油菜作物生育期长,易受各种病害的侵染,给产量带来很大的影响.了解油菜主要病害的症状及其防治技术,可以减少危害,增加产量,提高经济效益.(一)菌核病 主要由核盘菌侵染,在油菜整个生育期都有发生.为害叶、茎秆、分枝及角果.开花至乳熟期湿度是发病的主要气候因素.菌核病对油菜不同类型品种都能感染,一般白菜型品种较甘兰型品种易于感病,旱地比水田危害严重.品种间早熟品种染病最为严重,中熟品种次之,晚熟品种最轻. Rape crop growth period, susceptible to a variety of diseases of the infection, to yield a great impact.A understanding of the main symptoms of rape disease and its prevention and control technology, can reduce the harm and increase production, improve economic efficiency. Nuclear disease is mainly infected by Sclerotinia sclerotiorum, and it occurs throughout the growth period of rape. Damaged leaves, stems, branches, and fruit trees are the major climatic factors of the disease. Type of variety can be infected, cabbage-type varieties are generally more susceptible to disease Ganlan type, dry land is more serious than the paddy fields, the most serious varieties of cultivars, the second is the maturity of varieties, the lightest late-maturing varieties.