Effect of some pest control agents on whitefly Bemisia tabaci, Gennadius infesting two potato cultivars
2010
Abd Allah, A.A.A. | Ghatwary, W.G.T. | Hashem, M.S.
Efficacy of detergent soap (Sulphonic acid), two novel insecticides (Nomolt 15% SC and Mospilan 20% SP), one traditional insecticide (Evisect 50% SP), in addition to natural oil (Naterlo 97%) and three botanical insecticides (Zanzalacht fruit extract (Melia azadirach), Datura fruit extract (Datura stramonium) and Damsissa herb extract (Ambrosia maritime L.)] was estimated on sweet potato whitefly, Bemisia tabaci (nymphs and adults) and its associated parasitoids and predators on two potato cultivars,. Data revealed that sulphonic acid was the best control agent against the tested whitefly recording the highest percentage of adults killing during the most inspection dates, whereas it can be reduced the acidity of leaf surface, which providing antifeedent conditions for whitefly. Sulphonic acid caused % reduction in population of B. tabaci adults ranged between 80.74-65.01%, while natural oil induced the highest % reduction in population of whitefly nymphs ranged between 78.6 - 63.59%. Datura fruit extract and Mospilan exhibited acceptable initial and good residual effects against the two stages of whitefly during both seasons, while Nomolt, Evisect and Zanzalacht fruit extract recorded relatively moderate influence ranged between 62.35 to 44.69% reduction against the two stages of insect. On the other hand, the effect of treatments on natural enemies harboured the two potato cultivars were differed from onecompound to another where Zanzalacht fruit extract was the most safe. In respect to the yield, there were significant differences between the experimental treatments which treated with Sulphonic acid at 1st and 2nd seasons,respectively. Damsissa recorded the lowest yield at 2nd season (134.5 kg/P1o)
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