1980年以来.我县水稻品种布局和肥培条件改变,白背稻虱虫情加剧,主害代(第三代)的虫量,一般每穴50～60头,高的达百头以上,产量损失2～3成,已成为影响水稻高产的主要害虫。发生规律白背稻虱每年从南方稻区迁来我县繁殖为害。据1976～1985年灯下诱测记载,第一代成虫6月中、下旬始见,7月上、中旬出现1～ Since 1980, the distribution of rice varieties and the conditions of fertilizer and fertilization in our county have been changed. The insects of whitebacked planthopper are exacerbated. The amount of insect pests of the main pests (third generation) is generally 50 to 60 heads per hole and over 100 heads high, The loss of 2 to 3 percent, has become a major pest affecting rice high yield. Regular occurrence of white back louse annual migration from the southern rice area to my county breeding harm. According to the 1976-1985 light trap records, the first generation of adults in mid-June, late see, July, mid-1 ~