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以人工接卵方法研究夏玉米小黄品种乳熟到完熟阶段玉米螟幼虫数量与产量的相关,得知虫口密度与产量损失呈直线相关。单株每增加幼虫1头,百株产量损失0.17斤,损失百分率为0.89%,影响极小。如按每亩2300株计,在上述玉米生育阶段内无虫时的产量436斤,单株平均有虫1头时,每亩损失约4斤。作者初步认为:北京地区夏玉米使用颗粒剂一次防治螟害,在玉米较早生育期(如心叶末期或开花授粉期)施药,效果应优于在卵高峯前后施药。
The method of artificial egg retrieval was used to study the correlation between the number of larvae and the yield of corn borer in the millet ripening stage of summer maize. It was found that there was a linear correlation between the population density and yield loss. Each additional one larvae per plant, one hundred strains lost 0.17 pounds, the loss percentage was 0.89%, with minimal impact. For example, according to 2300 plants per acre, the production of 436 jins without insect at the above-mentioned stage of maize growth will cause about 4 kg loss per mu when there is an insect per plant on average. The authors preliminary believe that: the use of summer maize granules in Beijing once the prevention and control of pests, maize early growth period (such as late leaf or flowering pollination) application, the effect should be better than before and after the egg application.