WSU Extension

Hortsense

Lawn and Turf
 
Disease
2,4-D damage 
Algae 
Anthracnose/Basal crown rot 
Brown blight 
Brown patch 
Curvularia blight (Fading out) 
Dog injury 
Dollar spot 
Fairy ring and mushrooms 
Leaf spot 
Microdochium patch (Pink snow mold) 
Moss 
Necrotic ringspot 
Powdery mildew 
Pythium crown and root rot 
Red thread 
Rusts 
Septoria leaf spot (Tip blight) 
Slime molds 
Take-all patch 
Thatch 
Typhula blight (Gray snow mold) 
Yellow patch 
Insect
Ants 
Billbugs 
Chinch bugs 
Cutworms 
European crane fly 
Leafhoppers 
Moles 
Sod webworm 



print version| pdf version| email url    
Caption: Yellow patch fungal mycelium
Photo by: R.S. Byther
  
Lawn and Turf : Yellow patch
(revision date: 6/22/2015)


Biology
Yellow patch is a fungal disease which may affect bluegrasses, annual bluegrass, and bentgrasses. Symptoms are typically seen in fall, winter, and spring. Light brown to yellow patches and rings form on affected turfgrass. Lesions on the leaves are rarely seen. The patches may recur in the same locations whenever conditions are favorable. Cool, moist conditions favor disease development. Prolonged leaf wetness, excessive thatch, poor drainage, cloudy weather, and excessive fertilization also contribute to disease development.
Management Options

Non-Chemical Management
  • Provide proper culture, including adequate, balanced fertilization and deep, infrequent watering.
  • Water in the morning so grass can dry quickly. Do not overwater.
  • Provide good drainage.
  • Avoid practices which favor disease such as excessive fall applications of nitrogen.
  • Mow regularly at the recommended height.
  • Remove thatch and aerify as necessary.
  • For more information on proper care of lawns, including mowing heights and fertilizer recommendations, see EB0482E, Home Lawns.
Select non-chemical management options as your first choice!

Chemical Management

None recommended. Fungicides effective in controlling this disease are available to home gardeners, but are typically packaged in quantities appropriate only for commercial applicators.

Images

+ Show larger images

 
Caption: Yellow patch fungal mycelium
Photo by: R.S. Byther
Caption: Rhizoctonia hyphae under microscope
Photo by: G.A. Chastagner