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Objectifs: A partir de 2014 une epidemie de deperissement de manguiers et d’agrumes s’est declenchee dans la partie centrale du Togo. Cette etude a ete entreprise en vue de determiner le pathogene responsable et d’identifier un pesticide permettant de lutter contre la maladie. Methodologie et resultats: Une prospection a permis la collecte des echantillons de tissu de plantes malades. Les champignons pathogenes potentiels ont ete isoles de ces tissus par culture sur PDA et PDA amende avec des extraits de manguier. Fusarium solani , Phoma glomerata (27,78 et 16,67% des tissus etudies) et Lasiodiplodia theobromae ont ete isoles mais ce dernier etait le plus frequent et present dans 83,33% des tissus etudies. Cinq fongicides disponibles sur le marche local ont ete testes. La symptomatologie de la maladie et la frequence dans les tissus malades ont permis d’identifier L. theobromae comme responsable du deperissement des manguiers et des agrumes. Tous les fongicides bloquaient la germination des spores de L. theobromae . Le fongicide binaire Banko Plus contenant du carbadazim inhibait le mieux la croissance de L. theobromae . Conclusion: La lutte contre l’epidemie se resume au controle de L. theobromae . Dans un premier temps, l’incorporation du Mancozeb au milieu de culture avant son insemination a ete plus efficace suivi dans l’ordre par celle du Callomil, du Jumper, du Callicuivre et du Banko Plus. Ce traitement pourrait permettre la prevention de la maladie par blocage de la germination des spores. Deuxiemement, dans le cas de l’aspersion de suspensions de fongicide sur les colonies en croissance sur PDA, le Banko Plus a donne le meilleur resultat. La combinaison de Banko Plus comme fongicide systemique et du Mancozeb comme fongicide de contact devrait permettre la lutte contre le deperissement du manguier et des citrus au Togo. Mot clef: Deperissement, Lasiodiplodia theobromae , fongicide systemique, Manguier, Citrus English Title:  Dieback of mangos and citrus in the central region of Togo and control methods by fungicides English Abstract Objectives: Begun in 2014, an epidemic of mango and citrus dieback broke out in the central region of Togo. This study was undertaken to determine the causal pathogen and to identify a pesticide to control the disease. Methodology and Results: A survey was conducted to collect tissue samples from diseased plants. Potential pathogenic fungi were isolated from these tissues by cultivating them on PDA and PDA amended with mango extracts. Fusarium solani , Phoma glomerata (27.78 and 16.67% of the tissues studied) and Lasiodiplodia theobromae were isolated but the later was more frequently encountered and present on 83.33% of studied tissues. Five fungicides available on the local market were tested. The symptoms of the disease and the frequency in the diseased tissues pointed to L. theobromae as the main causal agent. All fungicides blocked the germination of L. theobromae spores. Banko Plus, a binary fungicide containing carbadazim, best inhibited the growth of L. theobromae . Conclusions and application of findings: The control of the epidemic can be summarized to the control of L. theobromae . Firstly, the incorporation of Mancozeb into the culture medium before its insemination was the most effective followed in order by Callomil, Jumper, Callicuivre and Banko Plus. This treatment blocks spores germination and could be used to prevent the disease. Secondly, in the case of spraying of fungicide suspensions on growing colonies on PDA, Banko Plus gave the best result. The combination of Banko Plus, used as systemic fungicide, and Mancozeb, as contact fungicide, should be effective in controlling the dieback of mango and citrus in Togo. Keyword: Dieback, Lasiodiplodia theobromae , systemic fungicide, Mango tree, Citrus

Dépérissement des manguiers et citrus dans la région centrale du Togo et méthodes de lutte par des fongicides