2004年灰飞虱犤Laodelphaxstriatellus(Fallen)犦在姜堰市大发生,是历史记载最重的1a。据系统监测,全市麦田冬前平均虫量5.6头/m2,4月上旬12.4头/m2,是大发生2003年同期的2倍多;5月中旬812.7头/m2,是2003年同期的14倍。带毒率测定,越冬代47.9%(2003年37.5%),一代35.6%(2003年24 2004 Laodelphax striatellus (Fallen) 犦 occurred in Jiangyan City, is the history of the most important 1a. According to the system monitoring, the average number of insect pests in wheat fields before the winter in the city was 5.6 heads / m2, with 12.4 heads / m2 as early as in April, more than twice that of the same period in 2003 and 812.7 / m2 in mid-May, 14 times of the same period in 2003 . With the rate of poisoning, overwintering generation 47.9% (37.5% in 2003), generation 35.6% (2003 24