Gray Leaf Spot disease is caused by a fungus and requires special fungicides for treatment. You’re most likely to notice Gray Leaf Spot disease during the wettest months of the year. The rain and high humidity create the perfect environment for this fungus to flourish.
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Gray Leaf Spot is a perfect name for this disease because it describes exactly what you should look for. If affected, you’ll notice your blades of grass will have a discoloration of a gray circle, often surrounded by a dark green ring. Usually the spot is circular or oval. As the fungus spreads through the grass, the entire blade changes color as the spots merge together.
The best way to avoid Gray Leaf Spot disease is to water your lawn at the appropriate time of day. Set your sprinkler system for the early morning, so the grass will dry quickly. Evening waterings often leave the grass wet for too long and invite the fungus to take root.