Large, dark cigar-shaped spores

• Generally straight and uniformly dark (View info on 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 (View info on 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 – View info on Anthracnose
  • During cool weather – View info on Basal Rot Anthracnose