发生态势。当前,我国南方稻飞虱特大发生的态势已十分明朗,成灾的可能性增大。稻飞虱是一种迁飞性害虫,湖南、湖北、江西、江苏等稻区的稻飞虱虫源,主要从越南、华南等地由南向北迁飞,成为当地的主要侵染虫源。据资料介绍,今年越南稻区稻飞虱虫源基数高,4月中旬以来,越南中北部稻区田 Occurred situation. At present, the situation of the occurrence of rice planthoppers in southern China is very clear and the possibility of disaster is increasing. Planthopper is a migratory insect pests, the main source of planthoppers in Hunan, Hubei, Jiangxi, Jiangsu and other rice areas, mainly from Vietnam, South China and other places from south to north migrate, becoming the main source of local infestation . According to the introduction of information, this year, the rice planthopper population in the paddy field in Vietnam is high. Since mid-April,