WSU Extension


Lawn and Turf
2,4-D damage 
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) 
Necrotic ringspot 
Powdery mildew 
Pythium crown and root rot 
Red thread 
Septoria leaf spot (Tip blight) 
Slime molds 
Take-all patch 
Typhula blight (Gray snow mold) 
Yellow patch 
Chinch bugs 
European Chafer 
European crane fly 
Japanese beetle 
Japanese beetle 
Sod webworm 

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Caption: Brown blight
Photo by: R.S. Byther
Lawn and Turf : Brown blight
(revision date: 6/22/2015)

Brown blight is a fungal disease affecting the leaves of perennial ryegrass and some fine fescues. Infection commonly occurs during cool, wet periods. The disease is typically worse during the first fall after planting and on grass with insufficient nitrogen. Affected leaves develop small, oval, chocolate brown spots or larger brown streaks up to 3/8" long. The leaves may be girdled and turn yellow, dying back from the tip. Overall, the affected areas of grass look brown and thin and may appear drought-stressed. The disease is spread by infected grass clippings, contaminated equipment, wind, or splashing rain. The fungus can survive in infected plant debris and infected plants. This disease rarely does enough damage to kill grass.
Management Options

Non-Chemical Management
  • Provide good culture by fertilizing, mowing, and irrigating properly. Vigorous, healthy grass is more disease-resistant.
  • Water in the morning so grass can dry quickly.
  • Provide adequate nitrogen, particularly in the fall, as part of a balanced fertilizer regime. Avoid overfertilization.
  • Provide good aeration and drainage. Remove thatch and aerify as needed.
  • Plant seed mixtures containing disease-resistant hard fescues (if appropriate for your area).
  • For more information on lawns, including fertilizer and seeding recommendations, see EB0482E, Home Lawns.
Select non-chemical management options as your first choice!

Chemical Management

Chemical applications are not recommended for home lawns because this disease rarely kills grass.


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Caption: Brown blight
Photo by: R.S. Byther