Corynespora cassiicolais reported in the Republic of Seychelles, where it causes a leaf spot disease of tomatoes, cucumbers and watermelons. Isolates from tomatoes and cucumbers were cross pathogenic, but differences in symptoms indicated a degree of host specificity. The fungus developed rapidly as a saprophyte and sporulated abundantly for at least 28 days on dead tomato leaves in the field. Numbers of conidia increased with duration of wetting of the debris.C. cassiicolacolonized and sporulated on papaya leaf debris. Isolates from papaya leaf debris caused leaf lesionsontomato, cucumber and watermelon, but isolates pathogenic on papaya were not found.C. cassiicolais an aggressive facultative parasite that sporulates abundantly on plant debris. Inoculum ofC. cassiicolafrom several sources can initiate disease cycles. Consequently, sanitation as a control measure appears to be justified.