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1、....页眉抗虫棉—玉米间作对昆虫种群动态的影响摘要为探究抗虫棉与玉米间作对棉田害虫及其天敌种群动态的影响，采用3点取样法，自2013年6月3日至10月11日，每5天调查一次间作棉田及对照棉田的主要害虫及其天敌的种群数量。调查结果表明：抗虫棉玉米间作不利于部分非靶标害虫的发生，尤其是对棉叶螨、斑须蝽、盲蝽和潜叶蝇的抑制作用较明显，种群数量明显减少，且发生平稳，没有大的爆发；而对粉虱、棉叶蝉、棉蚜、蓟马、跷蝽的作用不明显，只是数量上间作棉田比单作棉田略微减少；间作模式下棉铃虫的落卵量显著减少，但棉铃虫幼虫和成虫数量却高于单作棉田。玉米间作可以增加棉田天敌数量，尤其是草蛉、龟纹瓢虫和异色瓢
2、虫的表现最突出，发生量明显高于单作棉田；蜘蛛类天敌数量略多于单作棉田，食蚜蝇数量与单作田持平，小花蝽却少于单作棉田。从总体上说，抗虫棉与玉米间作可以有效减轻抗虫棉田害虫的发生，增加天敌种群数量，可以作为一种有效的种植模式在大田推广。关键词：抗虫棉，玉米，间作，种群动态....页脚.....页眉EFFECTSOFINSECTRESISTANTCOTTONANDCORNINTERCROPPINGONTHEPOPULATIONDYNAMICSOFINSECTSABSTRACTTostudytheeffectofinsect-resistantcottonandcornintercroppin
3、gonthepopulationdynamicsofinsectsandnaturalenemies,thisexperimentbeganinApril15.By3pointsamplingmethod,fromJune3,2013toOctober11,eachthe5dayinvestigatedthepestsandnaturalenemypopulationsofintercroppingcottonandthecontrolofcotton.Thetestresultsshowedthat:thecottonintercroppingcornwasnotconducivet
4、osomenontargetpests,especiallyoncottonspidermites,Dolycorisbaccarum,Miridaeandleafminer,whichhappenedsmoothlyandnomajoroutbreaks,withthepopulationdecreased.But,theeffectsofwhiteflies,leafhoppers;cotton,cottonaphid,thrips,stiltbugswerenotobvious,justthenumberofintercroppingcottondecreasedslightly
5、thanmonoculturecotton;Theeggsofintercroppingcottonweresignificantlydecreased,butthenumberoflarvaeandadultswashigherthanmonoculturecotton.Intercroppingcorncouldincreasetheamountofnaturalenemies,especiallytheprominentlacewing,Propylaeajaponica,andHarmoniaaxyridis,whoseoccurrencewassignificantlyhig
6、herthanmonoculturecotton.But,spiderspecies,numberwasslightlymorethanmonoculturecotton,andSyrphidae,snumberdonotchange,andOriueswaslessthanmonoculturecottonfield.Fromsayonthewhole,insect-resistantcottonintercroppingcorncouldeffectivelyreducetheinsectresistant....页脚.....页眉cottonpests,andincreasedn
7、aturalenemiespopulation,itcouldbeusedasaneffectiveplantingmodeinfieldapplication.KEYWORDS:insect-resistantcotton,corn,populationdynamics,intercropping....页脚.....页眉目录摘要IABSTRACTII目录IV第一章文献综述11.1抗虫棉概述11.2当前抗虫棉所面临的的问题21.3间作对棉花害
