油菜菌核病是当前油菜的重要病害之一。菌核的形成主要在春季油菜生长的后期。茎、叶、花、荚角各部都可受害,但以茎部受害最重。受害茎部起初出现淡褐色水渍状病斑,后变为棱形灰白色大斑块。病茎皮层霉烂,茎内部空心,表皮破裂,纤维外露,以致断裂枯死。在病斑表面或病茎内部会生黑色鼠粪状的菌核。近年来,随着油菜栽培面积的扩大,施肥水平的提高,我县菌核病有逐年加剧的趋势。由于该病所造成的损失,轻者减产3—5％,重者减产 Sclerotinia sclerotiorum is one of the most important diseases in rapeseed. The formation of sclerotia mainly in the late spring rape growth. Stems, leaves, flowers, pod horns can be affected, but most affected by stems. Injured stalk initially appeared light brown water stain-like lesion, later became a prism gray large patches. Stem cortex mildew, stem hollow, epidermal rupture, fiber exposure, resulting in rupture of the dead. In the lesion surface or sick stems will produce black rat feces-like sclerotia. In recent years, with the expansion of rape cultivation area, fertilization level, my county sclerotinia has increased year by year trend. As a result of the loss caused by the disease, the light output reduction of 3-5%, severe reduction