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If you are looking for a beautiful plant with delicate leaves and a unique branching pattern, a Japanese maple tree is what you might be looking for.

However, Japanese maple tree owners have frequently complained about fungal diseases, also known as Japanese maple fungus. This article will learn how this fungus can cause severe damage to your tree if not attention.

Also, we’ll talk about how Japanese maple fungus affects tree health and its duty. Furthermore, we will also explore what you can do to protect your tree from this devastating disease and what are its different types.

Understanding Japanese maple fungus.

Japanese maple fungus is typically a fungal disease affecting trees’ roots and trunks. It can cause your maple tree to become infected, leading to the development of cankers on its chest and the eventual death of the tree if not paid attention to.

This is why I highly recommend you look for signs of fungus infection in Japanese maple, including discoloration of the bark, yellowing of the leaves, and building branches.

It would help if you never left it untreated, as these fungi are known to spread rapidly and cause irreparable harm to your tree.

There is usually three color Type of maple fungus:

  • Japanese maple green fungus. 
  • Japanese maple white fungus. 
  • Japanese maple yellow fungus.

To learn what type of Japanese maple fungus your tree is suffering from, it is essential to pay attention and treat it early. All three color types can cause severe harm and affect its health, growth, and appearance.

In the following section, I will help you explore all the possible reasons why Japanese maple fungus takes place in the first place and what you can do to treat teeth. Whether you are a seasoned gardener or a homeowner, this information will keep your maple tree healthy and beautiful for longevity.

Identify Japanese Maple Fungus.

Fortunately, you can quickly identify Japanese maple fungus with the naked eye full if you know what to look for. Just look at the symptoms like yellow leaves, bark discoloration, or wilting branches.

You may also notice the Presence of cankers on Japanese maple trunks, another sign of fungus infection. If you suspect your Japanese maple tree is suffering from any fungus, seek professional help as soon as possible.

I recommend you take preventive measures that help you prevent this kind of problem from recurring. There are mainly four different types of Japanese fungi that affect the tree.

Types of Japanese maple fungus.

  1. Verticillium Wilt: This fungal disease is hazardous because it attacks a Japanese maple tree root. If not treated, the branches will start to die as well.
  2. Tar Spot: If you notice a black spot on the leaves, this is due to a tar spot. The tar spot causes the leaves to turn black and eventually fall off, leaving the maple bear looking Unattractive.
  3. Powdery Mildew: It is a type of fungus that creates satisfactory white growth on maple tree leaves. If not treated, it will also turn yellow while affecting the foliage to die.
  4. Armillaria: Armillaria fungus that is known to attack the roots of trees, causing them to decline and eventually die Slowly.
  5. Sooty Mould: Sooty Mould is also a deadly fungal disease that causes maple tree leaves to turn black with sooty coating on the tree’s leaves and branches.
  6. Phytophthora Root Rot: it is a soil-borne fungal disease that will attack the root of a maple tree. If a Japanese maple tree is suffering from this disease, it could lead to root rot and a decline in its health.
  7. Anthracnose: If you notice leaf blight and cankers on trees along with branches and leaf spots, the Japanese maple tree is likely to suffer from anthracnose. It can be responsible for weakening the tree and making it more susceptible to other diseases and infestations.

It is essential to keep an eye on each of these symptoms to detect them at an early stage. Early detection will help you a lot in preventing the spread of Japanese maple and preserving the health of your tree’s health.

Here are a few tips that will help you detect Japanese maple fungus at an early stage.

  • It is essential to examine the root of the Japanese maple tree for signs of root rot like discoloration or mushiness. 
  • Make sure you are also checking the soil around the tree from time to time to ensure it is not waterlogging, which can encourage the risk of root rot.
  • Consider implementing preventive measures to reduce the risk of fungal diseases, like proper pruning, providing air circulation around your tree, and avoiding overwatering. 
  • It would help if you always kept an eye out for specific symptoms of the fungus mentioned above. 
  • Also, pay attention to the Japanese maple trunk for crackers and discoloration.

It is essential to pay attention to early detection since it helps prevent the spread of Japanese maple fungus.

If you identify the disease early, you will not only prevent further harm to your tree but also ensure the proper treatment is prescribed. When you look at the Japanese maple fungus, it usually tends to be in the following three colors.

Understanding & Treating Japanese Maple Green Fungus.

Fungus usually exhibits algae and leach Presence signs that are not always harmful to the tree. However, if you notice the green fungus or substance getting smelly or slimy, something is wrong.

It could signify a fungal infection like bacterial wet wood and slim flu. To treat fungal infections like narrow flux or bacterial damp wood, I recommend you remove the affected bark first.

After that, you should consider applying a fungicide, especially one with a label for the type of fungus you’re treating. Also, consider improving the overall health of your Japanese maple to help it recover from the infection sooner.

You can consider watering, fertilizing, and pruning to promote good air circulation & reduce the stress of your Japanese maple. Lastly, monitor its health for further signs of infection and take action to prevent problems from recurring.

Understanding & Treating Japanese Maple White Fungus. 

If you notice a white substance, it could be powdery Mildew. Powdery Mildew is a fungal disease that promotes satisfactory growth on a tree leaf, stems, and trunk, which usually looks white.

Powdery Mildew will not only form a fine white development of fungus but can also cause yellowing and curling of the leaves if not addressed properly.

I highly recommend you address this issue even though this does not cause any significant harm to the Japanese maple.

Firstly, dispose of any infected leaves and branches to reduce the spread of the disease. After that, consider improving air circulation and preventing future disease outbreaks by fertilizing the tree and providing appropriate fungicides.

Understanding And Treating Japanese Maple Yellow Fungus. 

If you notice yellow fungus on your Japanese maple tree, it could indicate a canker or wound infection. Fungal pathogens like verticillium wilt or phytophthora root rot usually cause these.

Do note that these diseases can cause serious harm to your tree if not paid attention to. If you don’t take proper precautions and treat the yellow fungus early, your Japanese maple trunk may eventually die.

Make sure the soil around the Japanese maple tree is dry to increase the risk of root rot.

After that, get professional help or advice from a certified arborist, even though it can be an expensive consultation. We’ve recently shared a guide on the cost of arborist consultation to get a rough idea of the estimated money you may pay.

7 Tips & Advice For You And Other Japanese Maple Tree Owners.

  1. Always ensure good quality pest and disease control and take action as needed to prevent and treat infestations. Regularly inspect your maple tree for signs of diseases and pests. 
  2. Only fertilize your Japanese maple tree when needed. It would help if you also considered using a well-balanced fertilizer specially formulated for Japanese map specimens. Get the one that is specially formulated for the deciduous tree.
  3. Make sure your tree is in a location that receives the proper amount of sunlight during the day.
  4. Keep pruning your Japanese maple regularly to remove dead or diseased branches. Proper pruning will also help you immensely, providing good air circulation around the tree and maintaining its shape. 
  5. Water your Japanese maple tree only when necessary. Make sure the water penetrates profoundly, and the soil is well draining. Avoid water overwatering, which can cause tree fruit rot.
  6. Consider applying a 2-3 inch layer of mulch around your Japanese maple base to protect it from cold temperatures. Consider leaving a few inches of space between the maple trunk and mulch.
  7. It is highly advised to consult a professional or get help from an arborist if you cannot identify the cause of any unusual change in your Japanese maple tree.

Preventing Japanese Maple Fungus.

Pruning will help prevent the fungus from spreading, and applying fungicide as a preventive measure during the growing season is a lifesaver.

It would help if you also considered watering the tree at its base instead of overhead which may increase the fungal growth. Also, make sure to provide adequate space to your tree for optimal growth and thriving in soil.

Consider choosing a Japanese maple species that are resistant to the fungus. Regular monitoring for signs of disease and stress can prevent most of the issues you are likely to face with your tree during its longevity.


Preventing and treating a Japanese maple fungus will require effort and a significate amount of your time. Also, ensure proper tree care and maintenance to treat a Japanese fungus.

It would help if you considered monitoring the tree regularly and watering it properly. Only consider fertilizing a Japanese maple if required and avoid stress or overcrowding.

If your tree is suffering from fungus, consider responding quickly by applying a fungicide and cutting branches using the right equipment. This can help you prevent unhealthy parts from causing further damage and also support your tree for fast recovery.

To regulate soil temperature and retain its moisture l, consider applying a 2-3 inch layer of munch in its base. If you find this article helpful, then consider sharing it. I tried to give you all the information about Japanese maple fungus symptoms, causes, and treatment.

Your share will help many people understand the type of fungus and how to treat it. Do check our other helpful guide on tree care. See you in the next post. Till then, take care and goodbye.