A clear antifeedant activity
against the onion thrips was found by application of the
essential oil of marjoram Depending on the oil
concentration from 0.01% to 1% the silver damage on
the treated leaf discs was reduced between 91.8% and
93.9% compared to the untreated control leaf discs Lavender oil did not deter onion thrips females at
the lowest 0.01% concentration, but significantly
reduced feeding damage at 0.1% and 1% solution