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水稻是大洼县的主要粮食作物,种植面积达65万多亩。近年来,随着单位面积施氮量的增加及不利气候的影响,穗颈稻瘟病和稻曲病每年发病面积均达50％以上。为及时有效地控制病害蔓延和危害,我县从1985年起开展了大面积飞机航喷防治两病的作业,取得了较好的防治效果和经济效益。一、防治效果据1985—1987年调查统计,用航喷作业防治穗颈稻瘟病,平均防治效果为66.28％。与不施药的空白地块相比,结实率平均提高2.75％,千粒重平均增加0.61克、平均亩增产稻谷36.8公斤。据1986—1987年统计,航喷防治稻曲病,平均防治效果为80.45％。与对照相比,结实率平均提高1.9％,千粒重平均增加0.3克,平均亩增产24.6公斤稻谷。三年来,两病防治总
Rice is the main food crop in Dawa County, with a planting area of more than 650,000 mu. In recent years, with the increase of nitrogen application per unit area and unfavorable weather, the annual incidence of panicle blast disease and false smut disease reached more than 50%. In order to timely and effectively control the spread of diseases and hazards, our county since 1985 launched a large area aircraft jet prevention and control of the two diseases, and achieved good control effects and economic benefits. First, the control effect According to 1985-1987 survey statistics, the use of aerial spraying operations to prevent panicle blast, the average control effect of 66.28%. Compared with the blank plots without application of pesticides, the seed setting rate increased by 2.75% on average, the average grain weight increased by 0.61g, and the average mu yield increased 36.8kg of rice. According to statistics from 1986 to 1987, aerial spray prevention and control of rice false smut, the average control effect of 80.45%. Compared with the control, the seed setting rate increased by 1.9% on average, and the average grain weight increased by 0.3g. The average mu yield increased 24.6kg of rice. In the past three years, the two diseases have been controlled