Brown Patch

From Turf Wiki

• Pathogen: Rhizoctonia solani Kuhn

• Common Names: Brown Patch, Rhizoctonia Blight,

• Climatic Zone: Temperate, Subtropical, and Tropical

• Geographic Distribution: North America, Europe, East Asia, Australia, Africa, South America

• Favorable Conditions:Most active under hot, humid weather conditions. Day temperatures in the 90's F (33 C) and night temperatures above 70 F (21 C) combined with high humidity are ideal.

• Hosts:Creeping Bentgrass, colonial bentgrass, velvet bentgrass, Perennial Ryegrass, Annual Bluegrass (Poa annua), bermudagrass (Cynodon dactylon), Tall Fescue, Kentucky Bluegrass, St. Augustinegrass, zoysiagrass, fine fescues

• Symptoms:On short cut creeping bentgrass and annual bluegrass, appear as brownish circles or patches with a dark colored "smoke ring" along the outside