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Maples are prone to many diseases, such as anthracnose, verticillium wilt, and powdery mildew, but I am still confused, so I call Brian Crooks, a forester with the Western Pennsylvania Conservancy.

A second, more serious possibility would be a soil disease called verticillium wilt, a fungus that causes defoliation.

Katharina Hanika, “Impairing disease susceptibility genes to obtain resistance to Verticillium wilt in tomato”

Trees in Grace Lawn and Prairie Street cemeteries are not showing symptoms of verticillium wilt yet, but the forestry division will keep an eye on those sites and perform some trimming and removal as necessary.

Coy said there is one major lesson to take from the loss of the tree canopy due to the emerald ash borer and verticillium wilt: Diversification is important.