桑树不同季节施用杀虫剂虫螨腈对家蚕的残留毒性调查.pdf

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1、5CieI'lCeofSericulture2012，38(3)：0565—0570ISSN0257—4799；CN32—1115／SE—mail：CYKE@chinajourna1．net．cn桑树不同季节施用杀虫剂虫螨腈对家蚕的残留毒性调查佘柳涛薛卫东陆琴钱小兰(如皋市蚕桑技术指导站，江苏南通226500)摘要虫螨腈因其对家蚕的低毒性而成为桑树害虫防治药剂之一。为了确保桑园施用虫螨腈对家蚕的安全性，分别于春、夏、秋季对桑树喷施虫螨腈后，调查药剂对家蚕的残毒性及g-~~4中毒情况，结果表明不同季节桑树喷施虫螨腈对家蚕的残毒性差异较

2、大。夏季以24％虫螨腈悬浮剂3000倍稀释药液喷施桑树后3d采叶饲养对3龄期家蚕基本安全，1000、2000倍稀释药液喷施后5d采叶饲养对3龄期家蚕已无致死性；春季3种浓度药液喷施后7d采叶饲养仍造成3龄期家蚕100％死亡。夏蚕期3龄期家蚕饲喂1000倍稀释药液喷施后1h的桑叶后即出现中毒死亡，而中秋蚕期、春蚕期的3龄期家蚕食下相同毒叶分别在1、3d后才出现中毒死亡现象。此外，调查虫螨腈对不同龄期家蚕的残毒性，表明对5龄期家蚕的残毒性明显低于3、4龄期的家蚕，因此建议在家蚕4龄期之前尽量不用虫螨腈防治桑园害虫。关键词桑园杀虫剂；虫螨

3、睛；家蚕；残毒性；季节；龄期中图分类号$888．72文献标识码B文章编号0257—4799(2012)03—0565—06SurveyonResidualToxicityofInsecticideChlorfenapyrtoBombulberryFieldatVariousSeasonsSHELiu—TaoXUEWei—DongLUQinQIANXiao—Lan(RugaoSericulturalTechnologyGuideStation，NantongJiangsu226500，China)AbstractChlorfenapy

4、risoneofthemainpesticidesforcontrolofmulberrypestsduetoitslowtoxicitytosilkworm，Bombyxmori．Inordertoassurethesecurityofsprayingchlorfenapyrinmulberryfieldtosilkworm，theresidualtoxicityofchlorfenapyrtosilkwormIarvaeandpoisoningsymptomsofsilkwormlarvaewereinvestigatedaft

5、ersprayingchlorfenapyrinmulberryfieldinspring，summerandautumn．Theresultsindictedthattheresidua『toxicityofchlorfenapyrtosilkwormweregreatlydifferentindifferentseasons．The3000timesdilutedsolutionof24％chlorfenapyrproductwasgenerallysafetothe3rdinstarsilkwormlarvaeonthe3rd

6、dayaftersprayinginsummer，whilethe1000and2000timesdilutedso—IutionshadnoIethalitytothe3rdinstarsilkwormIarvaeonthe5thdayaftersprayinginsummer．MulberryIeavessprayedwiththeabovethreeconcentrationscouldstillcause100％mortalityofthe3rdinstarsilkwormlarvaeonthe7thdayafterspra

7、yinginspringInsummerrearingseason，deadlarvaeofthe3rdinstarwereobservedat1hafterfeedingonmul—berryleavestreatedwith1000timesdilutedsolutionofchlorfenapyr．whiledeadlarvaeappearedat1dinmid—autumnand3dinspringrespectivelyafterfeedingonmulberryleavesfromthesametreatment．Ina

8、ddition，theresidualtoxicityofchlorfenapyrtothe5thinstarsilkwormlarvaewasobviouslyweakerthanthattothe3rdand4thinstarla