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随着本地区种植结构的调整,农田生态环境不断发生变化,农作物虫害种群结构亦在不断变化。今年5月份,我市降雨量偏多,气温偏低,瑞典绳的发育进度推迟,为害时间长,致使常年次要发生的害虫瑞典绳突发成灾,其来势之猛,为害之重,在我市尚属首次。今年我市玉米田瑞典绳发生面积达43万亩,占玉米播种面积的26%,严重发生面积20万亩,占发生面积的46%.据巩县孝义镇的调查,玉米苗被害株率为36.36～52.00%;荥阳县
With the adjustment of plantation structure in the region, the ecological environment of farmland constantly changes, and the structure of crop pest population is also changing. May this year, the city rainfall is too low, the temperature is low, the development of the Swedish rope delay, a long time of harm, resulting in perennial perennial pest Sweden rope catastrophe, the momentum of the fierce, the most serious damage in the The city is the first time. This year the city of corn fields in Sweden occurred 43 million mu of rope, accounting for 26% of maize sown area, a serious area of 200000 mu, accounting for 46% of the area occurred.According to the survey Gongyi County Xiaoyi town, corn seedling strain rate 36.36 ~ 52.00%; Shenyang County