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油菜是湄潭县主要经济作物,1982年全县总产2196万公斤,比1980年最高年产量增产66.6％。但近几年来,不少农户播种面积不断增加,单产却不断下降。究其原因,我们认为病虫危害是主要因素。其中油菜菌核病的危害最为突出,每年全县因菌核病危害而减产约在45～80万公斤左右。因此我们对油菜菌核病发生原因作了调查分析和防治试验,现总结如下。 一、油菜菌核病发生的原因 调查结果表明,湄潭县油菜菌核病为害普遍而严重。如城关区双江乡,1982年总产21万公斤,1985年降到17.5万公斤,减产16.7％,该乡万家湾生产队蒋清云家,1980年播种面积5亩,总产650公斤,而1981～1985年,每年播种面积扩大为7亩,总产却依次降
Rape is the main cash crop in Meitan County. In 1982, the county’s total output was 21.96 million kilograms, an increase of 66.6% over the highest annual output in 1980. However, in recent years, many peasants have been increasing their sown area while their yields have been declining steadily. The reason, we believe that pest damage is the main factor. One of the most prominent rape sclerotiosis hazards, the county each year due to scab damage reduction of about 45 to 800,000 kilograms. Therefore, we conducted a rape sclerotisi on the causes of investigation and analysis of prevention and control experiments are summarized as follows. First, the rape sclerotinia causes The survey results show that the Meitan rape Sclerotinia common and serious damage. For example, Shuangjiang Township, Chengguan District, with a total output of 210,000 kilograms in 1982 and 175,000 kilograms in 1985, reduced by 16.7%. Jiang Qingyun, a Wanjiawan production team in the township, sowed an area of 5 mu in 1980 with a total output of 650 kilograms. From 1981 to 1985, the annual sown area expanded to 7 mu, but the total output went down