Sycamore Tarspot

Rhytisma acerinum

Sycamore Tarspot is the result of the fungus Rhytisma acerinum affecting the leaves of Sycamore and Maple trees. In autumn, black spots with golden edges appear on the leaves. The fungus survives the winter on fallen leaves and generates spores in the spring. These spores are sticky, enabling them to adhere to new leaves.