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一、发生实况稻纵卷叶螟是南宁地区稻作区主要的迁飞性害虫之一,1990年该虫第三代在全地区范围内特大发生,发生面积达192.78万亩,占早稻种植面积的86.49%,是1989年同代的2.03倍,据自治区植保总站对该虫的分级
First, the occurrence of live rice leafroller is Nanning rice area is one of the main migratory pests, the third generation of the pest in 1990 in the region within a particularly large area, the occurrence of an area of 192.78 hectares, accounting for the area planted with early rice 86.49%, 2.03 times that of the same generation in 1989, according to the grading of the pest at the plant protection station of the autonomous region