经调查分析 ,2 0 0 1年上海地区水稻三化螟的暴发原因是由于螟虫越冬基数大 ,免耕栽培提高了越冬螟虫存活率 ,当年 3～ 5月雨量和雨日较常年少 ,有利越冬虫源化蛹、羽化 ,导致三化螟暴发危害。根据国内治理三化螟的新经验 ,结合本市发生特点 ,提出了治理策略和防治技术 The investigation and analysis showed that the outbreak of rice stem borer in Shanghai in 2001 was due to the large number of overwintering base of stem borers and no-till cultivation to increase the survival rate of overwintering stem borers. In March to May, rainfall and rain days were less than those of normal years, Insect source pupation, eclosion, leading to the outbreak of the three borers harm. According to the new experience of the domestic management of Borer, and combined with the characteristics of the occurrence of the city, put forward the management strategies and prevention and control technology