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Lethal effects of spinosad and azadirachtin on the cotton leafworm, spodoptera littoralis (BOISD.) (lepidoptera: noctuioae) [electronic resource]

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Hatem, A. E

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Language: English Summary language: Arabic Description: p.273-282Other title:

تأثير الجرعه المميته لكلا من سبينوساد وأزاديراكتين على دودة ورق القطن [Added title page title]

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Annals of agricultural science, 2008 v. 53 (1) [electronic resource].

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In: Annals of agricultural science 2008.v.53(1)Summary: Laboratory experiments have been conducted to determine the lethal effects of Spinosad and Azadirachtin on the cotton leafworm, Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae) larvae by a diet incorporation bioassay. Newly molted third instar larvae were exposed through ingestion to different concentrations. Larval mortality of S. littoralis increased with the concentration resulting a LC₅₀ values of 1.38 µg/ml and 0.14 µg/ml for, Spinosad and Azadirachtin respectively, the mortality times decreased with the concentration Increase. Sublethal effects were studied by treating of third instar larvae with a concentration equivalent to the respective LC₅₀. Both insecticides significantly increased larval development period from treatment until pupation, but the effect of Azadirachtin was greater than pinosad.

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Laboratory experiments have been conducted to determine the lethal effects of Spinosad and Azadirachtin on the cotton leafworm, Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae) larvae by a diet incorporation bioassay. Newly molted third instar larvae were exposed through ingestion to different concentrations. Larval mortality of S. littoralis increased with the concentration resulting a LC₅₀ values of 1.38 µg/ml and 0.14 µg/ml for, Spinosad and Azadirachtin respectively, the mortality times decreased with the concentration Increase. Sublethal effects were studied by treating of third instar larvae with a concentration equivalent to the respective LC₅₀. Both insecticides significantly increased larval development period from treatment until pupation, but the effect of Azadirachtin was greater than pinosad.

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