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Any irrigation should occur in the morning so the grass blades can dry off quickly, as the grass blades must remain continuously wet for 10 hours for infection to occur.. Selectively pruning overhanging and adjacent tree and shrub branches increases sunlight reaching the grass and improves air circulation.. When weather is warm and wet, removing and disposing of grass clippings and cleaning the mower after cutting areas affected by brown patch can limit diseases spread.. Even if fungicides are applied, they will only alleviate brown patch temporarily if cultural care is not appropriate.. Irrigation and MoistureExcessive moisture around the grass greatly contributes to problems with brown patch and other fungal diseases.. Additional Care ConsiderationsExcessive thatch -- the layer of living and dead grass stems, blades and other parts atop the soil surface -- harbors pathogens and impedes water and air flow.. Related Articles1 What Causes the Light Green and Yellow Color in Lawns?2 Grass Disease & White Blades3 Is Bleach Good for Fungus in Zoysia Grass?4 Problems With Zoysia GrassBelow are the most common causes of brown spots in the lawn and how to treat them so you can get your lush green lawn back.. Brown spots due to fungal problems usually show up as irregular patches If the disease has been active for a while, the inside of the patch may recover, leaving a ring of dead grass around it.. Mowing the lawn at the height recommended for the grass species and never removing more than one-third of the grass blade height with a single mowing session slows thatch accumulation.. Brown patch, a fungal disease of turf caused by the pathogen Rhizoctonia solani, is sometimes also called Rhizoctonia blight.. No more than three or four applications each year are needed Where brown patch is a chronic problem even when cultural care is appropriate, a soil test may be warranted, as soil pH that is too low can encourage brown patch.. Compacted soils can create drainage problems and regular core aeration can alleviate this.. A deep weekly irrigation that supplies the lawn with 1 inch of water and moistens the top 4 to 6 inches of soil is usually sufficient.. This disease generally affects cool-season grasses during hot weather, causing patches that first appear purplish before turning brown and finally tan, as grass blades die.. Dethatching whenever a thatch layer greater than one-half inch develops benefits the lawn.. Inadequate phosphorous or potassium can also contribute to brown patch Generally, a complete slow-release fertilizer applied at a rate no greater than 1 pound of nitrogen per 1000 square feet of lawn, with each application spaced 6 to 8 weeks apart when the grass is actively growing is sufficient.. FertilizationExcessive or fast-release nitrogen fertilizer applications, especially in late spring or summer for cool-season grasses, encourages a flush of tender new growth particularly susceptible to brown patch.. The most effective way to prevent or address brown patch is to observe excellent lawn care practices. d70b09c2d4
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