White substance on grass blades

Asked November 24, 2015, 8:55 AM EST

Hi, Our grass blades in the backyard are covered in a white powdery substance. We had a few patches in the spring and now with fall it is much more prevalent. Could this be some sort of mold or fungus. Our dog has also been having GI issues and I'm wondering if this could be causing it. How can we get rid of it? Thanks, Stephanie Stevens

Montgomery County Maryland

2 Responses

We cannot see any powdery substance in the photo, but that is not unusual because many turf molds disappear quickly.

Our plant pathologist is out of the office until Monday, November 30 and can look at your photo then.

Meanwhile, look at the photos of lawn diseases on our website. You may be able to easily pinpoint what you saw: http://extension.umd.edu/hgic/diseases-lawns


Our plant pathologist viewed your photo. A mixture of grasses was identified - fescue and bluegrass. The bluegrass looks like it was subject to a leaf spot as well as powdery mildew. Bluegrass has a higher incidence of disease, drought, and insect damage than fescue. We do not recommend a control. Fungicides are expensive and not worth the effort. We recommend that you encourage the growth of tall fescue. If your turf is thin or you need to repair bare spots, seed with tall fescue. Best time is the fall. Second best time is the spring. See our publication on lawn renovation and overseeding http://extension.umd.edu/sites/default/files/_images/programs/hgic/Publications/HG102%20Lawn%20Estab...