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一、油菜茵核病。俗称白秆、空秆、烂兜等,在油菜产区均有发生,油菜各生育期各部位均能受害,但以茎部受害最重。茎部发病,先从茎杆上出现梭形浅褐色水渍状病斑,略为凹陷,中部白色,边缘有褐色轮纹。在潮湿条件下病斑发展非常迅速,茎表皮破损,维管束外露呈丝状,髓部中空,易倒状,茎内形成许多似黑色鼠粪状菌核。严重时全株枯死,轻病株部分枯死或提早枯熟,种子不饱满,造成损失一般在10%左右,严重年份可达20%～40%以上。
First, rape Nodular disease. Commonly known as white stalks, empty stalks, rotten pocket, etc., have occurred in the rapeseed production areas, rape all parts of the growth period can suffer, but the heaviest stem damage. Stem pathogenesis, the first appeared on the stalk shuttle light brown water stain-like lesion, slightly concave, central white, brown rim pattern. Lesions develop rapidly under humid conditions, with damaged stem epidermis, filamentous exserted vascular bundles, hollow medulla oblongata, easy to upturn, and many black stool-like sclerotia in the stem. In severe cases, the whole plant is dead, the diseased plants are partially withered or prematurely withered, and the seeds are not full, resulting in loss of about 10% in general and up to 20% -40% in severe years.