Antifeedant Effects of Essential oil of Mentha longifolia subsp. longifolia L. HUDSON (Lamiaceae) on Subcoccinella vigintiquatuorpunctata L. (Coleoptera: Coccinellidae)

Antifeedant activity of essential oils obtained from Mentha longifolia subsp. longifolia L. HUDSON (Lamiaceae) against S. vigintiquatuorpunctata (Coleoptera: Coccinellidae) adults that are collected from Ordu were tested in Turkey. In general, protection of plants against pests is performed using chemical insecticides, However the use of chemical insecticides on control of the insects creates serious risks on the ecosystem. Lately, scientists are focused on studies about using essential oils obtained from plants (phytochemicals) as alternatives to chemicals insecticides for pest control. Similarly essential oils obtained from M. longifolia subsp. longifolia L. was prepared in 5 different doses (312.5, 625, 1250, 2500 and 5000 ppm). As a result, essential oils obtained from M. longifolia subsp. longifolia L. were seen to have strong antifeedant effects. It were determined positive correlation (r = 0.733, P < 0.005) between increasing concentrations of the essential oils obtained from Mentha longifolia L. and AFI indices. The AFI value reached a maximum at 5000 ppm. The AFI value for 5000 ppm is 71.88 ± 6.4. Additionally, chemical composition of essential oil of M. longifolia subsp. longifolia leaves were determined by GC-MS analysis. The main component of essential oil of M. longifolia subsp. longifolia was 2-Cyclohexen-1-one (39.58) and second one was p-Menthone (16.97%).