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Maple Tar Spot and the maple trees it infects have evolved so that their annual patterns are in synch. It’s more likely to become infected if there are many other infected trees in your neighborhoods, if you don’t take any preventive measures, or if spring weather has been particularly wet. Whether or not your particular maple will develop Maple Tar Spot can depend on its surrounding environment. Will my maple get tar spot?Īll of these maples are susceptible to Maple Tar Spot because of their common plant genus, Acer. platanoides), and many cultivars of Japanese maples ( A. In our area, you’ll also find other non-native maple species such as Sycamore Maple ( Acer pseudoplatanus), Norway Maple ( A. Ohio has a number of maple species that are native to the state, including: Which trees are affected by maple tar spot?Īs its name suggests, Maple Tar Spot is a disease of maples. It’s followed by spring growth and release of fungal spores that are carried by wind and water to its host plants, our beloved maples. Like many other fungi, Rhytisma has an annual life cycle that includes dormant overwintering.

Maple Tar Spot is caused by one or more species of the fungus Rhytisma. While it’s unattractive and can spread easily, Maple Tar Spot is not fatal to your trees. Maple Tar Spot is a common fungal disease whose name describes it well: maple leaves display dark, round spots that look like tar has been splashed on them. So when your maples develop disfiguring dark spots on their leaves, you’ll want to know what is causing it and what you can do. In addition to their flaming fall color display, maples are valuable, long-lived trees that sequester carbon and help keep our air cleaner. Here in northeast Ohio, maples are beloved shade trees that offer green summer canopies, bright fall colors, and some also give us maple syrup for our pancakes. Learn what to look for, how it spreads, and what to do about it. If the leaves on your maple trees have dark, round spots that look like they’ve been splashed with tar, it’s probably a fungal disease called maple tar spot.