Abstract
Abstract: Two constituents of essential oils, carvacrol and thymol, were tested for their effects on the feeding activity, oviposition preference and oviposition rate of Frankliniella occidentalis and Thrips tabaci. Given a choice between treated and untreated leaf discs, F. occidentalis avoided ovipositing on leaf discs treated with 1 or 0.1% thymol. In no‐choice experiments, 1 and 0.1% thymol and 1% carvacrol resulted in a reduced oviposition rate of F. occidentalis compared with the control. Both constituents caused a slight reduction of the feeding damage of F. occidentalis. 1 and 0.1% carvacrol had a pronounced deterrent effect on the oviposition site selection of T. tabaci. Both constituents served as anti‐ovipositants for both thrips species, albeit F. occidentalis was more affected than T. tabaci.
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