论文部分内容阅读
本文通过对食料、防治、肥料、耕作制度等对螟虫种群的发生影响较大的几个因子的分析,论述了攸县这个适宜种植杂交稻的双季稻区的螟虫十年内总的发生趋势和各年份内的发生趋势是:螟虫种群数量将略高于现在水平,但不会大发生;在螟虫种群内,二化螟仍保持绝对优势;三化螟发生轻微,只可苟且保留种群,但不会绝迹,大螟的发生仍维持现现,其每年发生量只占螟虫种群的8%以下。在各年份内,为害晚稻螟虫的发生相对较小,为害早稻则较大;为害迟熟早稻后期和晚稻苗期的二化螟发生量和为害程度较大,为害早稻苗期次
In this paper, the analysis of several factors that have a great influence on the occurrence of stem borers such as foodstuffs, prevention and control, fertilizers and tillage systems discusses the general trend of stem borers in double cropping rice in Youxian, The trend in each year is: the population of stem borers will be slightly higher than the current level, but not so much; within the stem borer population, the stem borer still maintains an absolute advantage; the stem borer occurs only slightly, Will not be extinct, the occurrence of Sesamia inferens still maintain the present, the annual occurrence of only about 8% of stem borer population. In each year, the incidence of late rice stem borers was relatively small, but the damage of early rice was larger; late rice and late rice had more occurrence and damage than the late rice,