The Effect of Different Products from the Neem Tree Azadirachta indica A. Juss. on the Hatchability of the Eggs of the Whitefly Bemisia tabaci (Genn.) (Homoptera: Aleyrodidae)

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Himat, Munthir Towfeeg Mohamed
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This work was carried out in the entomology laboratory of the Dept. of Crop Protection, Faculty of Agriculture in the period from March to May 2002. The major objective was to test the effect of different neem products mainly NeemAzal-T/S® and Celaflor® as commercial neem pesticides, and neem seed water extract and neem oil as locally produced formulations, on the hatchability of the eggs of the whitefly Bemisia tabaci. NeemAzal-T/S® and neem oil were used each at different three concentrations mainly 2m/L, 5m/L and 8m/L. Celaflor® was used at 1m/L, 4m/L and 7m/L. Neem seed water extract was used at 25g/L, 50g/L and 75g/L. Statistical analysis showed that different concentrations of neem seed water extract reduced the hatchability of eggs by 20, 15 and 12.5% respectively while the control was 10%. The reduction caused by NeemAzal-T/S® were 17, 15 and 13% respectively and that caused in the control was 10%. Neem oil concentrations reduced the eggs hatchability by 38, 79 and 74% respectively while the reduction in the control was 32%. Three doses of Celaflor® caused reductions by 3, 24 and 22% respectively and the reduction in the control was only 1%. The statistical analysis showed that the highest efficacy was caused by neem oil which reduced the hatchability by 56% followed by NeemAzal-T/S® by 41% and neem seed water extract by 27%. There was practically no significant effect attributed to Celaflor® which reduced the hatchability by 17% compared with the control which was 13%.
July 2004
Neem Tree, tabaci