Turfgrass Diseases Lesions caused by: Dollar Spot fungi (Lanzia and Moellerodiscus)
and Ascochyta leaf blight - a Comparison of Symptoms

Curtis E. Swift, Ph.D.
Colorado State University Extension

Tri River Area

Individual leaf blades infected by Ascochyta usually start dying back from the tips. This bleached area extends toward the leaf base. The margin between the diseased tissue and healthy tissue develops an abrupt pinched appearance and usually develop either red borders or thin brown discolored ones. Ascochyta lesions which occur in the middle of a blade and usually do not have an hourglass shape or a border area between the white, dead tissue and the green, healthy tissue.

Dollar spot lesions bleach to a straw-colored tan bordered by a distinctive tan to purplish streak between the white and green portions of the blade. The dollar spot lesion has an hourglass appearance.

Placed on the Internet November 4, 1999
Updated May 25, 2009