Two forms of Sigatoka leaf spots affect bananas yellow Sigatoka, caused by the fungus Mycosphaerella musicola Zimm. Deighton anamorph Pseudocercospora musae, and black Sigatoka, caused by M. fijiensis Morelet Deighton anamorph Paracercospora fijiensis Stover, 1980. Both leaf spot diseases are of economic importance, but black Sigatoka develops more rapidly, causes more severe defoliation, and is more difficult to control than yellow Sigatoka Stover & Dickson, 1976. In addition to being more virulent on its traditional banana hosts, black Sigatoka also attacks plantains, which are not normally susceptible to yellow Sigatoka Stover, 1980.

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