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Summer Patch Outbreak Occurring across Central and Eastern NC on Bentgrass

August 21, 2008
by Lee Butler and Matt Martin

Lee Butler1, Lane Tredway1, and Matt Martin2
Department of Plant Pathology1
Department of Crop Science2
North Carolina State University

The spring of 2008 has been vastly different from that of 2007 in that most of the state experienced a wetter than normal season. This increase in moisture during prime soil temperatures for infection coupled with hotter and drier weather now has lead to summer patch symptom expression across much of central and eastern North Carolina on creeping bentgrass greens.

The symptoms of summer patch are typically circular, crescent moon, or horseshoe in shape. Patch sizes are usually in the six-inch to three-foot range. Patches typically start out chlorotic, eventually turning reddish-brown to dark brown and sometimes having a bronze colored margin.

Fungicides are available for summer patch control, however preventative programs in the spring are much better than curative ones now. Don’t despair, as for curative applications can suppress symptoms and improve turf quality. Just remember that when applying fungicides for summer patch you will need to water the product in to the depth of your root system, which can vary greatly from course to course.

For more information about summer patch and preventative fungicide programs, please visit the following link:

Summer Patch

Summer Patch

Summer Patch