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Toxicity of some recommended insecticides in sugarcane and cotton fields to Trichogramma evanescens West [electronic resource].

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Barakat, A. A

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Language: English Summary language: Arabic Description: p.111-118Other title:

سمية بعض المبيدات الموصى بها في مزارع قصب السكر والقطن للتريكوجراما ايفانسنز [Added title page title]

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Agricultural research journal, Suez Canal University, 2008 v.8(1) [electronic resource].

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In: Agricultural Research Journal, Suez Canal University 2008 v.8(1)Summary: The potential effects of five different insecticides; kz oil 95% EC, malathion 57% EC, challenger 36% SC, admiral 10% EC and spintor 24% SC, which are used in sugarcane and cotton fields, on some bioaspects of the egg parasitoid Trichogramma evanescens West have been studied. KZ oil 95% EC inhibited emergence of T evanescens when the recommended concentration or less were used. Malathion 57% EC at concentrations of 0.44, 0.88, 1.75 and 2.5 mVL (recommended rate) decreased emergence of adult paras ito ids to 65.8, 52.3, 24.4 and 16.4 %, respectively, while it reached in the control treatment 73.8%. Malathion did not only shorten longevity of emerged adult parasitoids, but also decreased the fecundity of emerged female parasitoids. Challenger 36 % SC decreased percentage of emerged parasitoids and shorten their longevity to an average of 0.6 ± 0.42 day when the recommended concentration was tested. Admiral 10% EC at concentrations of 0.063, 0.125, 0.25 and 0.5 mVL (recommended rate) had no effect on emergence, longevity of adult parasitoids or on fecundity of emerged parasitoid females. In contrary, spintor 24% SC had a drastic effect on emergence and longevity of T. evanescens even when it is use~ at the lowest concentration. This harsh effect makes its use in crop fields released with the parasitoid questionable.

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The potential effects of five different insecticides; kz oil 95% EC, malathion 57% EC, challenger 36% SC, admiral 10% EC and spintor 24% SC, which are used in sugarcane and cotton fields, on some bioaspects of the egg parasitoid Trichogramma evanescens West have been studied. KZ oil 95% EC inhibited emergence of T evanescens when the recommended concentration or less were used. Malathion 57% EC at concentrations of 0.44, 0.88, 1.75 and 2.5 mVL (recommended rate) decreased emergence of adult paras ito ids to 65.8, 52.3, 24.4 and 16.4 %, respectively, while it reached in the control treatment 73.8%. Malathion did not only shorten longevity of emerged adult parasitoids, but also decreased the fecundity of emerged female parasitoids. Challenger 36 % SC decreased percentage of emerged parasitoids and shorten their longevity to an average of 0.6 ± 0.42 day when the recommended concentration was tested. Admiral 10% EC at concentrations of 0.063, 0.125, 0.25 and 0.5 mVL (recommended rate) had no effect on emergence, longevity of adult parasitoids or on fecundity of emerged parasitoid females. In contrary, spintor 24% SC had a drastic effect on emergence and longevity of T. evanescens even when it is use~ at the lowest concentration. This harsh effect makes its use in crop fields released with the parasitoid questionable.

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