Install an internal drainage system if you have severe drainage problems. An adequate aeration program will relieve compaction and improve drainage. Aeration should annually disrupt between 15–20% of the total surface area. Avoid using quick-release fertilizers; try using slow-release ammonium sources. If the soil pH is above 6, then use ammonium sulfate, which will acidify the soil. Turfgrass has been shown to be most resistant to summer patch when soil pH is between 5.5 and 6. Most balanced fertility programs for Kentucky Bluegrass lawns will consist of applying two to five lbs of nitrogen/1000 sq.ft. a year. Promote root growth by watering heavy and infrequently. Since low mowing heights are conducive to shallow rooting, raising the height of cut can possibly result in less summer patch injury. Chemical control If severe enough or on high valued turf (golf greens) summer patch can be controlled with the use of fungicides. Applications are made on a preventive basis and usually applied 3–4 weeks before symptoms appear. High water amounts should be used, about 5–10 gallons per . Effective fungicides include: Benzimidazoles: Cleary 3336, Fungo 50, T Storm DMIs: Banner, Bayleton, Eagle, Rubigan, Lynx, Spectator, Trinity Strobilurins: Compass, Disarm, Heritage, Insignia References Fungi described in 1989 Fungi of North America Magnaporthales Turfgrass diseases