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Alectra vogelii (benth) is parasitic weed which causes significant yield reductions in cowpea ( Vigna unguiculataWalp ) in Africa. The objective of this study was to identify the type of gene action controlling the trait for resistance to Alectra vogelii in cowpea and estimate the heritability of the trait. Seven genotypes of cowpea were mated in half diallel and their F2 progeny, including parents, were evaluated for reaction to Alectra vogelii infection in the field in two locations at Ilonga and  Hombolo Agriculture Research Stations. Highly significant (P < 0.001) differences were found for Alectra emergency and infestation at Ilonga. General combining ability (GCA) and specific combining ability (SCA) effects for Alectra shoot emergency and infestation were significant (P < 0.05). The estimate of Baker’s ratio for Alectra shoot emergency and infestation were 0.62 and 0.66, respectively. This indicates that both additive and non-additive gene actions influenced the trait for resistance to Alectra emergency and infestation. Narrow sense heritability estimates were 41.28 and 44.39 for shoot and emergency, respectively. These results imply that introgression of a desirable trait in an elite genotype would involve careful crossing with a resistance genotype, accompanied by selection in the advanced population. Key Words : Alectra vogelii , gene action, Vigna unguiculata Alectra vogelii (benth) est une herbe parasite qui engender des reductions  significatives dans les rendements du niebe ( Vigna unguiculataWalp ) en Afrique. L’objectif de la presente etude etait d’identifier le type d’action de gene controllant la resistance a Alectra vogelii chez le niebe et d’estimer les valeurs d’heritabilite. Sept genotypes de niebe ont ete croises selon le mode half diallel et leurs descendants F2, ainsi que les parents, ont ete evalues pour leur reaction face a ‘linfestation en plein champs du Alectra vogelii dans les stations de recherche agricole de Ilonga et Hombolo. Des differences tres significatives (P < 0,001) ont ete observees pour l’emergence, la croissance vegetative et l’infestation de Alectra a Ilonga. L’habilete a la combinaison generale (GCA) et specifique (SCA) pour l’emergence, la  croissance vegetative et infestation de Alectra etaient significative (P < 0,05). les valeurs du ratio de Baker pour l’emergence, la croissance vegetative et l’infestation de Alectra etaient respectivement de 0,62 et 0,66. Ceci indique que les deux effets de gene; additif et non-additif sont responsables de la resistance a l’emergence, la croissance vegetative et a l’infestation de Alectra. Les valeurs de l’heritabilite au sens strict etaient respectivement de 41,28 et 44,39 pour la croissance vegetative et l’emergence. Ces resultats indiquent que l’introgression d’un caractere desirable dans un genotype elite necessiterait des croisements avec un genotype resistant, suivi de selection au cours des generations avancees. Mots Cles : Alectra vogelii , action de gene, Vigna unguiculata

Nature of resistance of cowpea <I>Alectra vogelii</I> infestation