For this reason, powdery mildew is likely to damage susceptible varieties growing in shady areas. In severe cases the lawn turns yellow and may thin out. It is also subject to winter injury. Consider your lawn situation before deciding what control action to take with powdery mildew. If you are just starting a lawn and you know the area will be shady, avoid varieties that are vulnerable to the disease.
Red fescue is the most shade tolerant grass available.
The Nugget, Glade and other Kentucky bluegrass varieties reportedly have some shade tolerance. These grasses can also be used to overseed the shady areas of lawns, but you should get advice on good ways to establish an overseeding. It is not easy to accomplish. For those sunny lawns that become only occasionally infected, especially late in the fall, there is really no need for treatment. The powdery mildew will not hurt the lawn.