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- Large, dark cigar-shaped spores
- Generally straight and uniformly dark
(Drechslera spp.)
- Generally curved, sometimes with "keystone" cell; end cells lighter than center cells
(Curvularia spp.)
- Slender, crecent-shaped spores
- Two or more cells; dark acervuli with black spines NOT PRESENT on infected leaves and stem-bases
(Microdochium nivale )
- Generally one cell, crescent shape with hole in center; dark acervuli with black spines PRESENT on infected leaves or stem bases
(Colletotrichum graminicola )
*during hot weather
*during cool weather
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