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在湘鄂沿江地区,由于气候条件和栽培条件的适宜,给予褐稻虱Nilaprvata lugens Stal的发生与为害提供了有利的生态环境。尤其是7月中、下旬的主要迁入峰,它对迁入量的多少起决定性的作用,这一时期的迁入量占总迁入量的比重较大(70—80％),是当年为害程度轻重的决定因素,并且还直接对迟熟中稻造成突然性袭击。除此,还使为害双季晚稻的主要世代提早发生,重叠为害,造成防不胜防的被动局面。
In the areas along the Yangtze River, Hubei and Hubei provinces, due to the suitable climatic conditions and cultivation conditions, the favorable ecological environment for the occurrence and damage of Nilaprvata lugens Stal was given. Especially in the middle of July and the end of the main immigration peak, which determines the number of immigrants played a decisive role in the period of immigration accounted for a larger proportion of total immigrants (70-80%), is the year As a determinant of the magnitude of the damage, and also caused a sudden attack on late-maturing middle rice. In addition to this, the main generation of double cropped late rice is also harmed and overlapped, resulting in a passive situation that is hard to beat.