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上海郊区油莱种植面积正在逐年增加,计划在“七五”期间将发展到120万亩左右。但近年来油菜病毒病的危害甚为猖獗,从1980～1986年的七年中,发病严重的年份就有4年,只有1982、1984和1986三年发病较轻。在重病年份平均发病率达到64.59%,有些田块发病率甚至高达100%。重病年份和轻病年份就同一品种来说,它们的产量差异是相当悬殊的。如1982年“沪油9号”油菜发病率为2%、病情指数为1.5,油菜籽亩产157.3
Shanghai suburbs oil rape planting area is increasing year by year, the plan during the “seventh five-year plan” will be developed to 120 million mu. However, the harm of rape virus disease is very rampant in recent years. From the seven years from 1980 to 1986, there were four years of serious disease and only mild incidence in three years of 1982,1984 and 1986. The average incidence of serious illness in the year reached 64.59%, the incidence of some fields even as high as 100%. Years of serious illness and years of mild illness, for the same species, their differences in production are quite significant. Such as the 1982 “Shanghai Oil 9” rape incidence of 2%, the disease index was 1.5, 157.3 acres of rapeseed