Migration of cotton whitefly, Bemisia tabaci (Gennadius), (Homoptera: Aleyrodidae) between various host plants and its population changes

re Migration of Cottom ¥hltef Ijt B®aîsis t Betweea ¥arloiîs Hoşt Plaırts aad îts Popu l at l oa Clbtaag-es Th© ssasonai f luctuatloa. of cattcra whiteflyf jSejHisia taöaci CGeımadiiis), OH vartaya hoşt piants, mîgratioa f ram oma îsost t o aaotîaer, and. tfes factors effectlag1 the saîgration wers stadied.. Popuiatioas of 5, ta&sci started to aigrate froıs cottoa fIsîds to overwintering Î3.osts by fail, and laiâ nuu^rous ©ggs on CistMS spp. âltaugb very slows iiîEsature stages coatînued to de ve l öp ®nd cver^latered on Cîstas spp.. Adiîit esaergeEce( dstermiDsd fey yellovr sticky traps.were effsctsd by eavironasntal coaditîoîîs aad took place betMeen lats February to Âpril. First adult ssergeace in agrîcultural areas >ras detsraiBad to bs 2-4 weslcs after esssrgsnce af adults af overwlatering: populatlons. ânatîıer overwinterîug hoşt of B. tsbaci wss Mvbu& fructicosııs L., but populatîons of 13, t&ib&cl Kas ver y lcw on tfeis hoşt. âdıslts of overwiat©ring popu l at i ons îaigrsted to ths agricultural areas and infected early crops sucîı as potato (Solanum tuberosum L.>s cucuıabsr of tne cottoa fields were very si zil l ar... Jo reiatîoa was fouad betîfsea tfae popu l at i on deasîtîes of whitefly on cottoa snd abseacs ör presence of spring Jsosts near and/or aesct to cotton fîeld. âaoısg tîse veg-etatoles cultureâ duriBg- sprlsg-, "bean f pepper (.C^psicısa SUBIWS L>, eggplant < Sol anam aelasg-ss^ L, >s and toaato (Lycapersicos escvlsnt^s Mili.) did not show any svldsace of being sourcs of iafectloB. but the popuîatîoa deasity ^?as consiâerably îîîglî. on eggplant. ¥eed îıosts showed very low populatîon densitîes earîy î B tîıe seasoa5 only XsatMuz psızsylvsınîcum L. îsad higîısr densitîes tfeaa otîıer wild hosts duriag t&e sussuısr.