Effect of three commercial formulations includes Nimbecidine, NeemAzal T/S and Kofa from plant compound of neem on the biological stages of Trialeurodes vaporariorum (Hem.: Aleyrodidae) and its parasitoid, Encarsia formosa

Due to the effects of overuse of chemical pesticides and the residual problems in greenhouse products that threaten the health of consumers and exports, the use of low-risk alternatives such as plant compounds and biological agents has become necessary. Therefore, in this research, the effect of three commercial formulations of neem plant  (Azadirachta indica A. Juss.) composition, including Nimbecidine, NeemAzal T/S and Kofa was evaluated on the biological stages of Trialeurodes vaporariorum (Hem.: Aleyrodidae), and its parasitoid, Encarsia formosa Gahan. In evaluating the lethal effect of three commercial formulations, the highest lethal effect on eggs after 7 days related to Nimbecidine formula with LC50 equal to 774.71 ppm. The highest lethal effect on 3rd nymphal stage and adult whitefly after 72 hours with LC50 equal to 402.89 and 655.51 ppm in Nimbecidine formula were observed, respectively. A similar effect was obtained on parasitoid. In evaluating the oviposition preference of E. formosa for by choice and non-choice methods, the tendency of E. formosa to control was more than the formulas. The highest probability of oviposition of parasitoid in Kofa formula was observed (%42.66). The results of this study showed that all three formulas can be used in integrated management of this pest and when the emergence and use of E. formosa parasitoid, Kofa formula and in the absence of parasitoid, Nimbecidine formula is recommended.