symptoms of rough leaf spot can appear on leaf blades, leaf sheaths, peduncles, stalks, and glumes of susceptible species. on sorghum, symptoms are usually noted on leaf blades beginning as small red lesions. lesions expand over time, becoming broadly-elliptical up to one inch in length. spots usually develop a tan interior bordered by a dark red to purple color, but can remain a uniform dark color. the presence of black pycnidia exposed on the surface of the lesions give the leaf a rough, sandpapery feeling, hence the name “rough leaf spot.” rough leaf spot can eventually lead to leaf senescence.