Abstract

The direct toxicity of four essential oils, Majorana hortensis Moench, Ros­marinus officinalis L., Mentha piperita L. and Lavandula officinalis Chaix, to adult females of the predacious mite Amblyseius swirskii Athias-Henriot were tested. Peppermint oil was the most toxic to females A. swiriskii while the French lavender oil was the least toxic to the pre­dator. All essential oils, at the two concentrations used, decreased the food consumption rate as well as egg laying. All four materials tested, at con­cen­tration 0.25% were considered to be safe for the predator since no mortalities had been recorded.

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