2001-2006年邗江稻区二化螟发生规律及其危害情况

The Occurrence Law and Damage Condition of the Rice Stem Borer in 2001-2006 in Hanjiang Rice Area

根据2001-2006年扬州市邗江稻区二化螟调查测报资料,统计分析了该种群的发生规律及其危害情况。结果显示,6 a间整个稻区二化螟一、二代蛾盛发期多出现于5月中旬和7月下旬,蛾和卵高峰期具多峰现象;2001-2003年越冬残留和一代幼虫量及螟害率变化一致,其余3 a间一代和冬后残留幼虫量变化相反,仅与一代螟害率一致,其中2003年螟害发生最重。研究还表明,除去外源因素影响,二化螟冬后残留和一代幼虫量高低可评估当年螟害率及预测翌年该虫发生程度。

Based on the investigation materials of the rice stem borer（Chilo suppressalis Walker） in Hanjiang rice area from 2001 to 2006,the occurrence law and damage condition were analyzed in the paper.The results showed that the occurrence peak periods of the adults of the rice stem borer of the first and second generation usually were in the middle of May and last decade of July,respectively.Many peaks of adult and egg were found in the present study.The change of the number of the larvae of postwintering was more or less conformable with those of the first gene-ration and the damage rate during 2001-2003.But the change was opposite between the number of the larvae of postwintering and that of the first generation during 2004-2006.The highest damage rate occurred in 2003.The research suggested that the change of the numbers of the larvae of postwintering and the first generation was consistent with the damage rate that year,and it might be used to predict the occurrence conditions of the rice stem borer next year.