油菜苗床及以后移栽油菜的前期,常常会受到跳甲和猿叶虫的危害,使油菜叶上出现孔洞,生长不良,严重危害时油菜苗仅留下叶脉,菜苗被咬的支离破碎,影响移栽和栽后早发,这两种害虫常常混合发生与危害。一、危害症状这两种害虫均喜食油菜幼苗及嫩叶,咬食叶片成稠密的小孔,大发生年份油菜刚一出苗即被咬食一空,即使是大油菜苗,也可被咬食 Rape seedbed and later transplanting rape of the early, often by the beetles and vermilion hazards, so that rape leaves appear holes, poor growth, serious damage to rape seedlings leaving only the veins, seedlings were bite fragmentation, affecting the shift Early planting and transplanting, the two pests are often mixed occurrence and harm. First, the harmful effects of these two pests are like to eat rapeseed seedlings and young leaves, bite the leaves into a dense hole, the occurrence of large rape just year out of the seed that is bite empty, even the large rape seedlings can also be biting