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Les pesticides de synthese utilises dans la protection des cereales causent souvent d'enormes degâts sur la sante humaine et l’environnement. Pour limiter les mefaits dus a l'utilisation de ces produits chimiques, il est necessaire de trouver des methodes alternatives. A cet effet, les substances naturelles peuvent constituer une voie salutaire. L'objectif de ce travail est d'etudier l’effet de la balle de riz sur la mortalite et l'emergence de deux insectes ravageurs du riz, Sitophilus zeamais (Motsch.) et Tribolium castaneum (Herbst). Pour ce faire, deux poudres de balle de riz de granulometrie 0,3 et 0,5 mm ont ete chacune testees aux doses de 0,8 ; 1,2 ; 1,6 et 2,0% (m.m -1 ) sur des insectes adultes tandis que les cendres ont ete utilisees aux doses de 0,1 ; 0,2 ; 0,4 et 0,8%. L'actellic a ete utilise comme reference. Les resultats ont montre que S. zeamais etait plus sensible que T. castaneum aussi bien pour les cendres que pour la poudre dont l'efficacite dependait de la finesse des particules. Le dosage de la silice a revele une forte teneur dans les cendres, soit 88,76%, ce qui expliquerait leur grande efficacite, laquelle etait statistiquement egale a celle de l'actellic. Cette etude a montre que les cendres de balle de riz peuvent etre considerees comme une alternative a l’utilisation des insecticides chimiques dans la conservation des grains de riz au Senegal. © 2018 International Formulae Group. All rights reserved. Mots cles: Balle de riz, poudre, cendres, riz stocke, Sitophilus zeamais , Tribolium castaneum English Title:  Study of efficacy of powder and ashes from rice husk against two insects pests found in stored rice in Senegal, Sitophilus zeamais (Motsch.) and Tribolium castaneum (Herbst) English Abstract Synthetic pesticides used in the protection of cereals cause enormous damage on human health and environment. To limit the damage caused by the use of these chemicals, it is necessary to find alternative methods. For this purpose, natural substances can constitute a healthier way. The aim of this work is to study the effect of rice husk on mortality and emergence of two insects pests found in stored rice, Sitophilus zeamais (Motsch.) and Tribolium castaneum (Herbst). To do this, two powders of rice husk (0.3 and 0.5 mm) were each tested at doses of 0.8; 1.2; 1.6 and 2.0% (w.w -1 ) on adult insects while the ashes were used at doses of 0.1; 0.2; 0.4 and 0.8%. Actellic was used as a reference. The results showed that S. zeamais was more sensitive than T. castaneum for both powders and ash. It is also showed that the efficacy of a powder depend on the particles size. The silica assay revealed a high content in the ashes (88.76%), which could explain their high efficacy that was statistically not different to that of the actellic. This study showed that ashes of rice husk can be considered as a good alternative to chemical insecticides in the protection of stored rice in Senegal. © 2018 International Formulae Group. All rights reserved. Keywords: Rice husk, powder, ashes, stored rice, Sitophilus zeamais , Tribolium castaneum

international journal of biological and chemical sciences

Etude de l’efficacité de la poudre et des cendres de balle de riz contre deux insectes ravageurs du riz stocké au Sénégal, &lt;i&gt;Sitophilus zeamais&lt;/i&gt; (Motsch.) et &lt;i&gt;Tribolium castaneum&lt;/i&gt; (Herbst)