油菜跳是油菜的主要害虫之一。秋季,油菜播种出苗后,越夏成虫迁入为害。啃食嫩叶,严重时嫩时被啃食始尽。2月上旬幼虫孵出后,很快就粘入叶、茎、根组织内蛀食为害。幼虫蛀食时片多从叶柄蛀入,没中脉蛀食叶肉,严重时叶肉被食光,仅留下上、下表皮,叶片枯自干死:蛀入茎杆、根茎的幼虫,在其内纵横蛀食,根、茎被食空,造成死苗, 严重时导致毁种。5月中旬前后,成虫大 Rape shrimp is one of the major pests of rape. Autumn, rapeseed emergence, the more adults into the summer harm. Nibbled young leaves, when tender, when grazing is done. After the larvae hatch in early February, they will stick to the leaves, stems and root tissues in the body sooner. When the larvae eat more from the pest eaten, no mesophytes eaten the mesophyll, severe when the leaves were edible, leaving only the upper and lower epidermis, the leaves withered dry: insects into the stems, rhizomes of larvae, in which Vertical and horizontal eaten food, roots, stems are emptied, resulting in dead seedlings, causing serious devastating species. Around mid-May adult large