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1、昆虫学报ActaEntomologicaSinica,August2008,51(8):889-894ISSN045426296幼虫密度对甜菜夜蛾生长发育与繁殖的影响1,21,321,33王娟,江幸福,吴德龙,罗礼智(11中国农业科学院植物保护研究所,植物病虫害生物学国家重点实验室,北京100193;21江西农业大学农学院,南昌330045)摘要:为了研究甜菜夜蛾Spodopteraexigua(Hübner)幼虫的密度对其发育及繁殖的影响,本实验观察了5种幼虫密度下(1,5,10,20,30头P瓶),幼虫发育和成虫繁殖情况
2、。结果表明:幼虫和蛹历期、存活率和蛹重均差异显著。幼虫和蛹历期均以20头P瓶的最短,1头P瓶的最长,其余随幼虫密度增加而延长;幼虫至蛹存活率以10头P瓶的最高,其余随幼虫密度增加而降低;1头P瓶的蛹最重,显著高于其他密度的,其余随幼虫密度增加而下降。尽管密度间成虫羽化率和产卵前期均无显著差异,但成虫产卵量、寿命和畸形率差异显著。1头P瓶的产卵量最多,其次为10头P瓶的,其余随幼虫密度增加而减少,30头P瓶的产卵量显著少于其他密度的;密度在1～20头P瓶范围内,雌蛾寿命均较短,显著短于30头P瓶的,而雄蛾寿命以5头P瓶的最短,
3、显著短于其他密度的(10头P瓶除外),10头P瓶的次之,其余密度间差异不显著;不同幼虫密度下羽化的成虫畸形率差异显著,10头P瓶的最低,其余随幼虫密度增加而升高;生命表结果表明甜菜夜蛾在10头P瓶下世代存活率和种群增长指数均最高,幼虫密度过低或过高均不利于2种群增长;世代存活率(S)和种群增长指数(I)与幼虫密度之间的关系均呈抛物线关系:S=-012087x+215694x222+211152(R=0188),I=-010552x+019166x+541168(R=0195)。结果提示幼虫密度影响甜菜夜蛾种群动态的重要生态因
4、子之一。关键词:甜菜夜蛾;幼虫密度;生长发育;繁殖;生命表中图分类号:Q968文献标识码:A文章编号:045426296(2008)0820889206Effectoflarvalrearingdensityondevelopmentandfecundityofthebeetarmyworm,Spodopteraexigua(Lepidoptera:Noctuidae)1,21,321,33WANGJuan,JIANGXing2Fu,WUDe2Long,LUOLi2Zhi(11StateKeyLaboratoryforBio
5、logyofPlantDiseasesandInsectPests,InstituteofPlantProtection,ChineseAcademyofAgriculturalSciences,Beijing100193,China;21CollegeofAgronomy,JiangxiAgriculturalUniversity,Nanchang330045,China)Abstract:Toinvestigatetheeffectoflarvaldensityonpost2embryonicdevelopmentand
6、adultreproductionofSpodopteraexigua,weconductedalaboratoryexperimentinwhichlarvaewererearedatdifferentlarvaldensities(1,5,10,20and30larvaePjar).Thelarvalandpupaldevelopmentaltime,survivalandpupalweightweresignificantlydifferent.Individualsrearedatthedensityof20larv
7、aePjarshowedtheshortestlarvalandpupaldevelopmentaltime,whilethelongestlarvalandpupaldevelopmentaltimeoccuredinindividualsunderisolatedconditions(1larvaPjar).Inotherrearingconditions,bothlarvalandpupaldevelopmentaltimeincreasedwiththelarvaldensityincreasing.Thesurvi
8、valratefromlarvaetopupaewasthehighestatthedensityof10larvaePjar,whileitdecreasedwiththelarvaldensityincreasing.Pupalweightwassignificantlydiffere
