The Purdue Plant and Pest Diagnostic Laboratory

What's Hot on July 1, 2010
at the P&PDL!

Brown patch

Richard Latin, Turf Pathologist, Department of Botany & Plant Pathology, Purdue University

Brown patch is a fungal disease of turf that occurs during hot humid weather. Moderate to severe outbreaks on high-maintenance creeping bentgrass and annual bluegrass can result in thin, poor quality turf that may be predisposed to algae and moss infestation.  Brief episodes of brown patch activity can temporarily spoil the appearance of putting greens, tees and fairways. Taller mown turfgrasses for athletic fields and professional landscapes, especially tall fescue and perennial ryegrass, also may sustain damage from brown patch infection.

On creeping bentgrass and annual bluegrass putting greens and tees, brown patch development results in well-defined circular patches, ranging from 4 to 12 inches in diameter. Leaf blades within the patches turn brown after infection, while a gray-white band may be evident at the perimeter of active patches.  Images of brown patch field patterns and symptoms are described in my Turf Disease Profile on brown patch (BP 106-W) available at the Turf Pathology webpage.

 

Click on image to enlarge

Brown patch on turf plug

Yellowish/brown cast and thinning caused by Rhizoctonia
brown patch

Brown patch close up

Close-up of Brown Patch symptoms

Brown patch - individual leaf

Individual leaf lesions caused by Rhizoctonia

Purdue Plant & Pest Diagnostic Lab Purdue Cooperative Extension Service