玉米螟主要以幼虫蛀茎为害.致使玉米穗部发育不良,籽粒灌浆不满.茎秆在蛀孔处易被风折断,减产严重,1988年我省玉米螟大发生,据26个点冬前调查,平均百秆残虫量为155.4头,重的高达350多头,而一般年份仅为10—50头,据气象部门预报,今年5—6月份气候条件适宜玉米螟发生.全年玉米螟将大发生 Corn borer is mainly caused by the larvae ’s stems and stems, resulting in poor development of maize ears and unsatisfactory grain filling, and the stalks are easy to be broken by the wind at the wormhole, resulting in serious loss of yield. In 1988, corn borer occurred in our province, , The average amount of stems and stems of stems of 155.4, weight of up to more than 350 long, while the general year is only 10-50 head, according to the meteorological department forecast, May-June this year, the climatic conditions suitable for corn borer occurs. occur