1 油菜菌核病。油菜菌核病,俗称百杆、麻杆、烂杆。全国各油菜产区都有不同程度的发生,温暖潮湿地区此病发生较重。从苗期到成熟期都可发病,以开花期后最严重:而且各个部位均能受害,以茎部受害最重。 苗期病斑多数在地而根茎相接处发生,形成水渍状红褐色斑点,逐渐扩大成白色,湿度大时长出白色絮状白霉,严重时使病部软腐,形成许多黑色鼠粪状菌核,导致幼苗死亡。在盛花期,叶病株率达10％以上、茎病株率1％以上时,开始用药。可选用10％菌核净可湿性粉剂 1 rape sclerotinia. Rape Sclerotinia, commonly known as the bar, Ma, rotten rod. All the rapeseed producing areas in the country have different degrees of occurrence, and the disease is more serious in warm and humid areas. From the seedling to mature stage can be the most serious after flowering: and all parts of the victims can suffer the heaviest stem damage. Seedling lesions most of the rhizomes at the junction, the formation of water-like reddish-brown spots, gradually expanding into white, when the humidity is white flocculent out of white mold, the Ministry of severe soft rot disease, the formation of many black rat droppings Bacterial sclerotia, leading to the death of seedlings. In full flowering, leaf disease plant rate of 10% or more, more than 1% stem plant strain, began to medication. Optional 10% sclerotioronic net WP