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油菜白锈病是突发性病害,大流行年发病高于菌核病。据上海地区的发病情况,1967年以前重发年较多,龙头株率达11～18％;以后逐年下降。1973年大发生,受害面积达50余万亩。据奉贤、嘉定等县调查,平均龙头株率72.6％,最重达100％,每亩减产40斤左右。 侵染规律: 病菌初次侵染来源主要是残留在土壤中的病叶、茎、角果和花轴“龙头”内的卵孢子,以及带病种子。卵孢子在10℃左右、相对湿度90％以上萌发。
Rape white rust is a sudden disease, the prevalence of pandemic than sclerotinia. According to the incidence in Shanghai, there were more reemergence years before 1967, leading to a rate of 11-18%. Occurred in 1973, the victim area of more than 50 acres. According to Fengxian, Jiading and other counties survey, the average faucet plant rate of 72.6%, the most important up to 100%, about 40 pounds per mu reduction. The law of infection: The primary sources of infection of the bacteria are mainly the spores, the diseased leaves, the stems, the pods, and the “faucet” of the flower axis remaining in the soil, and the diseased seeds. Oospores in about 10 ℃, relative humidity above 90% germination.