简析三化螟灾变规律及其综合治理对策陈玉托杨永雄（广东省农业厅植保总站广州５１０５００）三化螟是我省水稻的主要害虫之一。一般年发生４代，南部地区发生５代，以一、三代为害早、晚稻苗期和二、四、五代为害早、晚稻孕穗至灌浆期为主。苗期受害造成水稻枯心苗，中期... Analysis of the catastrophe of the rice stem borer and its comprehensive control Chen Yu-tor Yang Yong-xiong (Plant Protection Station, Guangdong Provincial Department of Agriculture, Guangzhou 510500) Borer is one of the major pests of rice in our province. Generally occurs four generations in the southern region occurred five generations to one or three generations of early damage, late rice seedling and two, four, five generations of early damage, late rice booting to the filling stage. Seedling damage caused by rice seedlings, medium-term ...