The lesions of Stagonospora leaf blotch are normally brown or tan, surrounded by a thin, yellow halo. Lesions caused by Stagonospora leaf blotch are more irregular in shape and often have a darker color than those of tan spot. The presence of small, honey-colored fungal reproductive structures is diagnostic for Stagonospora nodorum blotch; however, these reproductive structures are only visible with considerable magnification. This disease also may affect heads late in the growing season.
