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  • Title: Anti-termitic activities of essential oils from coniferous trees against Coptotermes formosanus.
    Author: Cheng SS, Chang HT, Wu CL, Chang ST.
    Journal: Bioresour Technol; 2007 Jan; 98(2):456-9. PubMed ID: 16495050.
    Abstract:
    In this study, the anti-termitic activities of 11 essential oils from three species of coniferous tree against Coptotermes formosanus Shiraki were investigated using direct contact application. Results demonstrated that at the dosage of 10 mg/g, the heartwood and sapwood essential oils of Calocedrus macrolepis var. formosana and Cryptomeria japonica and the leaf essential oil of Chamaecyparis obtusa var. formosana had 100% mortality after 5 d of test. Among the tested essential oils, the heartwood essential oil of C. macrolepis var. formosana killed all termites after 1 d of test, with an LC(50) value of 2.6 mg/g, exhibiting the strongest termiticidal property. The termiticidal effect of heartwood essential oil was due to its toxicity and its repellent action.
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