油菜菌核病是油菜三大病害之首，遍及全国各油菜产区且有日益严重之势，已成为油菜夺高产的重大障碍。1花期搞叶防病的机理油菜苗核病在油菜整个生育期如遇到适宜的环境，均可侵染为害，但以开花期最易发生。这是由于开花期，油菜正处于营养生长。生殖旺盛时期，叶面积大，株间 Sclerotinia sclerotiorum is the first of the three major diseases of rape, all over the country rapeseed producing areas and the increasingly serious situation, has become a major obstacle to rapeseed yield. 1 Florescence mechanism of leaf blight Rape seedling disease in the whole growth period of rapeseed encountered suitable environment, can be infected, but the most likely to occur at the flowering stage. This is due to flowering, rape is in vegetative growth. Reproductive period, leaf area, between strains