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Un champ ensemence avec des semences de qualite peut se retrouver voisin avec un autre ensemence avec des semences infectees par le virus de la mosaique du niebe. Ce virus est transmis par les semences a des taux de 0 a 40% selon les varietes. Ces semences infectees donnent des jeunes plantes virosees a partir desquelles les pucerons vont propager la maladie. Ce travail a ete effectue pour determiner la distance minimale permettant d’eviter des contaminations a partir d’inoculum externe suivant la sensibilite de la variete. Ainsi, deux parcelles centrales de 300 m 2 ont ete semees avec des graines de Gorom local contaminees a 0,5% par le virus. Autour de la premiere parcelle centrale, 4 parcelles de 200 m 2 chacune ont ete semees avec des graines de Gorom local indemnes de virus aux distances respectives de 10 m, 15 m, 20 m et 25 m. Autour de la deuxieme parcelle centrale, des semences indemnes de virus de Kvx61-1 ont ete utilisees. Un dispositif similaire a ete constitue pour les parcelles temoins avec des semences indemnes de virus. La propagation de la maladie a montre qu’elle est liee a la variete, aux pucerons et a la distance avec la source d’inoculum. © 2015 International Formulae Group. All rights reserved. Mots cles: Semences indemnes de virus, semences contaminees, distance minimale, pucerons English Title: Study of the effect of external inoculum source on CABMV ( Cowpea aphid – borne mosaic virus ) spread in relation to the proximity of neighboring plots and the cowpea variety English Abstract A field sown with quality seeds can be closed to another one sown with seeds infected by cowpea mosaic virus which is seed transmitted at rates ranging from 0 to 40% depending on cowpea varieties. Infected seeds germinate and grow into virus-infected seedlings from which aphids will spread the disease. This  research was carried out in order to determine the minimum distance needed for avoiding contaminations from external virus inoculum sources, in relation with the susceptibility of cowpea varieties. Thus, two central plots of 300 m² have been sown with contaminated seeds at 0.5% by CABMV of cowpea variety Gorom local. Around the first central plot, four plots of 200 m² each were sown with virus-free seeds of Gorom local at respective distances of 10 m, 15 m, 20 m and 25 m. Around the second central plot, virus-free seeds of Kvx61- 1 have been used. A similar layout was done for the control plots with virus-free seeds. It was found that the spread of the disease was related to the cowpea variety, the aphids and the distance from the inoculum source. © 2015 International Formulae Group. All rights reserved. Keywords: Virus-free seeds, contaminated seeds, minimum distance, aphids

international journal of biological and chemical sciences

Etude de l’effet d’une source d’inoculum externe sur la propagation du CABMV (<i>Cowpea aphid – borne mosaic virus</i>) selon la proximité des parcelles voisines et la variété de niébé

Etude de l’effet d’une source d’inoculum externe sur la propagation du CABMV (Cowpea aphid – borne mosaic virus) selon la proximité des parcelles voisines et la variété de niébé