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西瓜枯萎病是一种顽固的土传真菌病害。山东邹县近几年西瓜生产发展迅速,由于种植集中,重茬较多,发病逐年加重。轻病田减产20—30%,重病田减产70—80%,甚至绝产。1986—1991年对本病的发生规律和防治技术进行了研究,结果如下。1 发病规律1.1 轮作与发病关系选用有代表性的品种中育6号及特大新红宝,按重茬、与非葫芦科作物轮作2、3、4、5年栽植,每品种定4—6块病田,调查病株率和病情指数。调查结果为中育6号重茬、轮作2年、3年、4年、5年的病株率分别为
Watermelon wilt disease is a stubborn soil borne fungus disease. In recent years, Zou County, Shandong Province, watermelon production has developed rapidly. Due to the concentrated cultivation and repeated stubble, the incidence has been increasing year by year. Slight reduction of 20-30% of the field, severe disease reduction of 70-80%, or even abortion. 1986-1991 on the incidence of this disease and prevention and treatment techniques were studied, the results are as follows. 1 The incidence of disease 1.1 The relationship between rotation and disease The selection of a representative varieties Zhongyu 6 and extra large new ruby, according to continuous cropping, and non-Cucurbit crop rotation for 2,3,4,5 years of planting, each species is set 4-6 Diseases, the investigation of the disease rate and disease index. The survey results showed that the number of diseased plants in Zhongyu No.6 stubble, rotation for 2 years, 3 years, 4 years and 5 years were