Black spots may develop for a variety of reasons, so it's important to recognize all of the symptoms of aspen leaf spot. Symptoms occur between July and frost. Leaves affected with the disease will be scattered randomly throughout the tree and spots will appear randomly on the leaves. The spots are dark brown to black circles containing more rings, looking almost like a bulls-eye. Sometimes the edges of the spots may appear irregular or feathery. For an accurate diagnosis, contact your local Extension Service office.
Please see PlantTalk script Aspen leaf spot for more information.
