油菜菌核病是以菌核在土壤里越冬,次年开春后菌核萌发产生病菌孢子,首先落入油菜花瓣,再由花瓣落入油菜下部老叶入侵茎秆基部发生菌核病。因此,打去油菜下部的老叶、黄叶和腐叶,能有效地切断油菜菌核病的传播,达到防病的效果。同时,打老叶还能改善植株间通风透光条件,降低田间湿度,起到减缓病菌繁殖、防止病害迅速传播的作用。据试 Sclerotinia sclerotiorum sclerotiorum in the soil with winter, the next spring after the spores germ bacteria spores, first fall into the rape petal, and then by the petals fall into the rape of the lower part of the old leaves invasion stem sclerotinia. Therefore, hitting the lower part of the old rape leaves, yellow leaves and rot leaves, can effectively cut off the spread of rape Sclerotinia, to prevent disease. At the same time, playing old leaves can also improve the plant ventilation and light conditions, reduce field humidity, play to slow the propagation of germs to prevent the rapid spread of disease. According to test