棉卷叶野螟的生物学与防治

Studies on Bionomics and Control of Sylepta dorogata Fabricius

棉卷叶野螟是绿篱植物——木槿的重要害虫。在福建大田,室内饲养1年发生5～6代,野外世代重叠,每代历期31～47天,以老熟幼虫在地上或草丛中结薄茧越冬,翌年5月上旬开始出现笫1代幼虫,10月下旬部分老熟幼虫开始越冬,部分继续发育为下代,直至12月中旬才越冬。幼虫6龄,卷叶为害,在室内对2～6龄幼虫喷洒90％的敌百虫晶体3000或5000倍液,80％敌敌畏3000或5000倍液和2.5％溴氰菊酯5000或10000倍液,田间用2.5％溴氰菊酯乳油5000倍液喷洒,均有良好防治效果。

The Sylepta dorogota Fabricium is a serious pest of the hibiscus. There are 5-6 generations per year in the laboratory in Da-Tian,Fujian province. In the fields generation after generation are overlapped,each lasting 31-47 days, and abult larves spend the winter inside thin coccons in the soil or in clumps of weeds. The first generation occures in early-May of the next year and larvae become harmful to the hibiscus. Some adult larvae begin to overwinter in later-October. The other go into next generation until middle-Decemble, the time to overwinter. There are six larvae instars, and do harm by curling leaves of the plant. The result from the experimen show that it is very effective to spray with Dipterex, Dichlorphos, Phoxim, Decamefhrin for controling the instar larvae at the age 2 to 6.