近几年来,我省大面积推广杂交稻以后,三化螟为害有回升的趋势,在杂交稻田越冬的虫口密度亦明显增多。越冬三化螟的虫口密度及其越冬状态是考察三化螟种群数量变动的重要依据。本研究选择粤北地区有代表性的杂交稻品种“威优六号”,并以常规品种“双桂一号”作对比。调查两品种越冬三化螟田间虫口密度,测定越冬幼虫的体重、体内粗脂肪含量、 In recent years, large-scale popularization of hybrid rice in our province, the resistance of the three yellow rice borers have picked up the trend of overwintering hybrid rice fields also significantly increased the population density. The population density of Overwintering stem borer and its overwintering status are the important bases for investigating the population change of the rice stem borer. In this study, a representative hybrid rice variety “Weiyou 6” in northern Guangdong was selected and compared with the conventional variety “Shuanggui No.1”. The population density of overwintering three barramundi was investigated, the body weight of overwintering larvae, crude fat content in the body,