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บทคัดย่อ

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Abstract

Common cutworm (Spodoptera litula Fabricius) is an insect pest which widely spread and damaged the many important crops in Thailand. The purpose of this research was to study the effect of crude extract from Suicide Tree (Cerbera odollam Gaerth.) on control of the third instar larva of common cutworm. The insecticidal efficacy against common cutworm larva was tested using Leaf dipping method and Topical application method. The result showed that at 30% (w/v) of Suicide Tree fruit crude extract displayed strong antifeedant activity, whereas the lower concentration and Suicide Tree leaf crude extract had no effect. In addition, the percentage of mortality from the Suicide Tree fruit crude extract at the concentration of 1, 5, 10 and 30% were 13.33, 80.00, 93.33 and 100% respectively, with LC50 value at 24 hour was 2.68+0.37%. From our results, it was interesting to note that the Suicide Tree fruit crude extract has a strong insecticidal efficiency and should be applied further for control of insect pest.