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期 刊 ：植物保护学报 2005年

关键词：稻纵卷叶螟；成灾原因；栽培制度；气候因素；

Keywords:Cnaphalocrocis medinalis, outbreaks, cultivation system, climate factor,

摘 要 ：稻纵卷叶螟是沿江稻区水稻上的重要害虫。自本世纪以来,第4代稻纵卷叶螟对水稻穗期的危害日趋严重。通过室内试验和大田系统调查,对沿江稻区第4代稻纵卷叶螟暴发机制进行了探讨。结果表明,目前该稻区粳稻面积已占水稻播种面积的70%左右,粳稻生育期较籼稻迟15天左右,饲养在武育粳3号(粳稻)上的稻纵卷叶螟其蛹重、羽化率、成虫寿命和产卵量分别较协优(籼稻)高40.6%、54.5%、24.5%、82.3%。可见,食料丰富和营养条件改善是导致第4代滞留危害的重要原因之一。另外,秋季持续高温和化学防治的负面效应,对第4代虫量的增加也有较大的影响。

Abstract:Cnaphalocrocis medinalis (Guenée) is a major rice pest in Yangtze River Area of Jiangsu Province.Previous researches suggest that the pests of the fourth generation (emergence from late Aug.to early Sept.) in the area emigrate and dont damage rice plants. But the damages caused by the pests of the fourth generation to rice plants at heading period are serious in recent years.The mechanisms behind the damage were studied through field surveys and lab experiments.The results indicated that the rate of planting area is 70% for the varieties of japonica rice in the area in 2003,which the growth period is prolonged by 15 days or so.The weight of pupae, rate of emergence, life span of adults and fecundity per-day of C.medinalis on Wuyujing 3 (japonica rice) were higher with 40.6%,54.5%,24.5% and 82.3% than that of Xieyou 136,respectively.The outbreak of the fourth generation C.medinalis in the area was mainly attributable to the changes of dominant rice varieties.In addition,the warmer autumn (>27 ℃ during mid and late August) and adverse effects of insecticides on natural enemies enhanced the field population of the fourth generation in the area.The forecast and control of the fourth generation C.medinalis were discussed in this paper.

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