Cashew (Anacardium occidentale L.), is an economically export oriented crop that could plays an important role in the Cameroonian economy. Owing to its importance, a study was carried out to evaluate the potential antifungal activities of three plants extracts against three major fungal pathogens associated to its seeds. To achieve this objective, cashew seeds samples were collected from Cameroon and Chad, and fungal pathogens isolated on Potato Dextrose Agar (PDA) culture medium. In vitro antifungal activities of Callistemon viminalis, Cupressus lusitanica and Lantana camara were assessed on three major fungi; Cercospora sp., Colletotrichum gloeosporioides and Pestalotia heterocornis. Results showed that cashew seeds harbour a diversity of fungal species; the most frequent are Cercospora sp. (26%), followed by Aspergillus niger (17.78%) and P. heterocornis (15.6%). Aqueous extracts at 28 mg/ml and ethanolic extracts at 16 mg/ml of C. lusitanica and L. camara, inhibited at 100%, the radial growth and sporulation of all tested fungi. This preliminary work has opened up a possibility of the use of these extracts in the treatment of seed-borne fungi of cashew nuts. However further studies are still on-going under in vivo field conditions to practically evaluate on their potential in cashew seeds disease management.

Sigatoka Disease (SD) represents the major pre-harvest fungal disease of banana and also appear as the major constraint of banana production. This diseaseis caused by two major pathogenic fungi, Pseudocercospora fijiensis and P. musicola. It provokes necrotic lesions on leaves and serious infestations leads to a substantial reduction in the green leaf area of infected plants and thus the photosynthetic area of the plant and consequently leads to yield loss. In the present work, three plantations were surveyed and experiments conducted in Southwest Cameroon to assess the prevalence and severity of sigatoaka disease in the banana plantations. Our results revealed a 100 % prevalence of Sigatoka in the field with an incidence of 59 %. In a severe manner, the severity in all the plantations was seen to have a constant increase with the highest severity at 23.83 % observed in plantation 1. In a nutshell, the incidence and severity of the disease was seen to increase with respect to time and season.

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Despite the nutritional, economic and medicinal values of banana plant, independent of the region and production system is confronted with some diseases such as the fungi disease. These fungal diseases are responsible for the low yields. The objective of this study was to improve the sanitary state of banana plant. To achieve this objective, fungi associated with banana leaves were isolated on Potato Dextrose Agar (PDA) culture medium and their identification was done on the basis of morphological and microscopic characteris- Keywords