Anthracnose disease is caused by a fungus. Many farmers lose money when their avocado fruits get anthracnose disease, and the fruits cannot be sold. This disease is common among many other fruits including mangoes and pawpaw.
Round, black spots form on the fruits and leaves. The spots have a sunken, rotting grey centre, where the fungus is growing. Fruit fly damage may look similar, but spots caused by fruit flies do not have the grey area.