Diversity of fusarium oxysporum isolates responsible for grande naine banana tree’sleaf chlorosis (cavendish subgroup) in Côte D'ivoire

In banana tree plantations, leaf yellowing was noticed by producers. With the aim of making the etiology of banana tree chlorosis so as to contribute to the improvement of banana tree yield, the distribution of the disease in plantations was observed. The phytosanitary status of infected banana tree plantations was assessed by calculating the prevalence of leaf chlorosis. The characteristic symptoms of banana treeleaf chlorosis were described. Sampling was done in order to isolate the causative agent. An identification of fungal isolates associated with symptoms of banana tree leaf chlorosis was made. The isolates responsible for leaf chlorosis were made by a pathogenicity test on vivoplantsin greenhouse. The results showed that sick banana trees were randomly distributed in plantations. A high prevalence of the disease was noticed with variations depending on the plantations surveyed. The symptoms noticed were leaf chlorosis, leaf yellowing and vascular tissue necrosis. Fungi of the different genera were isolated. Thirteen Fusariumoxysporum morphotypes were identified, of which three Fusariumoxysporum f sp. Cubense morphotypes induced the characteristic symptoms of leafchlorosis on the vivoplants used. Banana plantations could be infected by Fusariumoxysporum f. sp. cubenseisolates responsible for leaf chlorosis in Côte d’Ivoire.