Every lawn is vulnerable to plant diseases. Turfgrass diseases can be caused by the natural fungi that live in the soil and on the plants themselves. With many fungi living in the soil, some are beneficial to plants while others will attack and even kill them.
Having a professional evaluate your lawn to determine whether there are turfgrass diseases causing harm to your plants because many of the symptoms of disease can mimic other problems. Dead rings of grass and round, brown spots can be caused by disease. Other symptoms are rotten roots and red or white patches on the blades of grass themselves.
Preventing disease in your lawn is the best way to keep your lawn healthy. When lawns are overwatered, they can cause harmful fungi to spread. In between each watering, the surface of your grass should dry out to prevent too much moisture from accumulating on the plants. When you water your lawn is also important. When you water in the evening, more of the water stays in the soil, and the deeper penetration of the water leads to stronger roots that can better withstand disease. Watering in the morning or the hottest part of the day creates shallow watering due to the evaporation of the water. This can leave your plants vulnerable to many problems, including disease.
Keep your lawn from being stressed by not cutting it too short and having sharp blades on your mower. When the grass is too short, the stress this causes to the plant makes it vulnerable to disease. If you use a dull mower blade on your lawn, the grass blades will be shredded instead of neatly cut. This shredding doesn't allow the blades of grass to heal as well, and it makes it easy for disease to infect it.