Anthracnose of rambutan

Colletotrichum gloeosporioides produces a wide variety of symptoms depending on host species and tissue infected. In the fruits, black or brown lesions (e.g., on pods, scab, and pitting) are common. Infection on the inflorescence produces blight, necrosis, and lesions with flecks and streaks. Infected leaves produce abnormal colors and patterns with dark, necrotic, angular, or irregular areas. Dieback and discoloration with gummosis and resinosis occurs on infected stems. Sometimes, cankers are also seen in the infected stem. Fungal sporulation forms acervuli, a pinkish pinhead-sized structure, when humidity is high. The acervuli form in a concentric pattern around the necrotic tissue. The fruiting bodies can be seen as black flecks in the infected tissue.

In some cucurbit host, more pale lesions with less necrosis are seen. Generally, necrosis spreads and later turns into blight in yam and tea. In stylosanthes and cassava, lesions are elliptical in shape and appear dark and sunken.