Dead Spot

From Turf Wiki

• 'Pathogen: Ophiosphaerella agrostis Dernoeden, M. P. S. Camara, N. R. O'Neill, van Berkum, & M. E. Palm

• Common Names: Bentgrass Dead Spot, Bermuda Grass Dead Spot

• Climatic Zone: Temperate, Subtropical, and Tropical

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

• Favorable Conditions: For cool season grasses the optimum temperature range is at or above 68 degress F (20 degrees C) during dry, hot conditions. For warm season grass, usually during spring green-up. For both types of grass hot, dry, full-sun conditions and sandy soils.

• 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: Small red or brown patches 1/2"- 3" diameter, grass at the center of the spot may be tan with the outside a reddish-brown color, leaving a depression. Roots and the bases of stems may also be discolored