Insecticidal activity of the Thymus, Veronica and Agrimonia's essential oils against the cabbage aphid, Brevicoryne brassicae
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The insecticidal activities of essential oils obtained from each Thymus vulgaris, Veronica officinalis and Agrimonia eupatoria were investigated against the cabbage aphid, Brevicoryne brassicae (Homoptera: Aphididae) under laboratory conditions. All of the three tested essential oil had significantly reduced the daily fecundity of the cabbage aphid and caused higher mortality rates. In this study, essential oil extracted from T. vulgaris was found to be the most effective insecticide, as no adult apterous have managed to survive more than three days on the T. vulgaris oil that has been applied to the petri dishes. However, although, there was no dose-dependent significant effects of the three tested essential oils, there has been an important reduction in the reproduction potential when a 2 l dose of these oils has been applied. Exposure time to the applied essential oil had also an important effect, since daily fecundity of the cabbage aphid has generally decreased after 3 days in all of the treatments (except for control). The results obtained indicated that the three tested essential oils, particularly T. vulgaris oil that had the highest percentage of the monoterpene phenols; Thymol and Carvacrol, have had a great potential on cabbage aphid population control. © 2008 Akadémiai Kiadó.