大稻缘蝽(LeptocorisaacutaThunberg)在南丹县历年轻发生,不造成大的损失,但1997年在迟熟中稻田局部发生严重。发生面积333.3hm2,占种植面积的3.7%,减产一般20%～30%,严重的达50%～60%,损失粮食120万Kg。　　9月上旬在车河镇的骆马村、芒场镇的芒场村、八圩乡的关西村等地调查, Leptocorisaacuta Thunberg occurs young in Nandan County without causing great losses, but in 1997, it occurred locally in late-maturing mid-season paddy fields. Occurred area 333.3hm2, accounting for 3.7% of the planting area, the general reduction of 20% to 30%, a serious 50% to 60%, loss of food 1.2 million Kg. In early September, Chevalong Village in Chebei Township, Mangchang Village in Mangchang Town and Kansai Village in Baduxiang County were surveyed.