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Population Dynamics Investigation Of Whiteflies On Greenhouse-grown Vegetables In Baoji

Posted on:2015-04-07Degree:MasterType:Thesis
Country:ChinaCandidate:M J ZhongFull Text:PDF
GTID:2283330434465119Subject:Plant protection
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Bemisia tabaci and Trialeurodes vaporariorum are notorious pests worldwide. In theprotected areas in Northern China, the whiteflies usually mixedly occur and do harm together,causing tremendously economic losses annually. By far, chemical control has been the principalweapon used for management of the whiteflies, but the extensive use of insecticides causesenvironmental pollution, human health problem and insecticide resistance. Therefore, exploringalternative management method for these two pests is extremely urgent.In our experiment, we carried out population dynamics investigation of Bemisia tabaci andTrialeurodes vaporariorum in greenhouse-grown tomatoes in Baoji in2013. The main findingsare shown below:(1) The seasonal growth and decline of whitefly population showed a bimodal type curvechange, including the summer peak which lasted longer and was bigger, and generally appearedin early July to late August. The autumn peak was shorter and smaller, which mainly occured inlate November to middle December. After that, from mid to late December, the whiteflypopulations were declining rapidly, then turned to winter.(2) The population dynamic of the eggs and numphs of whitefly was consistent throughoutthe season, also showed a bimodal type curve change. Specific occurrence rule and that ofpopulation quantity was basically identical. The peak of whitefly eggs comes first, then thenymphs also appeared, the date they appear10-20d after the egg peak.(3) Yellow sticky board monitoring of whiteflies. The results showed that seasonal growthand decline of whitefly populations showed a bimodal type curve change, including the summerpeak which lasted longer and was bigger, and the autumn peak was shorter and smaller. Specificwhitefly population dynamic and that of system investigation is relatively consistent.(4) There were significant differences between the peak numbers of whiteflies among thethree treatments. The plants covered by the nets had fewer whiteflies than those that were not covered by the nets.(5) We can monitor the population dynamic of pests using yellow sticky board ingreenhouse vegetables in practical production.
Keywords/Search Tags:Bemisia tabaci, Trialeurodes vaporariorum, population dynamic, yellow boardmonitoring, system investigation
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