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White Spots on Maple Tree Bark: Causes And Treatment Options

Dr Ahsanur Rahman, PHD

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Dr Ahsanur Rahman, PhD, is a Bangladeshi forest researcher who has worked extensively on the ecology and management of the country's forests. He has authored or co-authored over 100 scientific papers and is widely recognized as an expert on the subject. Dr Rahman is currently working as a senior Research Officer at, Forest Protection Division (Forest Pathology), Bangladesh Forest Research Institute, Chittagong, Bangladesh.

Name: Dr Ahsanur Rahman, PHD

Email: [email protected]

There are several potential causes of white spots on maple tree bark. These include injury, pests, disease, and environmental stressors. Treatment options will vary depending on the underlying cause.

In some cases, such as with pest infestations or injuries, no treatment may be necessary. In others, such as with diseases, pruning and fungicide treatments may be required. Environmental stressors can often be addressed by improving growing conditions or protecting trees from harsh weather conditions.

If you have a maple tree with white spots on the bark, don’t panic! This is a common problem that can usually be easily remedied. The most likely cause of white spots on maple tree bark is sunscald.

Sunscald occurs when the bark is exposed to direct sunlight for extended periods of time. The hot sun can damage the cells in the outer layers of the bark, causing them to die and turn white. Fortunately, sunscald is not fatal to trees and the damage is usually only cosmetic.

However, if left untreated, sunscald can lead to more serious problems like canker diseases or borers. To prevent sunscald, simply cover any affected areas with burlap or another type of protective covering. Another possible cause of white spots on maple tree bark is powdery mildew.

Powdery mildew is a fungal disease that affects many different types of plants, including maples. The fungus causes a white powdery growth to form on the leaves and stems of infected plants. In severe cases, it can also affect the bark.

Powdery mildew is most likely to occur in humid conditions with little air circulation. To prevent this disease, make sure your maple tree has plenty of space around it for air to circulate freely. If powdery mildew does occur, there are several fungicides available that will treat it effectively.

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What are the White Spots on My Maple Tree Bark?

If you have noticed white spots on the bark of your maple tree, don’t worry – this is normal! These spots are called lenticels, and they serve an important purpose. Lenticels are pores that allow gas exchange between the atmosphere and the interior of the tree.

They are especially important for young trees, which need to take in large amounts of carbon dioxide for photosynthesis. Lenticels are usually oval or circular in shape, and range in size from a few millimeters to a few centimeters. They can be raised or flush with the surface of the bark.

The number of lenticels on a tree varies depending on the species – maples typically have more than other types of trees. Lenticels can become damaged or blocked due to injury, disease, or pests. If this happens, it can prevent the tree from taking in vital gases and lead to its death.

Therefore, it’s important to keep an eye on your tree’s lenticels and make sure they remain clear and open!

How Do You Treat Maple Bark Fungus?

If you have maple bark fungus, also called Nectria cinnabarina, the first thing you should do is identify the affected tree. This fungus usually affects sugar maples, but it can also infect red maples and Norway maples. Once you’ve identified the affected tree, you need to take action to treat the fungus.

The best way to treat maple bark fungus is to remove any infected branches. Cut off the branch at least 6 inches below the point of infection and dispose of it properly. You should also clean up any fallen leaves or branches from around the base of the tree.

Once you’ve removed all of the infected material, you need to disinfect your pruning tools. Use a household disinfectant or a solution of one part bleach to nine parts water. This will help prevent the spread of the fungus to other trees.

You should also consider applying a fungicide to the affected tree. There are several different fungicides available that are effective against maple bark fungus. Be sure to follow all label directions carefully when applying any chemicals to your trees.

Maple bark fungus can be difficult to control, but taking these steps will help reduce its spread and allow your trees to recover.

Why Does My Tree Trunk Have White Spots?

There are a few reasons why your tree trunk might have white spots. One possibility is that the tree is suffering from a fungal infection called powdery mildew. This type of fungus thrives in humid conditions and can cause the leaves of affected trees to turn yellow and develop white spots.

The fungus can also spread to the trunk, causing the white spots you’re seeing. If left untreated, powdery mildew can eventually kill the tree. Another possibility is that the white spots are caused by sunscald.

This happens when the bark of a tree is exposed to direct sunlight for extended periods of time. The heat from the sun can cause the bark to blister and peel, revealing the lighter-colored wood underneath. In some cases, sunscald can lead to cracks in the bark, which provide entry points for pests and diseases.

If you’re not sure what’s causing the white spots on your tree trunk, it’s best to consult with a certified arborist or other tree care professional who can properly diagnose the problem and recommend treatment options.

Why Does My Maple Tree Have White Spots on the Leaves?

Leaf spot diseases are caused by various fungi that attack the leaves of trees and shrubs. These fungi overwinter in fallen leaves, twigs, or other debris beneath the tree. In spring, they produce spores that are spread by wind or splashing raindrops to new host leaves where they cause spots.

The most common leaf spot diseases of maple are caused by two closely related fungi: Cercospora species and Marssonina species. Cercospora Leaf Spot – Cercospora species generally cause small (1/8 inch), circular to angular, brownish to purplish-black lesions with pale gray centers on the upper surface of maple leaves. They may be numerous enough to cause early defoliation.

Severely affected leaves may drop prematurely. On occasion, these fungi can also infect branches causing them to die back. Two common fungal pathogens in this group include Cercospora apii which affects celery and parsley, and Cercospora beticola which attacks sugar beet leaves.

Marssonina Leaf Spot – Marssonina species typically cause large (up to 1/2 inch), irregularly shaped tan to dark brown lesions with purple margins on the lower surface of maple leaves. As the disease progresses, entire leaflets may turn brown and wither away leaving behind only the petiole attached to the stem. These fungi are often more damaging on young seedlings or transplants than established trees because they can quickly overwhelm a small leaf area.

White Spots on Maple Tree Bark: Causes And Treatment Options


White Fungus on Maple Tree Leaves

If you have a maple tree in your yard, you may have noticed some white fungus growing on the leaves. This is a common problem that can be caused by several different types of fungi. The most common type of fungus that causes this problem is called powdery mildew.

Powdery mildew is a white powdery substance that can be found on the tops and bottoms of leaves. It is most commonly found in late summer or early fall. There are several other types of fungi that can cause this problem as well, such as black mold and cedar-apple rust.

If you think you may have one of these other types of fungi, it is best to consult with a professional to get an accurate diagnosis. The good news is that there are several things you can do to treat white fungus on your maple tree leaves. One option is to use a fungicide specifically designed for this purpose.

You can also try using a mixture of water and baking soda, which can help to kill the fungus and prevent it from spreading. Whatever treatment option you choose, make sure to follow the instructions carefully and reapply as needed until the fungus is gone completely.

White Spots on Japanese Maple Tree Leaves

If you have a Japanese maple tree, you may have noticed some white spots on the leaves. These spots are caused by a fungus called powdery mildew. Powdery mildew is a common problem on many types of trees and shrubs, but it is especially prevalent on Japanese maples.

The good news is that powdery mildew is not harmful to the tree and will not kill it. However, the fungus can cause the leaves to become discolored and distorted. In severe cases, the leaves may drop off prematurely.

There are several things you can do to control powdery mildew on your Japanese maple tree: 1) Plant resistant varieties – Some varieties of Japanese maple are more resistant to powdery mildew than others. When choosing a tree for your garden, ask your nursery or garden center if they have any powdery mildew-resistant varieties available.

2) Provide adequate air circulation – Good air circulation around the tree will help to prevent powdery mildew from developing in the first place. Make sure there is plenty of space between plants in your garden so that air can circulate freely. Additionally, avoid watering the leaves of the tree directly as wet leaves are more susceptible to fungal growth.

Water early in the day so that the leaves have time to dry before nightfall when humidity levels are typically higher. 3) Apply fungicide – If your tree already has powdery mildew, you can apply a fungicide to help control it. Be sure to follow all instructions carefully and reapply as directed since fungicides only provide temporary relief from this problem.

Maple Tree White Bark

If you’re lucky enough to have a maple tree in your yard, you may have noticed that the bark is sometimes white. This is caused by a condition called “ghosting” and it’s actually pretty common in maple trees. Ghosting occurs when the tree’s outer layer of bark dies and peels away, revealing the lighter inner bark beneath.

It’s most often seen on young trees or branches, but can also happen to older trees. Ghosting is usually not harmful to the tree and will eventually go away on its own as the tree grows and sheds its dead bark. However, if ghosting is severe or happens repeatedly, it can weaken the tree and make it more susceptible to disease or insect infestation.

If you’re concerned about your tree, be sure to talk to a certified arborist or other tree expert for advice.

White Spots on Acer Trunk

If you have an Acer tree with white spots on the trunk, it’s likely that the tree is suffering from a condition called leprosy. Leprosy is caused by a fungus called Monilinia fructigena, which infects the tree through wounds in the bark. The fungus causes the tree to produce abnormal growths of tissue, which eventually turn white.

The spots can range in size from a few millimeters to several centimeters. Leprosy is a serious condition that can ultimately kill an Acer tree. If you notice white spots on your tree’s trunk, it’s important to contact a certified arborist or other professional for diagnosis and treatment recommendations.


If you have noticed white spots on the bark of your maple tree, don’t panic! This is a common issue that can be caused by a few different things. The most likely culprit is a fungal disease called powdery mildew.

This disease is caused by too much moisture and not enough air circulation around the tree. Luckily, it is relatively easy to treat with fungicide. If the problem persists, you may need to thin out the canopy of your tree to allow more air flow.

Another possibility is sun scald, which happens when the bark gets too much direct sunlight. This can be prevented by wrapping the trunk of your tree in burlap or shading it with mulch. If you are unsure what is causing the white spots on your maple tree’s bark, contact a certified arborist for help.