Monosporascus is a genus of fungi in the family Diatrypaceae. It has nine species. The type species, Monosporascus cannonballus, is a widespread plant pathogen that causes vine decline of melon and watermelon crops.

Species Monosporascus brasiliensis Monosporascus caatingaensis Monosporascus cannonballus Monosporascus eutypoides Monosporascus ibericus Monosporascus monosporus Monosporascus mossoroensis Monosporascus nordestinus Monosporascus semiaridus

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