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1979～1983年在郑州采用田间笼罩接虫和大田调查的方法,进行了穗期稻纵卷叶螟危害损失的研究。试验资料经协方差分析导出:虫量(X)与卷叶率(R)之关系式为:R=0.95+0.082X±0.77;卷叶率(R)与损失率(Y)之关系式为:Y=-13.09+21.69lgR±3.99;虫量(X)与损失率(Y)之关系式为:Y=-30.92+20.63lgX±4.65在经济允许损失水平为2%时,其防治指标为百丛三龄幼虫40～50头,卷叶率为5%,并根据各地经济允许损失水平和所用农药种类的防效不同,建立了计算防治指标的数学模型。
From 1979 to 1983, the method of harvesting and field investigation in the field in Zhengzhou was used to study the damage of rice leaf roller at the heading stage. The experimental data were derived from the covariance analysis. The relationship between the amount of worm (X) and the leaf volume rate (R) was: R = 0.95 + 0.082X ± 0.77; the relationship between the leaf volume rate (R) and the loss rate : Y = -13.09 + 21.69lgR ± 3.99. The relationship between the amount of insects (X) and the loss rate (Y) is: Y = -30.92 + 20.63lgX ± 4.65 When the economic allowable loss level is 2% The third instar larvae of 40 to 50 larvae, leaf curl rate of 5%, and according to different levels of economic allowable loss and pesticide species used in different control efficiency, the establishment of a mathematical model to control indicators.