Lawn Grass “Dust”

Asked May 14, 2019, 12:29 PM EDT

Parts of my lawn (fescue/bluegrass) in Damascus, MD have developed a dust like covering that sticks to the blades. When raked, puffs of the substance float through the air. It seems to be spreading slowly. This is the first time it has appeared in the over 15 years I’ve lived here. What might this be and what can I do to illuminate it?

Montgomery County Maryland

2 Responses

This is powdery mildew, a common fungal disease that can infect grass. The disease can appear when the weather is cool and humid. It is not a serious disease. When the weather dries out and becomes warmer the disease will become less active. We do not recommend a fungicide treatment. First of all, once the disease appears it is too late to treat. For additional information please see the following information from our website,


Thank you.