小菜蛾属鳞翅目菜蛾科,是甘蓝上的重要害虫。初龄幼虫在叶片的上下表皮之间潜食叶肉,造成细小隧道;2龄幼虫除取食叶肉外,叶片下表皮也会被取食掉,仅留上表皮,俗称“开天窗”;大龄幼虫则把叶片吃成孔洞,尤其喜欢取食嫩叶,以菜心部位受害最重。小菜蛾食性专一,以十字花科蔬菜为主,比较喜欢取食甘蓝、大白菜,在屯留县属常发性害虫。由 Plutella is a member of the family Lepidoptera, an important pest on cabbage. The first instar larvae eat the mesophyll between the upper and lower epidermis of the leaves, resulting in a small tunnel. The second instar larvae except the mesophyll, the lower epidermis will also be eaten, leaving only the epidermis, commonly known as “open skylight”; older The larvae eat leaves into holes, especially like to eat young leaves, the most important parts of the cabbage injury. Plutella xylostella feeding specificity, mainly cruciferous vegetables, preferring to eat cabbage, Chinese cabbage, is a frequent pest in Tunliu County. by