布全国各植棉区。一般长势好的棉田发生多,危害重。小造桥虫的为害多在7月下旬以后,大发生的时间与损失关系密切,发生愈早,损失愈严重。为害特点幼虫为害先从棉株中、下部开始,1～2龄幼虫 Cotton small bridge parasite, Lepidoptera nymphalidae. Alias ​​cotton budworm, a small bridge insect, step music, such as small archworm moth. Distribution in addition to Tibet, Xinjiang, widely spread throughout the cotton area. Generally good cotton fields occur more serious harm. The damage caused by small bridges and more in late July after the big time and loss are closely related to the occurrence of the sooner, the more serious losses. Damage characteristics larvae damage first from the cotton plant, the lower part, 1 to 2 instar larvae