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二化螟是我省水稻上一种主要害虫。水稻苗期受害,形成枯鞘、桔心;孕穗、抽穗期受害,彤成枯孕穗、白穗和虫伤株,对产量影响太。该虫分布面广,但过去主要在丘陵山区和滨湖地区发生较多,为害较重。近年来,为害范围逐渐扩大,发生数量呈上升趋势,有的稻区过去二、三化螟并发,以三化螟为主,现逐渐转变为二化螟为主。经初步调查分折,认为杂交水稻的大面积推广,改善了二化螟的种群环境条件,是近年来二化螟普遍上升的主要原因之一。
Chilo suppressalis is a major pest on rice in our province. Rice seedling victims, the formation of dry sheath, orange heart; booting, heading damage, tung blight into booting, white spikes and insect pest strains, the impact of yield too. The worm is widely distributed, but in the past it mainly occurred in the hilly and mountainous regions and in the lake and lake areas, causing serious damage. In recent years, the scope of the damage gradually expanded, the number of occurrence is on the rise, and some rice in the past two or three Borer concurrent to three stem borer, now gradually transformed into striped stem borer. Based on the preliminary investigation and analysis, it is considered that popularization of hybrid rice has improved the population environmental conditions of the rice stem borer, which is one of the main reasons for the general increase of the rice stem borer in recent years.