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以不同的测定方法对本省不同世代区玉米螟为害玉米产量损失的研究表明,一代区和不完全二代区采用大样本单测回归法。一代区玉米单株每增加1头幼虫,单株产量损失3.48克,损失率2.65％。不完全二代区玉米单株每增加1头幼虫,单株产量损失3.78克,损失率3.0％。二代区采用改进的小区对比法。第一代1头幼虫,产量损失率5.15％;第二代1头幼虫,产量损失率2.35％;一、二代混合,1头幼虫产量损失率3.38％。以玉米螟产量损失为依据,提出了一代和不完全二代区的防治指标及二代区的防治策略。
The results of different methods used to determine the yield loss of maize borer in different generations in this province show that the first generation and the second generation are large single sample regression. For each additional one-year-old larva in the first generation of corn plants, the yield per plant was 3.48g and the loss rate was 2.65%. Incomplete second generation of maize plants for each additional one larvae, the yield loss of 3.78 grams per plant, the loss rate of 3.0%. Second generation district using improved cell contrast method. The first generation of one larvae, the yield loss rate of 5.15%; the second generation of a larva, the yield loss rate of 2.35%; one or two generations of mixed, a larvae yield loss rate of 3.38%. Based on the yield loss of corn borer, the control index of the first generation and the second generation, and the control strategy of the second generation were proposed.