水稻二化螟,以成虫钻蛀水稻茎杆为害,一般较轻年份损失5%左右,大发生年份损失20%以上。水稻二化螟发生程度有逐年加重的趋势,发生面积也逐年扩大,目前已成为我地区作物主要害虫之一。一、发生规律水稻二化螟在我地区每年6月上旬开始化蛹,6月中下旬为化蛹盛期,蛹期8-10天,6月下旬至7月上旬为羽化盛期,7月中下旬初孵幼虫开始集中为害叶 Chilo suppressalis, the adult borer borer rice stem damage, the general loss of about 5% of light years, the annual loss of more than 20%. The incidence of rice stem borer has increased year by year trend, the area has also expanded year by year, has now become one of the major crops in our region pests. First, the occurrence of regular rice Stem borer in our region in early June each year began to pupate, in mid-to late June for the pupation period, pupa 8-10 days, late June to early July for the emergence of the peak, July In early and late newly hatched larvae began to focus on the damage leaves