论文部分内容阅读
根据１９９０～１９９３年调查研究和探讨，玉米螟为害玉米，随虫量增加，产量下降、千粒重降低。因玉米螟钻蛀造成玉米茎秆折断，下部折断比上部折断损失重，当百株玉米有玉米螟卵２２块时可成活玉米螟幼虫２０头，其造成的为害与上部茎秆因玉米螟为害２０株折断或下部茎秆６株折断，所造成的玉米产量损失相仿，都与防治所需费用相等。高于这个标准就应进行防治。
According to the investigation and research from 1990 to 1993, the maize borer was damaged by maize borer. With the increase of the number of insects, the yield decreased and the 1000-grain weight decreased. Broken corn stalk caused by corn stalk break, the lower part of the broken than the upper breaking weight loss, when a hundred corn corn borer eggs can live 22 corn borer larvae, the damage caused by the upper stem damage caused by corn borer 20 broken or lower stem 6 broken, resulting in loss of similar corn production, and control costs are equal. Higher than this standard should be prevention and treatment.