油菜蚜虫的发生不但直接危害油菜,而且还能传播病毒导致病毒病发生。油菜一生中,有二次发生蚜虫高峰,第一次在苗期,第二次在成熟前的角果发育期。油菜出苗后,蚜虫亦随之迁入,随着苗的长大,蚜虫也由田外继续迁入并繁殖,数量不断增加,10月下旬至11月下旬形成第一高峰,以后随气温下降,蚜 Rape aphid not only directly affects the occurrence of rape, but also spread the virus lead to virus disease. Rape in the life, the second occurrence of aphids peak, the first in the seedling stage, the second in the maturity of the pod development. After the emergence of rapeseed, aphids also moved in. As the seedlings grew up, the aphids continued to move in and out of the field, increasing in number. The first peak was formed from late October to late November, and then decreased with temperature.