Centipede grass is a hard-wearing coarse perennial grass grown primarily as shorn lawn turf in warm climates where frost and freezing temperatures are not an issue. Commonly known as a low maintenance grass due to a slow growth habit and adaptability to varied soil conditions, centipede grass is sensitive to a few disease concerns that may require cultural changes or chemical intervention to ameliorate.
Alkaline soil and high amounts of phosphorous in applied chemical lawn fertilizers can cause problems for centipede grass. The already slightly greenish-yellow blades of centipede grass will fade to an unsightly pale yellow when suffering from a lack of iron. Foliar applications of iron sulfate and low phosphorous fertilizers will help to correct the problem.
Fairy Rings is a mushroom fungus that creates large, round, dead patches or discolored but still green patches on the lawn surface. The rings range from just 3 inches to upwards of 20 inches in diameter and grow over time. Treatment is limited to rototilling the soil and grass, though they may reappear when weather conditions are fungus friendly.
Dollar Spot is a condition that presents in the summer, making round brown spots on the grass roughly two to four inches in diameter. While it is not life threatening it is unsightly. It is caused by a fungus known as Rhizoctonia solani AG2-2LP and can progress through the year, making first yellow and then brown circular dead spots on the lawn. Topical fungicides can help to control and prevent it.