灰稻虱在上海地区一年发生五至六代。越冬代若虫一般年份在3月份羽化为成虫,产第一代卵于三麦和绿肥田的看麦娘及其他禾本科杂草上,卵在4月中下旬开始孵化。第一代若虫绝大部份仍在上述越冬寄主上生长发育。部分迁入附近的二熟制、三熟制早稻秧田和玉米田,带毒虫将病毒传给水稻和玉米。第一代成虫99%以上是长翅型,于5月下旬(早的年份在5月中旬末)羽化,5月下旬末至6月上旬进入羽化高峰。在麦收前后大量迁移到早稻本田、迟播早稻秧田、单季稻 Gray pest occurs in Shanghai for five to six generations a year. Overwintering nymphs in the general year of emergence in March as adults, producing the first generation of eggs in the three wheat and green fields to see the mother and other gramineous weeds, eggs in mid-April hatch. Most of the first generation nymphs are still on the above winter host growth and development. Part of the move into the vicinity of two cooked, three cooked early rice seedling and corn fields, with poison worm spread to rice and corn. More than 99% of the first-generation adults were long-winged and emerged in late May (early mid-May) and reached the peak of emergence in late May and early June. In the wheat before and after a large number of migrated to early rice Honda, late sowing early rice seedling, single-season rice