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L’utilisation abusive des produits chimiques de synthese pose un probleme de sante publique. Afin de contribuer a la protection ecologique durables des cultures, les effets aphicides in vitro de l’huile essentielle de Ocimum basilicum L. une plante de la flore togolaise et son compose majoritaire, l’estragole, ont ete evalues sur les adultes du puceron Aphis gossypii. Les tests biologiques ont ete effectues en laboratoire selon la methode recommandee par Insecticide Resistance Action Commitee (IRAC) N° 1 Version 2. Les resultats obtenus ont revele que l’huile essentielle de O. basilicum et l’estragole ont montre une activite insecticide interessante sur les pucerons. La concentration minimale pour obtenir 100% de mortalite a ete de 3 μL.mL-1 pour l’huile essentielle et de 2 μL.mL-1 pour l’estragole. Les DL50 obtenues sont de 1400 ppm pour l’huile essentielle et de 700 ppm pour l’estragole. L’huile essentielle et son compose majoritaire se sont reveles efficaces in vitro avec un effet de toxicite plus elevee de l’estragole sur A. gossypii. Les tests en milieu reel et l’evaluation de leur innocuite sur les organismes non cibles seront necessaires pour confirmer l’interet de ces resultats dans l’elaboration d’une strategie de gestion integree a l’aide de ces pesticides naturels contre ce ravageur redoutable. © 2020 International Formulae Group. All rights reserved. Mots cles: Cotonnier, Aphis gossypii, Ocimum basilicum, huile essentielle, estragole English Title: Aphicide effect of the essential oil of Ocimum basilum L. and its majority compound on cotton aphid Aphis gossypii Glover (Homoptera: Aphididae) in Togo English Abstract The excessive use of synthetic chemicals is a public health issue. In order to contribute to sustainable ecological crop protection, in vitro aphicide effects of the essential oil of Ocimum basilicum L. a plant of Togolese flora and its majority compound, estragole, were evaluated on the adults of the aphid Aphis gossypii. Laboratory biological tests were conducted using the method recommended by the Insecticide Resistance Action Committee (IRAC) 1 Version 2. Results showed that essential oil of O. basilicum and estragole had interesting insecticidal activity on aphids. The minimum concentration to achieve 100% mortality was 3 μL.mL-1 for the essential oil and 2 μL.mL-1 for the estragole. Lethal Dose (LD50) values were 1400 ppm for the essential oil and 700 ppm for the estragole. The essential oil and its majority compound were effective in vitro with a higher toxicity effect of estragole on A. gossypii. Field tests and the evaluation of their safety on non-target organisms will be necessary to confirm the relevance of these results for an integrated management strategy development, using natural pesticides against this devastating pest. © 2020 International Formulae Group. All rights reserved. Keywords: cotton plant, Aphis gossypii, Ocimum basilicum, essential oil, estragole

international journal of biological and chemical sciences

Effet aphicide de l’huile essentielle de &lt;i&gt;Ocimum basilicum&lt;/i&gt; L. et de son composé majoritaire sur le puceron du cotonnier &lt;i&gt;Aphis gossypii&lt;/i&gt; Glover (Homoptera : Aphididae) au Togo