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Morphological variability of the baobab tree (Adansonia digitata L.) in Mali. Abstract — Introduction. Baobab (Adansonia digitata L.) is a typical agricultural landscape tree in semi-arid areas of Africa. It is a tree used daily by the local popu- lation. The diversity of its services and products suggests an assessment of its mor- phological variability to achieve a better understanding of its potential. This article seeks to identify morphological descriptors of baobab in relation to the agro-ecolog- ical diversity of Mali. Materials and methods. Eight provenances distributed over the whole geographical distribution area in Mali were evaluated for foliar, fruit and seed traits. The coefficient of variation was used to evaluate the variation. The data was analyzed by variance analysis and multivariate analysis. Results. Significant variability was observed according to the provenance, and the foliar, fruit and seed descriptors. The discriminating morphological descriptors for baobab in Mali are the fruit length and width, the fruit peduncle length, the leaf length and width, and the number of lobes. Mali / Adansonia digitata / fruits / leaves / site factors / production location

Le protocole vise a diagnostiquer, en laboratoire, les principales especes de Mycosphaerella pathogenes des bananiers et plantains. Les trois agents pathogenes Mycosphaerella fijiensis (anamorphe de Paracercospora fijiensis), M. musicola (anamorphe de Pseudocercospora musae) et M. eumusae (anamorphe de Pseudocercospora eumusae) sont respectivement responsables de la maladie des raies noires, de la maladie de Sigatoka et de la cercosporiose due a eumusae. Le principe, les principaux avantages, le materiel vegetal et le temps necessaires a la methode sont presentes. Materiel et methodes. Le materiel de laboratoire necessaire et le detail des treize etapes de realisation du protocole (prelevement des tissus et observations microscopiques in situ, isolement sur milieu artificiel et clonage d'isolats monospores, sporulation in vitro et observations microscopiques des conidies, conservation a long terme des isolats) sont decrits. Resultats. Le diagnostic est base sur les observations des anamorphes (conidiophores et conidies) qui peuvent etre observes directement a partir des feuilles de bananes ou apres sporulation des isolats mis en culture s'il n'y a pas de lesions sporulantes sur les echantillons de bananiers. (Resume d'auteur)