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近年来上海市郊区油菜菌核病有逐年上升趋势,1980～84年的五年间,笔者先后调查了10个郊县64个公社(乡),5个农场,6个县级农科所,2个县级良种场,7个公社农科站,20个公社级种子场,共1487块田,133477株油菜,发现油菜菌核病发病率和病情指数都逐年上升。平均发病率,80年为2.05%,81年为0.61%,82年为9.82%,83年为21.91%,84年为35.05%。病情指数,80年为1.16,81年为0.37,82年为5.44,83年为14.03,84年为16.43。六十年代至七十年代中期,上海郊区的油菜菌核病危害普遍,对产量影响很
In recent years, Shanghai suburb rape sclerotinia has been increasing year by year. During the five years from 1980 to 1984, the author investigated successively 64 communes (townships), 5 farms and 6 county-level agricultural institutes in 10 suburbs, 2 A county-level seed market, seven commune agricultural stations, 20 commune-level seed fields, a total of 1487 fields, 133477 strains of rape, the incidence of rape disease and disease index were found increased year by year. The average incidence was 2.05% in 1980, 0.61% in 81, 9.22% in 1982, 21.91% in 83 and 35.05% in 1984. The index of illness was 1.16 for 80 years, 0.37 for 81 years, 5.44 for 82 years, 14. 03 for 83 years and 16.43 for 84 years. From the 1960s to the mid-1970s, the sclerotinia sclerotiorum in the suburbs of Shanghai was widespread and its impact on the yield was very high