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随着产业结构调整政策的深入开展,鲁西南地区早春大拱棚或温室种植叶用莴苣(又名生菜)面积逐年扩大。尤其在近几年,鱼台县早春保护地叶用莴苣栽培面积已达850hm2。但早春莴苣灰霉病发生较重,严重影响莴苣生产。据2002年2月中旬调查,一般发病株率20%～30%,发病严重地块52%以上,
With the deepening of the industrial restructuring policy, the area in the southwest of Shandong Province in early spring with big shed or greenhouse planting leaf lettuce (aka lettuce) has been expanding year by year. Especially in recent years, the cultivated area of lettuce leaves in early spring protection in Yutai County has reached 850hm2. However, in early spring lettuce gray mold occurred heavier, seriously affecting the lettuce production. According to the survey conducted in mid-February of 2002, the average disease incidence rate was 20% -30%, and the disease incidence was over 52%