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1991年10月中旬在大新县晚稻田第七代稻飞虱成虫密度突然急剧增加,虫量大的稻田百丛有虫达8万多头,使防治工作措手不及,十多天时间就有许多正在抽穗灌浆的稻田出现稻株倒伏“落窝”或稻穗枯白的现象,发生程度为中等偏重,局部大发生,发生面积7.64万亩,占晚稻面积的47.27％,其中严重受害上万亩,绝收2025亩,造成严重减产。根据我县第六代稻飞虱的发生情况以及10月份的田间、灯诱虫量和天气变化情况分析,这批成虫系北方虫源,在南迁时遇冷暖气流峰面而随降雨迫降我县,并在适宜的环境条件下作短期滞留为害。主要依据如下:
In mid-October 1991 in Daxin County, the seventh generation of rice planthopper in Daxin County, a sudden sharp increase in population density, large quantities of pests in paddy field hundred pests of more than 80,000, so that prevention and control work by surprise, there are many more than 10 days In the heading paddy rice paddy appeared lodging “fall litter” or rice withered white phenomenon, the occurrence of moderate to moderate partial occurrence occurred, an area of 7.64 hectares, accounting for 47.27% of the area of late rice, of which a serious damage on the mu , 2025 acres absolutely, resulting in serious cuts. According to the occurrence of the sixth generation of planthopper in our county and the field, light-induced insect population and weather changes in October, these adults were the northern source of the cold, County, and in the appropriate environmental conditions for short-term stay harm. The main basis is as follows: