2001—2002年在苏州吴中区2个生长季节的田间观察和罩笼试验表明,白背飞虱Sogatella furcifera(Horváth)7月上旬以前迁入苏州,并在当地繁殖2代。从8月中下旬开始陆续有少量向外迁飞,9月份大田出现外迁高峰。田间白背飞虱起飞比率约为50%～65%,迁出峰期的每日迁出率约为80%。8月下旬白背飞虱一般已不构成危害。但20世纪90年代中期之后,白背飞虱8月份很少迁出而在迁入地大量滞留形成增殖代和主害代,危害时间大大延长,这与20世纪80年代的发生规律有了很大的不同。轨迹分析表明,8月中下旬从苏州迁出的个体中,40%可以到达江淮稻区,另有大约40%进入黄海和东海海域,若有强西南低空急流出现时则可跨海到达韩国和日本。9月份则主要是迁往我国的南方稻区,但很少可以直达岭南地区。 Field observations and cage experiments in two growing seasons in Wuzhong District of Suzhou in 2001-2002 showed that Sogatella furcifera (Horváth) migrated to Suzhou before early July and was bred for two generations in the area. From mid-to-late August, a small amount of outward relocation started to take off, and in September, there was a peak of relocation in Daejeon. The rate of white-backed planthopper take-off in the field is about 50% -65%, and the daily migration rate at the peak of the move-out period is about 80%. Whitebacked planthoppers generally do not pose a threat in late August. However, after the mid-1990s, white -backed planthoppers rarely moved out in August and remained in large numbers during their migration to form proliferating and dominating generations, greatly exacerbating the harm time, which is similar to that of the 1980s Big difference. Trajectory analysis shows that 40% of the individuals migrating from Suzhou in late August can reach the Jianghuai rice paddy area and about 40% of them enter the Yellow Sea and the East China Sea. If there is a strong southwest low level jet stream, they can reach South Korea and reach the sea level Japan. In September, the area was mostly relocated to the southern rice area of ​​our country, but seldom reached the Lingnan area.