Disease Hotline Issue 21

Drought and heat effects on perennials – Hosta

Photo by Gordon Johnson, University of Delaware
Brown patch produces characteristic symptoms on tall fescue leaves: irregularly shaped lesions that are tan in color with a dark brown border.

From a distance, brown patch appears in brown, tan, or yellow patches ranging from 6 inches to several feet in diameter. The infected leaves typically remain upright, rather than collapsing to the ground.
Brown Patch Pictures From North Carolina State University Plant Pathology Extension

Turfgrass Disease Information Note 15 (TURF-015)

Powdery Mildew on Lilac
Photo from Iowa State University Plant Disease Clinic