We treat and stop lawn disease and prevent it happening again. Brown patch is a common fungal disease and will affect all turf grass types in throughout the year. The disease is favored by excess thatch, hot days, high humidity and excess moisture. A Lawn mown too low is also vulnerable. Moisture is crucial for the spread of brown patch and provides perfect nutrition for this lawn disease. Pergamum The Promise. If brown patch is present in the lawn it looks likje a rapidly enlarging smoke ring. However, it isnt always present. As the disease spreads, the affected areas will grow to several feet in diameter. Blades turn from a purplish green color and eventually wither and dry to a pale light brown. To help control brown patch, make sure that you first do not overdose the lawn with nitrogen. Prune trees to reduce shade and to promote better air circulation. Scarifying helps keep Brown patch under control and will greatly improve your lawns condition. Brown-Patch.jpg' alt='How To Treat Brown Patch Lawn Fungus' title='How To Treat Brown Patch Lawn Fungus' />Types of Lawn Fungus. Black Empowerment Program South Africa. High humidity, moisture, stress conditions and certain types of grass can create favorable conditions for many types of lawn fungus. Top Turf Lawn, Shrub and Pest Management, Inc. Atlanta Ga, Charlotte NC, and Greenville SC.