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Öğe Determination of chemical composition and fumigant insecticidal activities of essential oils of some medicinal plants against the adults of cowpea weevil, callosobruchus maculatus(Kahramanmaraş Sütçü İmam Üniversitesi, 2018) Kaya, Kamuran; Sertkaya, Erdal; Üremiş, İlhan; Soylu, SonerChemical composition and fumigant insecticidal activities of essential oils obtained from oregano Origanum syriacum L.), lavender (Lavandula angustifolia L.), sage (Salvia officinalis L.,), fennel (Foeniculum vulgare Mill.) and laurel (Laurus nobilis L.) plants were investigated against the adults of cowpea weevil, Callosobruchus maculatus (F.) (Coleoptera: Bruchidae). Based on GC-MS analysis, total number of compounds determined in oregano, lavender, sage, fennel and laurel essential oils were 25, 33, 23, 23, 42, respectively. Carvacrol (66.66%), trans-anethol (79.17%), 1,8- cineole (50.0%), camphor (30.46%) and linalyl acetate (35.66%) were found as the most abundant compounds, respectively. Bioassay results revealed that essential oils, at 30.0 or 40.0 µg ml-1 air, resulted in 100% adult mortality of C. maculatus. Insecticidal activity was increased in response to increased concentration of essential oil. Among the essential oils tested, oregano showed the highest fumigant toxicity at relatively lower concentration (30.0 µg ml-1). Complete adult mortality (100%) caused by fennel, laurel, sage and lavender essential oils at the concentrations of 40.0 µg ml-1 air. The LC50 and LC90 values for each essential oil were estimated by using probit analysis. The lowest LC50 value was estimated for sage essential oil (8.79 µg ml-1) followed by oregano (11.17 µg ml-1), lavender (11.64 µg ml-1), laurel (13.59 µg ml-1) and fennel (17.46 µg ml-1), respectively. The results revealed that plant essential oils might be used in research aiming the development of new environmental friendly control agents against stored-product pests such as cowpea weevil.
