Abstract
The toxic effects of vapours of essential oils of Acorus calamus (L.) rhizomes obtained from three countries on the adults and eggs of Callosobruchus phaseoli (Gyllenhal) reared on seeds of Lablab purpureus (Medik.) were studied. All oils were toxic to adults and eggs depending on exposure period and dose. Indian oil showed a strong latent effect, while an acute effect was more dominant in the Yugoslavian oil, followed by Russian oil. Significant reduction of oviposition was found in Yugoslavian and Russian oil vapours at 5 and 10 μl oil per 400 ml jar after 24 h exposure. Longer exposure periods increased the differences in egg production of treated and untreated insects. The fertility of the treated females was little affected. Newly-laid eggs were more susceptible than older ones, Indian oil vapours were the most effective.
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