Fecundity and fertility inhibition effects of some plant essential oils and their major components against Acanthoscelid
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ORIGINAL ARTICLE
Fecundity and fertility inhibition effects of some plant essential oils and their major components against Acanthoscelides obtectus Say (Coleoptera: Bruchidae) Athanase Hategekimana1,2 · Fedai Erler2 Received: 7 January 2020 / Accepted: 28 February 2020 © Deutsche Phytomedizinische Gesellschaft 2020
Abstract Fecundity (egg production) and fertility (egg hatchability/progeny production) are important components of both sexual and asexual reproduction of insects. Some plant essential oils (EOs) are reported to be active inhibitors against various insect pests by reducing or completely hindering their fecundity and fertility. The present study was carried out to determine the inhibitory effects of three plant EOs [eucalyptus (Eucalyptus camaldulensis Dehn.), peppermint (Mentha piperita L.) and anise (Pimpinella anisum L.)] and their major components (1,8-cineole, L-menthol and trans-anethole, respectively) on egg-laying and progeny production of bean weevil, Acanthoscelides obtectus Say (Coleoptera: Bruchidae), which is an economically important pest of common bean, Phaseolus vulgaris L. (Fabaceae), in tropical and subtropical regions. The EOs were extracted by hydro-distillation, and their chemical composition was determined by gas chromatography–mass spectrometry. The oils and components were bio-assayed via fumigation against the pest by exposing newly emerged virgin females and young males to the median lethal concentration (LC50) of each material for 10 h. After the exposure, the surviving individuals were mated in the following combinations; treated females × treated males (TF × TM), untreated females × treated males (UF × TM), treated females × untreated males (TF × UM), untreated females × untreated males (UF × UM). According to the results, the highest fecundity inhibition was observed in TF × TM with 86.05%, 71.9% and 55.72% for anise, eucalyptus and peppermint oils, respectively. In addition, the highest progeny production inhibition was seen in the TF × TM combination with 93.3%, 68.0% and 44.9% after exposing to eucalyptus, anise and peppermint oils, respectively. Overall the results showed that the exposure of newly emerged adults by the median lethal concentration of EOs and their major components negatively affected the egg-laying and progeny production of bean weevil. These results may also pioneer new approaches in insect pest control of stored products. Keywords Essential oil · Component · Bean weevil · Fecundity and fertility inhibition · Stored-product insect pest
Introduction The global human population increase is one of the world challenges (Hall et al. 2017). It is argued that the worldwide total population growth to 9.1 billion by 2050 will necessitate sufficient production of food crops to meet the food needs of the population (Godfray et al. 2010). However, food * Fedai Erler [email protected] 1
Rwanda Agriculture Board (RAB), P.O. Box 5016, Kigali, Rwanda
Department of Plant Protection, Faculty of Agriculture, Akdeniz University, 07070 Antalya, Turkey
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