They are often seedborne. They are unusual fungi in that the early stages of infection are biotrophs and then necrotrophs. Often with latent infection. Colletotrichum affects cucurbits, tomato, cereals, grasses, banana, onion and citrus. 11-66 Favored by warm humid conditions.
Control depends on disease free seed and sanitation, some resistance is available.
Fungicides applied as control and postharvest.