Avoid close clipping at all times. If dense thatch more than one-half inch thick has formed, reduce or remove it with a power rake in the spring or early fall. These machines can be rented at most large garden supply centers. Application of sufficient, but not heavy amounts of slow-release available nitrogen can also help. Too much nitrogen can be detrimental and can leach into the ground water.
Soil tests can determine proper amounts.
Proper watering practices will also help manage melting-out disease. Your county Extension agent can recommend grass species to grow. Controlling Turfgrass Pests . Inc. Englewood Cliffs, NJ 07362. Smiley, R., P. Dernoeden, and B. Clark.