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我地区位于长白山麓,是个山区,无霜期很不一致,最长的沿江流域有160天,最短的龙岗山顶只有70多天,一般在130天左右,每年只能栽培一季作物。7、8月份高温多雨。这样的地理和气候条件,比较适宜栽培玉米,也适宜于玉米螟的繁殖和为害。玉米螟是我区玉米生产的主要虫害,每年发生一个世代,以幼虫在寄主的根茬、茎秆、穗轴里越冬。一般在6月末开始化蛹,7月10日前后开始产卵,此时正是高温多湿季节,对其繁殖为害非常适宜。玉米螟的主要寄主作物玉米、高粱、谷子,占当地播种总面积的一半以上。这样的作物布局给玉米螟的繁殖、为害也造成了极为有利的条件,在我区是每年都有发生,特别近几年来随着种植密度的加大,施肥量的增多,为害也更加严重。
My area is located in the foot of Changbai Mountain, is a mountainous area, frost-free period is very inconsistent, the longest along the river basin has 160 days, the shortest Longgang Peak only 70 days, usually about 130 days, only one season of cultivated crops. July and August hot and rainy. This geographical and climatic conditions, more suitable for cultivation of corn, corn borer is also suitable for breeding and damage. Corn borer is the main pest of maize production in our district, one generation per year occurs, with the larvae wintering in the stubble, stalk and cob of the host. Usually in late June began to pupate, July 10 before beginning to spawn, this time is the hot and humid season, its reproduction is very appropriate. The main host corn borer corn, sorghum, millet, accounting for more than half of the total sown area. This crop layout to the corn borer breeding, damage has also caused very favorable conditions in our area is occurring every year, especially in recent years as the planting density increases, the amount of fertilizer increased, the damage is even more serious.