Effects of neem-based insecticides on beet armyworm (Lepidoptera: Noctuidae) |
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摘 要: |
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关 键 词: | 甜菜夜蛾 植物源杀虫剂 印苦楝子素 印楝树 产卵 防治效果 棉花害虫 |
Effects of neem-based insecticides on beet armyworm (Lepidoptera: Noctuidae) |
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Authors: | SHOIL M GREENBERG ALLAN T SHOWLER TONG-XIAN LIU |
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Institution: | USDA-ARS APMRU, Weslaco, Texas, USA;Texas A&M University Agricultural Experiment Station, Weslaco, Texas, USA |
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Abstract: | Abstract Three commercial neem Azadirachta indica A. Juss (Meliaceae)]-based insecticides, Agroneem, Ecozin, and Neemix, and a non-commercial neem leaf powder, were evaluated for oviposition deterrence, antifeedant effect on larvae, and toxicity to eggs and larvae of the beet armyworm, Spodoptera exigua (Hübner) (Lepidoptera: Noctuidae), on cotton leaves in the laboratory. Oviposition deterrence in no-choice, and two- and fivechoice assays, was observed for the neem-based insecticide treatments when compared with a non-treated control. Neem-based insecticides also deterred feeding by beet armyworm larvae. Direct contact with neem-based insecticides decreased the survival of beet armyworm eggs. Survival of beet armyworm larvae fed for 7 days on leaves treated with neembased insecticides was reduced to 27, 33, 60, and 61% for neem leaf powder, Ecozin, Agroneem, and Neemix, respectively. Possibilities for adoption of neem-based insecticides in commercial cotton for beet armyworm control are discussed. |
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Keywords: | Azadirachtin beet armyworm cotton feeding oviposition deterrence Spodoptera exigua |
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