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大白菜软腐病是大白菜最主要的病害之一,发生面积广,危害损失大。我市常年损失20～35%,严重年份达75%以上。1982年因软腐病严重发生,大面积的大白菜几乎全部腐烂。市蔬菜公司只好从山东调入数万斤大白菜供应市场,出现了历史上从未有的北菜南调的局面。为了摸清软腐病的发生发展规律,探索有效的防治措施。自1980—1988年通过大面积观察、定点调查,对比试验等方法进行试验研究,结果表明软腐病的发生与气候、品种、生育期等关系极其密切。一、气候与发病的关系1、发病与降雨量的关系。我市从1983年开始,以栽植山东杂交一代大白菜品种为主。一般是8月中旬至、9月上、中旬播种,10月下旬至次年元月收获。软腐病发生时间从9月中
Chinese cabbage soft rot disease is one of the most important diseases of Chinese cabbage, occurring in a wide area, damaging the loss. The city perennial loss of 20 to 35%, a serious year of 75% or more. Due to the serious occurrence of soft rot in 1982, a large area of Chinese cabbage almost completely decayed. Vegetable companies in the city had to transfer tens of thousands of pounds of Chinese cabbage from Shandong supply market, there has never been the history of the North South tune. In order to find out the occurrence and development of soft rot disease and explore effective prevention and control measures. From 1980 to 1988 by large area observation, sentinel surveys, comparative tests and other methods of experimental study showed that the occurrence of soft rot disease and climate, breed, growth period is extremely close. First, the relationship between climate and incidence 1, the incidence and the relationship between rainfall. Since 1983, our city has mainly planted the hybrid Chinese cabbage varieties in Shandong. Generally mid-August to September, mid-sowing, late October to January harvest the following year. Soft rot occurs from mid September