Rhizoctonia Brown Patch

 

Rhizoctonia Brown Patch Information

Scientific Name: Rhizoctonia solani

Turfgrass host: Annual Bluegrass, Kentucky Bluegrass, creeping bentgrass, perennial ryegrass, tall fescue, fine fescue

Time of Year: June thru September

How To Identify Rhizoctonia Brown Patch

Rhizoctonia brown patch is a fungus that attacks all turf-grass species in Michigan when day temperatures reach the 80s and humidity is high. Symptoms are often disguised by actively growing turf. Infected turf almost immediately shows damage during hot, moist , overcast weather. Brown patch often has a slimy appearance. On grasses that are cut high,  the light brown patches are up to 2 feet wide. On closely cut bentgrass, the patches are up to 2 to 3 feet wide. When moist, a grayish black smoke ring of wilted and blighted grass may be evident on the patch edge.

 How to get rid of Rhizoctonia Brown Patch

Avoid high nitrogen levels as nitrogen will help Rhizoctonia Brown Patch will spread with the increased nitrogen. Remove dew eary in the morning  and increase air circulation. Fungicides like chlorothalonil, mancozeb, flutolanil, trifloxystrobin, pyraclostrobin, and azoxystrobin can help manage the disease.