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近 2年 ,我市秋大白菜软腐病发生较重 ,发病田块占 90 %以上 ,损失率达 2 0 %～ 60 %。特别是菜区发病面积大 ,损失率高。一、发生原因1 .重茬严重 我市菜区大都连年种植马铃薯、萝卜、大白菜等 ,导致软腐病菌有寄主存在和在土壤中残存、积聚及有害物质积累 ,利于生理性和侵染
Nearly 2 years, the city of autumn cabbage soft rot disease occurred heavier, the disease field block accounted for more than 90%, the loss rate of 20% to 60%. In particular, the large area of food disease, high loss rate. First, the occurrence of the reason 1. Severe stubble In most of our vegetable planting potato, radish, Chinese cabbage, etc., resulting in the presence of soft rot bacteria host and residual in the soil, accumulation and accumulation of harmful substances conducive to physiological and infection