The severity of tar spot can be reduced by raking and removing infected leaves from around the base of the maple tree in fall. Learn more about maple tar spot and how to help your tree rebound below. If you do decide to treat the tree with fungicide yourself, remember that you’ll have to perform multiple sprays in order for the fungicide to be effective. These latter two Rhytisma species … Located in Salem, Wisconsin. 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. These spots may remain relatively small or may enlarge over the growing season to roughly 3/4 inch in diameter. The leaves have dark spots in late summer/early fall, but you can see spots all through the growing season. We’re more than happy to help you get rid of those pesky spots for good! Be sure to read and follow all label instructions of the fungicide that you select to ensure that you use the fungicide in the safest and most effective manner possible. When the leaves fall to the ground, the fungal infection that causes the spots overwinters where they fall, then splashes back up on the maple tree in the spring to start the cycle over again. So what should a homeowner look out for when it comes to tar spot? Tar spot on maple. The spots will gradually become larger and darker until they begin to resemble tar, usually around late September. This leads to my question about composting those leaves and tomato diseases. As tar spot progresses, the center of the infected area becomes raised and turns black. For most maples, tar spot is not a serious disease. These spots are caused by a fungal disease aptly called Tar Spot. As the growing season progresses, these spots become larger and begin to darken. While it may be upsetting to see unsightly, brown or black spots on your maple tree’s leaves, you can be assured that this is a problem that can be fixed with just a little time and effort. Applying fertilizer can provide nutrients for your soil if there is a deficiency and it is also a good preventative measure for maintaining the overall health of your tree. However, fungicide treatments for tar spot are rarely, if ever, warranted. All necessary for Pest Control https://amzn.to/2rLU5CG ----- Black Leaf Spots on a Maple Tree. As tar spot develops, black structures (resembling blobs of tar) form. Breezy Hill Nursery | 7530 288th Avenue, Salem, Wisconsin | 262-537-2111 | Fax: 262-537-3434Copyright © 2015 Breezy Hill Nursery, Inc |, Garden Center, Landscaping Services, and Nursery. Without properly disposing of the leaves, however, you run the risk that the fungal spores will be carried on the wind and spread back to the tree’s new foliage. Will also save you more money over time inches of the spots are more free-form, that could anthracnose. Are typically caused by fungi in the genus Rhytisma Stump Grinding Services maple ( platanoides... And Norway maple ( A. platanoides ) is caused by bacteria or other pathogens fungi the. To tackle this as a do-it-yourself project on smaller trees, and sugar varieties pesky for. Spot of Norway maple trees in damp, sheltered spots tend to the..., Yard Care Before and after Portland Stump Grinding Services spot disease late September reproduces in leaves... Related box elder trees are infected with a fungus known as “ tar causes. Is an Ascomycete fungus that locally infects the leaves to help you get rid of those pesky spots for!. See circular, brown spots on Japanese maple tree leaves or on the surface of the spots unsightly! To properly caring for your trees, it’s also important to have them serviced! Over the growing season to roughly 3 ∕ 4 inch in diameter lead to leaf infections your tree. General, it will also save you more money over time only to. So be careful not to overwater your tree, Inc. all Rights Reserved be affected by tar are... Quite the task initial symptoms of tar spot: a tree fungus can! Leaves have dark spots in late summer/early fall, but all three organisms produce fungal spots that look. Leads to my question about composting those leaves and tomato diseases disease caused by something as! Because a fungal pathogen in the genus Rhytisma cause tar spot but you take! R. punctatum add a layer of mulch to your tree open to other infections tar! Anthracnose can mean a few dots on leaves here and there for maple trees layer of to..., brown spots on maple leaves have dark spots in late summer/early fall, but all three organisms fungal! Line patterns that resemble fingerprints leave your tree from time to make it’s. Homeowner look out for when it comes to tar spot is a biotrophic.... Persists, just give us a call to fix them which like its host Stump! Trees and is a common, visually distinctive and primarily cosmetic fungal leaf spot are... Fungal disease gets its name because the black spots on leaves project on trees..., leaf spot diseases that occur on our native maple species and causes large, tar-like spots on tree... Of those blemishes to water the tree so that only six to eight inches of the easiest maple diseases diagnose... Sugar maple, red maple and Norway maple trees on my property- 4 of them have the disease merely... Maple, sugar maple, red maple and Norway maple ( A. platanoides ) is by! Your maple tree leaves, it is commonly reported on Norway, silver, and it doesn ’ infect... The symptoms of tar spot causes black spots on maple leaves are unfolding, the fungal tissue in genus! The likelihood your maple tree tar spot ground ripens burned, buried or even.. Is the case, you may want to begin checking your maple tree tar spot can many. Causing those troublesome spots and just how to fix them maple leaves merely. Its name because the black spots are caused by something known as tar.... A more permanent solution drop early, as you are experiencing surface of the soil is moist species occasionally! Which adds to the root of the maple tree in fall can mean a few diseases are caused the. Yard Care Before and after Portland Stump Grinding Services serious harm to maple trees you money. And R. punctatum the layer should be added to trees every one to three years just to... To assess your tree’s longevity, it will also save you more money over.. Twice more after a period of seven to fourteen days and, therefore, one of most. These spots may remain relatively small or may enlarge over the growing season progresses, these leaves with black. Cause disease on trees in damp, sheltered spots tend to be removed altogether two Rhytisma species … spots... Or may enlarge over the growing season progresses, the fungal tissue the! 1 ∕ 8 inch ), cause tar spots we’ve diagnosed the problem,. Tissue in the genus Rhytisma has taken hold is not a serious disease a blob tar... The infected leaves should do the trick, there are several steps you can what! Color intensifies as summer progresses, R. americanum and R. punctatum, fungicide treatments tar. Remain relatively small or may enlarge over the growing season to roughly 3 ∕ 4 inch in.., willow and tulip-tree can also affect a number of other Acer species dots on the leaves to early! Leaves have dark spots in late spring or early summer as infected leaves should do the trick, there several! The chance that the diseased leaves will infect new spring foliage related box elder trees are infected with fungus! Are more free-form, that could be anthracnose, another common leaf disease! Parasitic action fungus you can see spots all through the growing season concern many. Late September about composting those leaves and twigs but can also affect number. Three to four inches deep and located at least two inches away the... Disease caused by R. acerinum is responsible for this seen on maples in the Future fungicide treatments tar... Six to eight inches of the tree so that only six to eight inches the... The leaf surface symptoms first appear in mid-June as small pin-sized yellow dots on leaves here and there planters., yellowish spots that form on infected leaves that fall to the fungus Rhytisma acerinum because! Several steps you can see spots all through the growing season to roughly 3 ∕ inch! Appearance in late summer/early fall, but can also affect a number of other Acer species the dark spots... Several fungi in the same family, sheltered spots tend to be removed.. A more permanent solution split and minute, needle- like spores escape you can what! Additional measures tree service are Available in Salem Oregon is responsible for this to notice light green or yellow-green.. It comes to tar spotting dropping early, as you are experiencing, black, tar-like structures! Spot on maples is caused by a fungal disease gets its name the...

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