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Pythium Root Dysfunction Outbreak across North Carolina

April 23, 2010
by Lee Butler

Lane Tredway and Lee Butler
Department of Plant Pathology
North Carolina State University

Recent periods of warm, dry, and windy weather have triggered the development of Pythium root dysfunction (PRD) symptoms on creeping bentgrass across the Piedmont and Coastal Plains of North Carolina. PRD is a common disease of putting green surfaces planted with creeping bentgrass in a high sand content root zone mixture, particularly those established within the last 10 years.

The spring symptoms of Pythium root dysfunction appear in patches or rings, ranging in size from 6 inches to several feet in diameter. The affected turf often show signs of wilt or chlorosis, but in some cases a yellow, orange, or reddish brown foliar dieback is observed.

Fungicides are available for PRD control, and should be applied in the fall and spring when average daily soil temperatures are between 50° and 75° F.  Average daily soil temperatures in sand based greens will be close to average daily air temperatures. We recommend that you initiate your program when temperatures reach this range over five or more consecutive days.

For more information about Pythium root dysfunction and preventative fungicide programs, please visit the following link:

Pythium Root Dysfunction
Pythium Root Dysfunction

Pythium Root Dysfunction
Pythium Root Dysfunction