Abstract
Fumigant toxicity of five plant volatile oils viz., ginger oil (Zingiber officinale), patchouli oil (Pogoste moncablin), garlic oil (Allium sativum), cinnamon oil (Cinnamomum zeylanicum) and lemon oil (Citruslimon) were evaluated at 0.01%, 0.05%, 0.1%, 0.5% and 1.0% concentrations against the egg, larva, adult of the pulse beetle Callosobruchus maculatus along with their effect on the oviposition. The results revealed that the fumigant toxicity indicated by the lowest egg hatching of 10% was observed with 1.0% concentration of C. zeylanicum and Z. officinale; also, maximum larval mortality of 90% was observed. The adult mortality was 90% with C. zeylanicum oil at 1.0% and 72.50% with Z. officinale oil at 1.0%. C. zeylanicum and Z. officinale at 1.0% concentration also resulted in minimum oviposition of 3.00 and 4.25 eggs, respectively in contrast to 74 to 78 eggs in untreated control.
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