It starts with small yellow spots on growing leaves, and by late summer these yellow spots expand into large black blotches that look like tar has been dropped on the leaves. × We have several maples where the edges of the leaves are turning black. The fungus responsible for the tar spots on the leaves of the tree is the most harmless maple tree fungus. What exactly is maple decline? It impacts many trees, but doesn’t usually present any critical danger to them.. Black spot disease is a fungus that mostly attacks fruit trees like the cherry tree, walnut, grapevine, raspberry, blackcurrant, oak or red currant, certain shrubs like hydrangea and also vegetables such as cucumber, bean, pea, or tomato. Leaves can have one to several spots of varying sizes at a time, which may lead to premature leaf drop. Miller's Ferriplus. These leaves are from a Blaze Maple, planted about 5 years ago. A: Art Morris, Master Arborist for Bartlett Tree Experts says he sees this quite a bit. Also, look for leaves that are too light in color or look burnt. Small Leaves. It belongs to the genus Rhytisma. Maple tar spot is a very visible problem for maple trees. Thank you. Brown leaf edges on maples and other trees are symptoms of scorch. Leaves are curling up too. I re-applied shortly after the leaves emerged. Even if you keep your lawn free of infected leaves, the chance of a tree from “down the block” infecting your tree is always present. Edges of Maple Leaves Turning Black. The maple trunk gradually turns black as sooty mold accumulates on the honeydew that the scales produce. The tree looks awful. If you spot the above symptoms on your tree, maple decline could be plaguing your tree. Tar spots on the maple leaves develop as a small yellow spot and turn black afterwards. Is My Maple Tree Dying? There are fungicides labelled to control Tar Spot on maple trees, but thorough coverage of all leaf surfaces is critical. This occurs when the tree loses water from its leaves faster than it can absorb it from the soil. Their diameter can be about an inch or more; and they can be found on the seeds (samaras) too. Maple Tree Branches Dying. The youngest leaves are usually the most affected by this disease; as the powdery mildew spreads, the leaves will curl up and turn brown as the fungus leaches away water and nutrients. This is because a fungal pathogen in … Dark staining of maple tree trunks is most commonly an indication that the trees are infested with gloomy scale. The process is slow (symptoms may not improve for a year or two following treatment), but the effects can last for several years. Every summer we get a few questions about blemished or discolored leaves on Japanese Maples, which are most often symptoms of leaf scorch, a noninfectious disease or disorder that occurs most often after prolonged periods of dry and windy hot weather or bright sunshine, when the roots of a tree, especially young or recently planted trees which have yet to develop a substantial root system, … Black spot disease is diagnosed when black or brown spots appear on leaves.. Symptoms: Begins as yellow spots on leaves before turning into black, tar-like spots Causes: The Rhytisma fungus Treatment: None. Any ideas? If there are fewer leaves than normal, that’s another telltale sign. Early Fall Color. Treatment for Maple Leave Tar Spot. While not life-threatening, tar spot is a fungal infection that affects maple tree leaves. I dumped a lot of Miller's Ferriplus (about 6% chelated iron) all around each tree under the drip line in the spring before the leaves emerged. The leaves are covered with black patches on the interior of the leaf. Can you tell me what is causing this and if there is anything that can be done to help this tree?