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Repellent Effect of Garlic against Stored Product Pests
G. K. M. Mustafizur RAHMAN and Naoki MOTOYAMA
J. Pestic. Sci.
25, 247-252 (2000)
Intact garlic clove, grated garlic and its volatile extract applied on brown rice showed a repellent effect but no insecticidal activity against two stored product pests, i.e. the maize weevil and the red flour beetle. Neither repellency nor insecticidal activity was observed with garlic or its extract against two agricultural pests, diamondback moth larvae and green peach aphids. In comparative tests, hot pepper and "wasabi" mustard demonstrated only weak repellency, if any, although volatile components of "wasabi" mustard showed insecticidal activity against these insects. Volatile components of garlic were trapped and subjected to GC-MS analysis. Four major peaks resolved were sulfide compounds produced by the rapid degradation of allicin and a cyclic compound produced by dehydration. It remains to be determined whether allicin itself, the degradation products, or the mixture of these are responsible for the repellent effect.
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