How to Prevent Black Spots on Maple Leaves Once a tree is too large to spray, there’s barely anything you can do to treat the condition. However, because Tar Spot doesn’t affect the inside of the tree and is not life-threatening. You can then continue to apply the solution weekly for 3 weeks. If your Maple trees are still young and are developing Tar Spots, or if you know that you are growing maples in a Tar-Spot-prone area, it may be worth applying a fungicide when the buds begin to break open. It is difficult to treat Tar Spot in a mature Maple and your time is better spent working on preventing the condition from returning the following year. The fungus thrives in a moist environment and is more likely to take hold if the area you live in a rainy area, or if you have had a particularly rainy summer and autumn. In some cases, the leaves of an affected tree will also turn yellow prematurely.įungal rust spots on leaves develop when fungal spores are carried from one infected tree to another through air currents or a shared water source. Trees affected by Tar Spot will often drop their leaves prematurely, and the leaves will be marked with tar-like splotches of black, often surrounded by a thin yellow ring. The black spots may also become slightly raised and can also show up on maple seeds. They then transform into yellow dots with a diameter of approximately 1/3 cm in mid to late summer before growing to become larger tar-like black circles of up to 2 cm in diameter in the autumn. The first signs of infection generally begin to show as minuscule light green dots on leaves in early to mid-summer. Tar Spots can affect Norway Maple, Silver Maple, Box Elder Maple, Oregon Maple, Red Maple, Sugar Maple, Japanese Maple, Freeman’s Maple, and Sycamore trees. It is fairly easy to identify Tar Spot on Maple trees, and most people will be familiar with the black splotches that result from the fungal infection.
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