تقييم تاثير المفترس Serangium paracesetosum Sicard Coleoptera: Coccinellidae و المتطفل Eretmocerus mundus Mercet Hymenoptera: Aphelinidae في السيطرة على ذبابة القطن البيضاء Bemisia tabaci Genn. (Homoptera: Aleyrodidae) على نباتات الباذنجان ضمن الاقفاص

This study was conducted to evaluate the efficiency of the predator Serangium Parcesetosum Sicard to control Bemisia tabaci Genn. on eggplants in open field. Dynamic changes in B. tabaci populations on eggplant in response to S. parcesetosum were monitored. S. parcesetosum were introduced at 30 adults at the end of July. The number of whitefly stages decreased from about 39 eggs, 52 larvae / 1 cm2 leaf in the middle of August to 1 egg and 2.7 larvae/ 1 cm2 at the beginning of October. The difference was significant. The density of the coccinellid larvae reached the peak at the end of August (average 4.93, range 2-42 larvae per plant). The number of predator adults reached the peak at the beginning of October (average 11.4 adult, range 1-48 per plant). The percentage of parasitization by Eretmocerus mundus Mercet (Hymenoptera: Aphelinidae) decreased from 15.2% in the middle of August to 0.48% at the beginning of October; whereas mortality (result the predator and other factors) increased from 11. 45 to 98.54% in the same period. 25%, 50% and 25% of eggplant were cleaned from immature of B. tabaci by action of predator in August, September, and October respectively. Our data suggest that the serangium may work well in biological control program for b. tabaci on eggplants in the open field.