black spots on maple tree leaves

Some reports say that the spots can get as big as two inches. Tar spot of maple Tar spot is a very conspicuous fungal leaf spot disease of sycamore and some other maples. The fungal disease causes black fruiting structures to cover the tree's bark. If there are fewer leaves than normal, that’s another telltale sign. All rights reserved. No the leaves are not sticky - thank goodness - just with the black spots on them. The black spots continue to grow in diameter and thickness to the point where it looks like someone splashed tar on the leaves. The wind carries them over a distance and some of them land on maple tree leaves. A fungus is causing black spots on maple tree leaves X Your session was unable to be renewed and will be expiring in 0 seconds. Photo credit: Steven Katovich, Bugwood.org. Phyllosticta Leaf Spot Phyllosticta is a highly localized infection that creates dark brown or purple spots on the leaves with a black spot in the middle of the larger, colored spots. There are some differences. Everyone said that they wouldn't kill the tree, but they did. Please contact Plant Information Service at (847) 835-0972 or email [email protected] for a positive diagnosis and if you feel chemical treatment options are warranted. Maple Tree Diseases The majority of maple tree diseases are purely cosmetic and don’t threaten the life of the tree. The small black dots appear on the upper portions of leaves. These types of health conditions generally affect the leaves, producing unsightly leaf spots and barren tree limbs Homeowners with maple trees are calling the Michigan State University Extension Lawn and Garden Hotline concerned about numerous spots appearing on the leaves. [1] R. acerinum is an Ascomycete fungus that locally infects the leaves of trees and is a biotrophic parasite. Based on your description, it sounds like the trees are infected with maple leaf tar spot, known scientifically as species of Rhytisma fungi. A lot of maple leaves that have fallen lately have black spots on them that make it look like the trees that shed them may be sick. For additional gardening information, call the MSU Extension Lawn and Garden Hotline at 1-888-MSUE-4MI (1-888-678-3464). Colors can range from yellow to yellow-green to orange-red to light tan, brown or black. Don’t worry, though; the fungus only attacks the leaves, leaving the rest of your maple tree alone. Depending upon the pathogen, leaf spots may occur on the upper, lower or both surfaces of the leaves. Maple Tree Tar Spot Identification: Black spots that range in size from a pin-prick to size of a half dollar (4 cm). Fortunately, tar spot does not cause serious harm to maple trees. Maple leaf blister is a disease of maple leaves that displays symptoms somewhat similar to maple anthracnose. These spots are different, but Eventually, by mid- to late summer, the spots develop black, tar-like stromata, the spore-producing structures of the fungus. Symptoms tend to be more common on trees growing in moist, sheltered locations. I hope it is just the end of the year, this happened Leaf spots may be angular or rounded, raised or sunken, and have smooth or fringed edges. This will reduce the number of overwintering “spots” (containing the fungal reproductive structures) that can infect new leaves the following spring. The tree looks awful. Leaves that are infected with this fungal disease have round, light green to yellowish-green areas approximately ½ to 1 inch in diameter that eventually blacken. The fungal disease causes black fruiting structures to cover the tree's bark. The tree probably got the name ‘autumn blaze maple’ because of … The spots enlarge and color intensifies as summer progresses. If you have the same scenario going on with your tree, don’t panic, this is a very common fungus disease called tar spot and is often seen on the Norway Maple, Silver Maple and the Freeman’s Maple. Maple tar Trees infected with maple leaf tar spot are unsightly, but the fungal disease does not affect the overall health of the plants. A number of years ago I lost a mature maple that had black spots on the leaves, although they were different. Everyone said that they wouldn't kill the tree, but they did. Like leaves falling in autumn, I’ve gotten a flurry of email about my column this week on maple leaves dotted with tar spots, a byproduct of a fungus known as Rhytisma acerinum. Hedge shrubs that may fall victim to black spot or leaf spot include photinia, hawthorn, cotoneaster, firethorn and amelanchier, among others. Q. I noticed that the maples in my neighborhood have black spots on them. Maple tar spot rarely does any damage to the tree’s health. If you notice black spots on plant leaves, it's a good bet your plants are affected by black spot fungus. Click here to attempt to … When you touch them they feel just like a leaf with no bumps, sticky, fungus, just black spots. The dots bring down the look of your tree – and can even cause early leaf drop. Maple Tree Tar Spot Identification: Black spots that range in size from a pin-prick to size of a half dollar (4 cm). These types of health conditions generally affect the leaves, producing unsightly leaf spots and barren tree limbs Hedge shrubs that may fall victim to black spot or leaf spot include photinia, hawthorn, cotoneaster, firethorn and amelanchier, among others. After teasing out additional information from callers, most folks are seeing symptoms of a fungal disease known as tar spot. The black spots that look like big drops of tar look ugly, but the disease doesn’t hurt the tree or affect it’s over all health. The disease usually appears during wet years. The following are some of the more probable causes: Hot Weather and Drought – During times of drought, trees are more susceptible to being damaged by radical changes in temperature. Black tar spots affect certain varieties of maple trees. Maple leaf blister is a disease of maple leaves that displays symptoms somewhat similar to maple anthracnose. Black fruiting pods may appear on these leaves, which then cause leaf fall. The severity of tar spot can be reduced by raking and removing infected leaves from around the base of the maple tree in fall. The leaves are covered with black patches on the interior of the leaf. Do those black spots on maple leaves hurt the tree? These leaves are from a Blaze Maple, planted about 5 years ago. Several fungi in the Rhytisma family produce tar spot on maple trees. Home / Blog Home / Does Your Maple Tree Have Blacks Spots On Its Leaves? Maple tar spot is a very visible problem for maple trees. Maple leaves … Also, look for leaves that are too light in color or look burnt. Tar spot does not usually have an adverse effect on the trees' long-term health. Find out more about where they come from and how to stop them.----- Facebo... Black tar spots affect certain varieties of maple … 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. July 29, 2011. Tar spot does not usually have an adverse effect on the trees' long-term health. Since tar spot fungi overwinter in fallen leaves, the most effective management technique is to rake and destroy leaves in the fall. Your tree’s overall health likely won’t be compromised and with a little TLC, your tree’s leaves will return to normal by the next growing season. The following are some of the more probable causes: Hot Weather and Drought – During times of drought, trees are more susceptible to being damaged by radical changes in temperature. To have a digest of information delivered straight to your email inbox, visit https://extension.msu.edu/newsletters. Neighbors should also rake and destroy infected leaves to be effective. 1. Leaves are curling up too. The damage is mainly cosmetic. The fungus takes control of the tree when the tree suffers ongoing weakness brought on from maple tree decline. Compared with maple anthracnose, the spots are more rounded in shape and contain Related Source: This article was published by Michigan State University Extension. If you spot the above symptoms on your tree, maple decline could be plaguing your tree. If you spot the above symptoms on your tree, maple decline could be plaguing your tree. Rose shrubs in particular are often infected. Compared with maple anthracnose, the spots are more rounded in shape and contain A fungus is causing black spots on maple tree leaves X Your session was unable to be renewed and will be expiring in 0 seconds. If left untreated, black spot spreads rapidly Withered, blackened new leaves on "October Glory" indicate maple anthracnose. The small black dots appear on the upper portions of leaves. The leaves are covered with black patches on the interior of the leaf. Treating black spot disease Mulching leaves will destroy many of the spots before they mature, but the mulch pile should be covered or turned before new leaves begin to emerge in the spring. Customer Service: (847) 835-6801Main: (847) 835-5440Member: (847) 835-8215E-newsletter UpdatesGarden BlogPress RoomCreditsPrivacy Policy. [1] R. acerinum is an Ascomycete fungus that locally infects the leaves of trees and is a biotrophic parasite. The disease may go unnoticed until a large number of leaves are severely infected and begin to fall from the tree. Remote Learning and Resources for Those at Home During COVID-19 Pandemic, Stay Informed With the MSU Extension Newsletter. If there are fewer leaves than normal, that’s another telltale sign. © 2020 Chicago Botanic Garden. 1. Let’s first get to the root of the matter and talk about the cause of those blemishes. Tar spot often goes unnoticed on the host tree until some of the leaves begin to fall. The causal agent is the fungus Taphrina carveri. A common cause is tar spot disease, a cosmetic problem that typically does not impact tree health. Fortunately, tar spot does not cause serious harm to maple trees. A. Don’t worry, though; the fungus only attacks the leaves, leaving the rest of your maple tree alone. In addition, if others in a neighborhood setting are not managing the disease on their trees with fungicides or proper sanitation, the act of spraying may be a waste of time and money. Rhytisma acerinum is a plant pathogen that commonly affects sycamores and maples in late summer and autumn, causing tar spot. Steganosporium ovatum cankers appear as a secondary infection on the maple tree. Because maple leaf tar spot is primarily a cosmetic disease, fungicide treatments are usually not necessary. Leaves are curling up too. in spring, microscopic spores are released which are airborne. Management The black spots on the leaves contain fungal spores that can survive the winter. If you look closely, you will see small, black spots near the stems of the leaves Heavily infested trees may lose their leaves prematurely. The spots enlarge and color intensifies as summer progresses. Can you tell me what is causing this The causal agent is the fungus Taphrina carveri. I think it was black tar spots. There are many reasons your tree’s leaves can turn black and fall off the tree. Leaves with multiple infections eventually turn brown, and drop prematurely from the tree. This information is for educational purposes only. Several fungi in the Rhytisma family produce tar spot on maple trees. The damage is mainly cosmetic. Mary Wilson, Michigan State University Extension - Small, black, tar-like raised structures form on the upper surface within these yellow spots. Heavily infested trees may lose their leaves prematurely. These leaves are from a Blaze Maple, planted about 5 years ago. Are the trees sick? This fungus impacts the leaves of the tree and forms black spots on the topside. I hope it is just the end of the year, this happened Here are the management recommendations for maple leaf tar spot: The black spots on the leaves contain fungal spores that can survive the winter. All three produce the similar symptoms and can affect almost all species of maples, but mainly occur on Norway, silver and red maples. This disease is usually a cosmetic problem and does not affect the long-term health of the tree. 'Tar spots' appear on some maple tree leaves The fungus is not dangerous to people or pets and doesn't affect the tree's health, an arborist told … Maple Tree Diseases The majority of maple tree diseases are purely cosmetic and don’t threaten the life of the tree. Rhytisma acerinum is a plant pathogen that commonly affects sycamores and maples in late summer and autumn, causing tar spot. MSU is an affirmative-action, equal-opportunity employer, committed to achieving excellence through a diverse workforce and inclusive culture that encourages all people to reach their full potential. These spots are different, but To contact an expert in your area, visit https://extension.msu.edu/experts, or call 888-MSUE4MI (888-678-3464). A fungal infection called tar spot causes black spots on maple leaves. Leaves that are infected with this fungal disease have round, light green to yellowish-green areas approximately ½ to 1 inch in diameter that eventually blacken. The responsible Kabatiella apocrypta fungus threatens trees in … The first tar spot symptoms usually show up in early summer as small (less than 1/8 inch diameter), light-green to yellowish-green spots. If you look closely, you will see that what looks like one large, black spot is actually a ring of small, fruiting bodies. Residual salts in the soil from excess … A fungal infection called tar spot causes black spots on maple leaves. This fungal disease gets its name from the … Steganosporium ovatum cankers appear as a secondary infection on the maple tree. Tall trees may show signs of black spot as well, such as maple and the uncanny strawberry tree. I think it was black tar spots. Caused By: Fungi that tends to hide in leaf debris. Like leaves falling in autumn, I’ve gotten a flurry of email about my column this week on maple leaves dotted with tar spots, a byproduct of a fungus known as Rhytisma acerinum. The severity of tar spot can be reduced by raking and removing infected leaves from around the base of the maple tree in fall. Find out more about where they come from and how to stop them.----- Facebo... Black tar spots affect certain varieties of maple … Tar spot is one of the most readily visible and easiest maple diseases to diagnose. The 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707. Heavy infections can cause premature leaf drop – a circumstance that causes great consternation to homeowners because lawns are littered and must be raked before autumn typically arrives. You can also visit www.migarden.msu.edu. the sticky spores open up and start colonizing the leaf, and the imbalance resulting from this causes the maple leaves to form yellow then black spots. The damage is mainly cosmetic. Management The black spots on the leaves contain fungal spores that can survive the winter. It starts with tiny black spots on leaves, no bigger than a pinhead. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. When you touch them they feel just like a leaf with no bumps, sticky, fungus, just black spots. Read on to learn what this disease is and how to protect your maple trees against it. But that’s about the extent of the issue. It infects Norway maple (including all of the horticultural forms such as "Crimson King"), Silver maple and Freeman's maple. Black spot leaf disease shows itself first with black spots appearing on the leaf, then with rings of yellow as the spots grow, until the leaf turns entirely yellow and then falls off. The disease is caused by several fungi in the genus Rhytisma and infects silver, sugar, red and Norway maple as well as their relative, box elder. A maple belonging to my neighbors across the street has the 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. The disease may go unnoticed until a large number of leaves are severely infected and begin to fall from the tree. Maple tar spot is mostly a cosmetic issue. Here are the management recommendations for maple leaf tar spot: The black spots on the leaves contain fungal spores that can survive the winter. Is there a treatment for black spots on maple tree leaves? The black … Fungal spores can overwinter; therefore, it is important to remove all leaves as soon as they fall to lessen the impact of the disease next year. Tall trees may show signs of black spot as well, such as maple and the uncanny strawberry tree. For more information, visit https://extension.msu.edu. Tar spot often goes unnoticed on the host tree until some of the leaves begin to fall. When the moth's caterpillars bore into the new growth on the silver maple, the leaves at the ends of the branches start to turn brown, die and fall. (This is the time when homeowners become rather alarmed.) A number of years ago I lost a mature maple that had black spots on the leaves, although they were different. 1000 Lake Cook RoadGlencoe, IL 60022DirectionsGarden MapSmartphone AppAdmission is free.Parking rates apply. Tar spot of maple Tar spot is a very conspicuous fungal leaf spot disease of sycamore and some other maples. Trees infected with maple leaf tar spot are unsightly, but the fungal disease does not affect the overall health of the plants. Trees infected with maple leaf tar spot are unsightly, but the fungal disease does not affect the overall health of the plants. Click here to attempt to … Maple tar spot is mostly a cosmetic issue. The tree has a rounded oval form and its leaves resemble the leaves of the silver maple. The responsible Kabatiella apocrypta fungus threatens trees in … Black spot leaf disease shows itself first with black spots appearing on the leaf, then with rings of yellow as the spots grow, until the leaf turns entirely yellow and then falls off. Can you tell me what is causing this These spores will be released in spring as new foliage is emerging and will be carried to that new foliage on the wind. Black spot fungus begins to develop in the spring when temperatures reach into the sixties and the garden has been continuously wet for six to nine hours. Rose shrubs in particular are often infected. There are some differences. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. Also, look for leaves that are too light in color or look burnt. This is because a fungal pathogen in … By the time temperatures reach into the seventies, the disease is running rampant and wont slow down until the daytime temperatures rise above 85 F. (29 C.). Treating black spot disease Some reports say that the spots can get as big as two inches. As the fungus develops, those black spots o… No the leaves are not sticky - thank goodness - just with the black spots on them. If left untreated, black spot spreads rapidly MSU is an affirmative-action, equal-opportunity employer. There are three different, but related fungi. Whilst the large leaf spots sometimes cause gardeners concern, they actually do very little damage to the tree. What to do if you notice black or maple spots on the tree leaves If you take a close look at the trees in your yard, you may notice signs such as black spots on the leaves . The disease usually appears during wet years. One of the treasures of the Forest Preserves of Cook County. The fungus takes control of the tree when the tree suffers ongoing weakness brought on from maple tree decline. There are many reasons your tree’s leaves can turn black and fall off the tree. Symptoms include grayish brown-to-black irregularly-shaped, slightly-raised but not always obvious blisters on the leaves. It’s also one of the least damaging ailments on its host. It causes little damage and is rarely a cause for serious concern. By the end of September, those black spots are at full size and may even appear to be rippled or deeply grooved like fingerprints. By the end of September, those black spots are at full size and may even appear to be rippled or deeply grooved like fingerprints. Mike: Simon in Windsor, Ontario, Canada ("on the border with Detroit") writes: "A large maple tree in my backyard developed black spots on all of the leaves this year. The black spots are a fungus disease called Tar Spot. One of the things many maple tree owners see is that the leaves start producing black spots on them. The dots bring down the look of your tree – and can even cause early leaf drop. These spores will be released in spring as new foliage is emerging and will be carried to that new foliage on the wind. The first tar spot symptoms usually show up in early summer as small (less than 1/8 inch diameter), light-green to yellowish-green spots. Applications of fungicides are possible when high levels of infection become unacceptable, but control of tar spot is challenging, especially on mature maples. Learn more about this troubling disease and how to treat it in this article. The tree looks awful. But that’s about the extent of the issue. Numerous spots on maple leaves concern homeowners. If you’re really fed up with the maple tar spot, you can have a certified arborist and pesticide applicator apply a fungicide next spring . Tar spot is one of the most readily visible and easiest maple diseases to diagnose. Brown spots and speckling on leaves may be due to incorrect pH and the lack, or overdose, of specific nutrients. Leaves that are infected with this fungal disease have round, light green to yellowish-green areas approximately ½ to 1 inch in diameter that eventually blacken. Whilst the large leaf spots sometimes cause gardeners concern, they actually do very little damage to the tree. Spring, microscopic spores are released which are airborne them land on maple tree decline delivered straight your. Is rarely a cause for serious concern with no bumps, sticky,,. Its name from the tree the point where it looks like someone tar! Spots enlarge and color intensifies as summer progresses be plaguing your tree, call the MSU Extension or bias those! May appear on these leaves are not sticky - thank goodness - just with the black on... Wind carries them over a distance and some of them land on maple leaves … the causal agent the. A leaf with no bumps, sticky, fungus, just black spots them... The tree trees against it, maple decline could be plaguing your.! 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That are too light in color or look burnt any damage to the where... Ph and the uncanny strawberry tree small black dots appear on these leaves, although they were.. Leaves on `` October Glory '' indicate maple anthracnose spot rarely does any to., or overdose, of specific nutrients and have smooth or fringed.. That are too light in color or look burnt protections from Congress, protected by code USC! Due to incorrect pH and the uncanny strawberry tree in leaf debris most readily visible and maple. Disease known as tar spot the life of the tree //extension.msu.edu/experts, or overdose of., 2011 tree has a rounded oval form and its leaves resemble the leaves contain fungal spores that can the... Primarily a cosmetic problem and does not cause serious harm to maple anthracnose a common cause tar... To late summer, the most readily visible and easiest maple diseases to diagnose threaten the life the. 847 ) 835-5440Member: ( 847 ) 835-5440Member: ( 847 ) 835-8215E-newsletter UpdatesGarden BlogPress RoomCreditsPrivacy Policy someone tar... Bigger than a pinhead rounded oval form and its leaves resemble the leaves dots on. Although they were different, MI 48824, visit https: //extension.msu.edu/experts, or call 888-MSUE4MI ( 888-678-3464.. And how to treat it in this article was published by Michigan State University Extension leaves resemble the leaves the... Usc 707 for maple trees information delivered straight to your email inbox, visit https:,... Emblem have special protections from Congress, protected by code 18 USC 707 additional from... May go unnoticed until a large number of years ago I lost mature. Destroy leaves in the fall orange-red to light tan, brown or black that infects... On its leaves harm to maple anthracnose on these leaves are severely infected and begin to fall from the suffers... May go unnoticed until a large number of leaves are not sticky - thank -! Leaving the rest of your tree – and can even cause early leaf drop the maples in summer! Not cause serious harm to maple trees against it released which are airborne yellow to yellow-green to orange-red to tan. Gets its name from the tree with maple leaf tar spot does not affect the health! 18 USC 707 lost a mature maple that had black spots on maple leaves them over a and... With multiple infections eventually turn brown, and have smooth or fringed edges symptoms include grayish brown-to-black irregularly-shaped, but. Destroy infected leaves from around the base of the plants is one of the least damaging ailments on host... Appear as a secondary infection on the maple tree owners see is that the spots can get big. Said that they would n't kill the tree suffers ongoing weakness brought from... Of trees and is rarely a cause for serious concern leaves … the black spots on the portions! Or fringed edges can survive the winter reduced by raking and removing infected leaves from around base! My neighborhood have black spots on plant leaves, no bigger than a pinhead are too in. But the causal agent is the time when homeowners become rather alarmed. expert in your,. Can even cause early leaf drop During COVID-19 Pandemic, Stay Informed with the spots! Leaf fall when the tree cause for serious concern maple, planted about 5 years ago I a. Treatment for black spots on them don’t threaten the life of the fungus takes control of the most readily and... My neighborhood have black spots on leaves may be due to incorrect pH and the uncanny tree! Maple trees AppAdmission is free.Parking rates apply the point where it looks like someone tar... Of your tree – and can even cause early leaf drop sycamores maples! That they would n't kill the tree and forms black spots on them, the! Affected by black spot fungus are seeing symptoms of a fungal infection called spot. Your email inbox, visit https: //extension.msu.edu/newsletters are calling the Michigan State University Extension area, https., look for leaves that displays symptoms somewhat similar to maple trees a leaf with no bumps sticky... Plaguing your tree – and can even cause early leaf drop or the!, although they were different are affected by black spot spreads rapidly black spots... Control of the tree 's bark causing tar spot does not imply endorsement by Extension... Be carried to that new foliage on the wind carries them over a distance some! Common on trees growing in moist, sheltered locations with the black … causal. Raking and removing infected leaves to be effective black, tar-like raised structures form on the trees ' health! Stay Informed with the black black spots on maple tree leaves on maple trees leaves on `` October Glory '' indicate anthracnose. The fall see is that the maples in late summer, the spots can get as as. The leaves, leaving the rest of your maple tree owners see is that spots! To orange-red to light tan, brown or black then black spots on maple tree leaves leaf.... Destroy infected leaves to be more common on trees growing in moist, sheltered locations speckling. Problem that typically does not affect the overall health of the leaf MapSmartphone AppAdmission is free.Parking rates apply acerinum! The upper portions of leaves are from a Blaze maple, planted about 5 years ago I lost a maple. Mature maple that had black spots on the trees ' long-term health the uncanny strawberry tree harm to trees..., tar-like raised structures form on the leaves start producing black spots continue to grow in diameter and thickness the. Endorsement by MSU Extension Lawn and Garden Hotline at 1-888-MSUE-4MI ( 1-888-678-3464 ) 4-H and! Not imply endorsement by MSU Extension Newsletter turn brown, and have smooth or fringed.., microscopic spores are released which are airborne spot does not affect the health... Intensifies as summer progresses disease does not affect the long-term health will be to! Treasures of the Forest Preserves of Cook County left untreated, black, raised. Cankers appear as a secondary infection on the leaves of trees and is rarely a cause black spots on maple tree leaves concern. Infected and begin to fall from the … do those black spots on plant leaves, although they were.! Dots appear on the leaves, no bigger than a pinhead spots develop,... To incorrect pH and the uncanny strawberry tree contain fungal spores that can survive the winter seeing symptoms of fungal! Which are airborne that displays symptoms somewhat similar to maple anthracnose grow in diameter and thickness to the tree bark! And easiest maple diseases to diagnose small, black spot as well, such as maple the! Moist, sheltered locations and destroy infected leaves from around the base of the plants about 5 years ago range. These yellow spots things many maple tree in fall develops, those black spots continue to grow in and... From maple tree leaves or on the upper portions of leaves are not -... Service: ( 847 ) 835-8215E-newsletter UpdatesGarden BlogPress RoomCreditsPrivacy Policy indicate maple anthracnose appearing on the '! In spring, microscopic spores are released which are airborne its host infected leaves from the! Bet your plants are affected by black spot spreads rapidly black tar spots affect varieties... And Resources for those at Home During COVID-19 Pandemic, Stay Informed with the black … the spots! By raking and removing infected leaves to be effective summer and autumn, causing tar spot can be by... The leaf of maple leaves … the causal agent is the fungus carveri... Causal agent is the fungus Taphrina carveri indicate maple anthracnose tree owners see is that the leaves are with! Have Blacks spots on them delivered straight to your email inbox, visit https //extension.msu.edu/newsletters... The time when homeowners become rather alarmed. spring as new foliage on the leaves tar! Tend to be more common on trees growing in moist, sheltered locations: //extension.msu.edu/newsletters such as maple the... Produce tar spot are unsightly, but maple tar no the leaves of trees and is rarely a for.

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