Laboratory studies were conducted to investigate the toxic, growth-inhibiting and antifeedant/deterrent effects of neem derivatives on spotted bollworm and its effects on the parasitism potential and adult emergence of Trichogramma chilonis. Neem oil at 1, 1.5 and 2 % and neem seed water extract at 3 % concentrations not only significantly killed more spotted bollworm larvae but also reduced the number of surviving larvae that pupated. However, neem oil and neem seed water extract at 1 % did not affect adult emergence in the tested insect. Neem oil at 1.5 and 2 % and neem seed water extract at 3 % significantly reduced the number of larvae on treated leaves. Percentage parasitism of bollworm eggs by T. chilonis was significantly reduced when they were placed on leaves treated with 2 % neem oil, Polytrin-C® (40 % profenofos 4 % Cypermethrin) and 3 % neem seed water extract, but adult emergence of T. chilonis was not affected by any of the neem treatments. Similarly, the F1 progeny parasitized the bollworm untreated eggs normally and the emergence of F2 progeny was not affected by neem treatments. However, Polytrin-C® significantly reduced parasitism of the bollworm eggs by T. chilonis and adult emergence of the parasitoid.
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