我省常年春季多雨,寒潮频繁,从3月下旬开始,油菜菌核病和霜霉病往往发生普遍而严重,到成熟期达到发病高峰。据调查:菌核病发病株率一般在10—20％,严重的达60％以上;霜霉病在白菜型油莱上一般发病株率在10—30％,严重的达50％以上。因此,必须不失时机地做好防治工作,以夺取油菜新丰收。 Rainy spring all year round in our province, cold frequent, from the beginning of late March, rape sclerotinia and downy mildew are common and serious, to reach the peak incidence of maturity. According to the survey: the incidence of sclerotinia is generally 10-20%, severe up to 60%; downy mildew in cabbage-type oil on the general incidence of strains in 10-30%, severe up to 50%. Therefore, we must seize the opportunity to prevent and control work in order to seize the new harvest of rape.