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Objectif: L’activite de butinage et de pollinisation des fleurs de Gossypium hirsutum (Malvaceae) par Apis mellifera Linne (Hymenoptera: Apidae) a ete observee a Garoua (Nord, Cameroun), afin d’evaluer l’impact de cette abeille sur le rendement fruitier et grainier de la plante. Methodologie et resultats: De juin a novembre des annees 2010 et 2011, 200 fleurs de G. hirsutum ont ete etiquetees et deux traitements formes selon la presence ou l’absence de protection vis-a-vis de Apis mellifera . Le comportement de butinage de l’Apide sur les fleurs, le taux de fructification, le nombre de graines par capsule et le taux de graines normales ont ete evalues. Les resultats ont montre que A. mellifera butinait de 6 h a 17 h et pendant toute la periode de floraison de G. hirsutum . A travers son efficacite pollinisatrice, A. mellifera a provoque un accroissement significatif du taux de fructification de 20,55 %, du nombre de graines par capsule de 26,21 % et du pourcentage de graines normales de 25,01 %. Conclusion et application des resultats: La pose des colonies de A. mellifera dans les plantations de G. hirsutum est recommandee pour augmenter la production des capsules et des graines. L’utilisation des pesticides est a eviter pendant la periode de floraison de la Malvacee. En cas de necessite, utiliser les pesticides les moins toxiques et a faible remanence pour les abeilles, puis les appliquer en dehors des tranches horaires d’activite de A. mellifera . Mots cles: Apis mellifera , Gossypium hirsutum , fleurs, pollinisation, rendements English Title: Pollination efficiency of Apis mellifera Latreille (Hymenoptera: Apidae) on Gossypium hirsutum (Malvaceae) at Djamboutou (Garoua, Cameroon) English Abstract Objective: Foraging and pollination activity of flowers of Gossypium hirsutum (Malvaceae) by Apis mellifera Linne (Hymenoptera: Apidae) have been observed in Garoua (North Cameroon), to determine the impact of worker bees on fruit and seed yields of this plant species. Methodology and results: From June to November 2010 and 2011, for each year, 200 flowers were labeled and divided in to two treatments, differentiated according to the presence or absence of protection against insect’s activities. The foraging behavior on flowers, the fructification rate, the number of seeds per pod and the normal seeds rate were evaluated. Results show that A. mellifera foraged on G. hirsutum flowers from 6 am to 17 pm and throughout the whole blooming period. Through its pollination efficiency, A. mellifera increased significant fructification rate in the order of 20.55 %, the number of seed yields per pod was 26.21 % and the percentage of the normal seeds was 25.01 %. Conclusion and application of results: The installation of A. mellifera colonies close to G. hirsutum field could be recommended to improve its pods and seeds production. Keywords: Apis mellifera , Gossypium hirsutum , flowers, pollination, yields

journal of applied biosciences

Efficacité pollinisatrice de &lt;i&gt;Apis mellifera&lt;/i&gt; Linné (Hymenoptera: Apidae) sur les fleurs de &lt;i&gt;Gossypium hirsutum&lt;/i&gt; (Malvaceae) à Djamboutou (Garoua, Cameroun)