n African Entomology - Effect of neem derivatives on spotted bollworm sp. (Lepidoptera: Noctuidae) and its egg parasitoid, (Ishi) (Hymenoptera: Trichogrammatidae)

Volume 21, Issue 2
  • ISSN : 1021-3589



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 . 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 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 was not affected by any of the neem treatments. Similarly, the F progeny parasitized the bollworm untreated eggs normally and the emergence of F progeny was not affected by neem treatments. However, Polytrin-C® significantly reduced parasitism of the bollworm eggs by and adult emergence of the parasitoid.

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