Bemisia tabaci رﺴﺎﻟﺔ ﻋﻟﻤﻴﺔ أﻋدت ﻟﻨﻴل Ø¯Ø±ïº ïº” ا - جا٠عة تشرين

Unknownالصفحة [134] IX: تغييرتغيير رمز الحقلUnknownالصفحة [135] IX: تغييرتغيير رمز الحقلUnknownالصفحة [136] IX: تغييرتغيير رمز الحقلUnknownالصفحة [137] IX: تغييرتغيير رمز الحقل١١:٥٨:٠٠ ٢٠٠٨/٠٢/١٧ صwaeedالصفحة [138] :I منسّقالموضع:‏ أفقياً:‏ وسط،‏ نسبة إلى:‏ عمود٠٩:٠٩:٠٠ ٢٠٠٨/٠١/٠٣ مAbstractaliالصفحة ١: [١٣٩] محذوفA study on the population dynamics of cotton whitefly Bemisiatabaci Genn. (Homoptera: Aleyrodidae) was conducted on eggplant andtomato under different conditions through two seasons; 2004 and 2005.Generation numbers, host plants and natural enemies of whitefly weredetermined in coastal region of Syria.Biological studies including life-history parameters of B. tabaci andSerangium parcesetosum Sicard (Coleoptera: Coccinellidae) were carriedout on some host plants and at fixed temperatures.Evaluation of the Efficiency of the coccinellid S. parcesetosum incontrolling B. tabaci on eggplants in cages, greenhouse and open fieldwere achieved. In addition, we evaluated efficiency of the parasiteEretmocerus mundus Mercet. (Hymenoptera: Aphelinidae), alone andwith the predator together in controlling B. tabaci on eggplants in cages.Results showed that B. tabaci has eight generation per year, andspread in coastal region at elevations from 0- 1250 m above sea level, on8 host plants within 30 families. About 50% of adult population and76% of eggs settled on new leaves at top of plant, and 55.8% of newlarvae and 65.3 % of old larvae settled on middle and lower leaves,respectively.In open field, B. tabaci was noticed from mid May. The highestdensities were recorded in July and August. Its presence continued untilNovember. Population densities of B. tabaci in the greenhouse increasedsharply in comparison to open field when natural enemies or insecticideswere absent. 10 predators belonging to seven families were recorded onimmature stages of B. tabaci, and three species of parasite (E. mundus,Encrsia formosa and Encarsia sp.) (Aphelinidae) were also recorded onlarval and pupal stages. The Predator Dicyphus sp. (Heimiptera: Miridae)