水稻灰飞虱在常熟市1年发生5～6代,主要作为虫媒传播条纹叶枯病为害水稻,其对水稻的直接为害一般不明显。2004年本市灰飞虱虫量逐代上升,至9月下旬至10月上旬水稻灌浆期出现第5、6代灰飞虱暴发。9月30日全市7个镇60块稻田调查,平均每667m2虫量为41郾45万头,其中支塘、古里、大 Laodelphax striatellus larvae were found in Changshu City for 5 to 6 generations a year, mainly as insect-borne rice stripe virus-infecting rice, its direct damage to rice is generally not obvious. In 2004, the population of Laodelphax striatellus increased from generation to generation, and the fifth and sixth generations of SBPH outbreak occurred in the grain filling stage from late September to early October. September 30 The city’s seven towns 60 paddy field survey, the average per 667m2 insect population of 41 郾 450,000, of which branch ponds, Guri, large