Japanese Maple Tree Diseases: 46 Facts

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46 Facts Japanese Maple Tree Diseases | Common Maple Tree Diseases, Symptoms, Treatment, and Prevention

• Maple trees are usually healthy and live for many, many years. There are a few diseases that can occur and it is helpful to be able to recognize them and even more helpful to know what steps can reduce the chances of them occurring. So what signs might be telling you that your maple tree is in trouble? - Source: Internet
• Maples are among the most popular trees for the garden, especially as shade trees. No wonder! With their iconic leaves and spectacular fall colors, these hardy trees will grow in many climate zones and many different conditions. As well, there are so many to choose from! Choose a grand Sugar maple or the smallest Japanese maple – there is a maple tree for every garden. - Source: Internet
• The next in this list is Anthracnose, which affects the maple tree leaves and branches. These are more active during the wet conditions in the spring season. It hampers the trees, leaves, and branches during the wet spring conditions. The leaves and branches closer to the ground or inside the tree are more vulnerable to infections, particularly during the early spring season. - Source: Internet
• This is one of the most concerning problems with Japanese Maple, where an entire branch can be affected. The initial symptom is discoloration of leaves and dying. Then, it will spread gradually to other healthy leaves on the same branch, affecting the branch itself. If not removed at the initial sighting of the symptom, the maple bonsai won’t last for a long time. - Source: Internet
• Aphids are sucking pests, often found in the leaves of the Japanese maples. These insects are relatively small and hard to identify. They take nutrients from the leaves, causing them to dry and fall off. Besides, the infestation usually occurs at a large scale, and multiple leaves are affected simultaneously. This reduces the canopy volume and minimizes the brilliance of the leaves. - Source: Internet
• All of these maples are susceptible to Maple Tar Spot because of their common plant genus, Acer. Whether or not your particular maple will develop Maple Tar Spot can depend on its surrounding environment. It’s more likely to become infected if there are many other infected trees in your neighborhoods, if you don’t take any preventive measures, or if spring weather has been particularly wet. - Source: Internet
• Maple Tar Spot and the maple trees it infects have evolved so that their annual patterns are in synch. Warm spring temperatures “wake up” both the fungus and the tree. Maples put out their new leaves, while winds and rains carry the fungus to them. - Source: Internet
• Japanese maple trees have never adapted well to over watering. They are highly susceptible to root rot because they have a low tolerance to soil that does not drain well. Proper planting and maintaining a watering regimen specific to Japanese Maple tree is the best treatment. - Source: Internet
• According to Landscape Ontario landscapeontario.com/japanese-maples“Once established, Japanese maples may be lightly fertilized only in the early spring (April) with 4-12-8 fertilizer or 15-30-15 water soluable mixture. Major structural trimming may be done before the new leaves unfurl in spring. Lighter pruning can be acomlished any time in June after the first major flush of growth begins”. - Source: Internet
• This is one of the most common but hazardous pests for the Japanese maple species. They have a white armored crust on top, within which the pests hide for protection. Their white armors are easy to spot when present on the stems and dark bars. Since they suck plant sap from within the stems and bark, you can see the leaves wilting earlier than the expected time, drying barks, and death in case of extreme infestation. - Source: Internet
• Soon after the sample was submitted, I received an email confirmation that the sample had maple leaf blister. And as part of the detailed report sent from the lab, was links to two resources, one from the University of Illinois and one from Michigan State University. The MSU resource was the same source that I came across that got me questioning that actual cause of the leaf drop. We are grateful to have the clinic and the opportunity to send samples for diagnostics and confirmation as needed in the diagnostic process here in Ohio. - Source: Internet
• Bacterial leaf scorch (red maple) Leaf margins on localized, individual branches brown in mid- to late July. The light-brown area is separated from green tissue by a dark reddish-brown band and a narrow but distinct yellow halo. Leaves may fall in August. Xylella fastidiosa Leafhoppers and spittle bugs carry the bacteria from tree to tree. Promote plant vigor by protecting the tree from stresses. - Source: Internet
• Scales are an occasional problem on maples. Perhaps the most common is cottony maple scale. The insect forms a cottony mass on the lower sides of branches. Scales are usually controlled with horticultural oil sprays. Scales may also be controlled with well-timed sprays to kill the crawlers. - Source: Internet
• The tree makes the best growth in wet places and has no other particular soil preference, except chlorosis may develop on alkaline soil where it also grows poorly. It is well suited as a street tree in northern and mid-south climates in residential and other suburban areas, but the bark is thin and easily damaged by mowers. Irrigation is often needed to support street tree plantings in well-drained soil in the south. Roots can raise sidewalks as silver maples can, but they have a less aggressive root system and so they make a good street tree. Surface roots beneath the canopy can make mowing difficult. - Source: Internet
• The outstanding ornamental characteristic of Red maple is red, orange, or yellow fall color (sometimes on the same tree) lasting several weeks. Red maple is often one of the first trees to color up in autumn, and it puts on one of the most brilliant displays of any tree, but trees vary greatly in fall color and intensity. Cultivars are more consistently colored. - Source: Internet
• Nutrient deficiency symptoms are yellow or yellowish-green leaves with darker green veins. The most commonly deficient nutrient on maple is manganese. Implanting capsules containing a manganese source in the trunk will alleviate the symptoms. Test soil samples to determine if the soil pH is too high for best manganese availability. Plants exposed to weed killers may also show similar symptoms. - Source: Internet
• While at the site, I took some photos and collected some leaves that had fallen and some still attached above. My initial thought was anthracnose, a common foliage disease that we see in the spring when weather conditions are favorable. Once back to the office, I began an email response to the person that reached out and was concerned about the trees in her neighborhood. As I was doing some research and finding links to resources that I could provide to the client that could easily be shared with others in her neighborhood, I came across some enlightening information from Michigan State University that covered maple anthracnose, and something called maple leaf blister (see link below). As I read more, I thought that what I was seeing actually fit the description of the maple leaf blister, more than anthracnose, even though I am sure I had called it anthracnose in the past. - Source: Internet
• In our area, you’ll also find other non-native maple species such as Sycamore Maple (Acer pseudoplatanus), Norway Maple (A. platanoides), and many cultivars of Japanese maples (A. japonicum and A. palmatum). - Source: Internet
• In conclusion, maple tree disease can make your tree ugly, adding a bad look to it. If the disease is fatal, it can even kill the tree. You can seek the help of professionals like Eden. Call for more information! - Source: Internet
• Maple Tar Spot is caused by one or more species of the fungus Rhytisma. Like many other fungi, Rhytisma has an annual life cycle that includes dormant overwintering. It’s followed by spring growth and release of fungal spores that are carried by wind and water to its host plants, our beloved maples. - Source: Internet
• This is a much more serious disease that affects all kinds of maples, but Sugar Maple and Silver Maple are the ones most commonly affected. It can also affect Japanese Maple. This disease is another fungus that enters through the roots and blocks the water passages inside the tree. The lack of water and nutrients flowing through the tree causes branches to die; at first small ones high up in the tree and later whole limbs lose their leaves and die. Often this is first noticed when a branch starts to show fall colors in late summer, long before other trees begin to color at all. - Source: Internet
• Diverse kinds of powdery mildew impact different types of maple trees. In every case, you can find different diseases that are not very fatal as the powdery substance only sits over the leaf surfaces. The root system is not invaded, and the powdery mildew fungus never affects the leaves. - Source: Internet
• If mushrooms are growing on your maple tree’s trunk or roots, you may have a severe problem. The presence of mushrooms and mushroom conks is a sign that the pulp of your tree is rotting. The fungi that produce mushrooms (the fruiting body of the fungus) flourish when fed by decaying organic material. - Source: Internet
• It is dark that appears like a star pattern, as seen like the rings on the chopped trunk of a tree. It also threatens sugar maples, particularly entering via the damaged roots. Once sapstreak fungus enters the tree, it hampers the roots, particularly in the sugar maple tree. It blocks the entry of nutrients to the leaves and branches. - Source: Internet
• The best treatment you have against this ailment is through proper maintenance. These are more active during summer, typically in July and August. The risk level for this ailment is low, as most maple trees are not affected severely. They remain affected mildly and for a short time. You can remove the severely affected plants. - Source: Internet
• But back to the client’s situation and the concern about the spots on the leaves and them dropping prematurely on the lawn below. I went out to the site and identified the maple as a red maple, and noticed in the neighborhood that every other condo had a red maple and all were exhibiting the same brown spots on the leaves, and were dropping leaves. While if you looked at the ground, there was a noticeable amount of leaves on the ground, but if you looked into the canopy, the trees were still full and dense. The photo below shows the full canopy. You will also noticed that there aren’t many leaves on the ground as the grass had been recently mowed. - Source: Internet
• In pop culture, comic book villains such as Captain Cold, Mr. Freeze, and Killer Frost wield the cold with nefarious intentions… and while there aren’t any evildoers walking around the real world with cold guns or cryokinetic abilities, the destructive power of frost is all too real. Especially for maples. - Source: Internet
• Trees respond to wounding or injury by forming specialized “callus” tissue around the edges of the wound. Thus, the tree responds to the injury by “compartmentalizing” or isolating the older, injured tissue with the gradual growth of new, healthy tissue. Not only do trees try to close the damaged tissue from the outside, they also make the existing wood surrounding the wound unsuitable for spread of decay organisms. Often a raised area of “callus tissue” will develop in the tree’s attempt to close the wound. However, even a slight opening may be enough to allow insect pests and fungal diseases to infest or infect the tree. - Source: Internet
• As Maple Tar Spot matures, its spots may become raised, textured, or just more visible. When a maple has high levels of the fungus it may begin to drop leaves in response, when those leaves are too damaged to photosynthesize. This is a stress response and does not indicate that your tree is dying. - Source: Internet
• If you send samples to the PPDC, be sure that you are sending fresh samples that are shipped or delivered quickly. I have always said - the better the sample, the better the diagnosis will be. Links to forms and additional information can be found on the PPDC website. Additionally, the clinic is listing weekly summaries of what samples were received and the diagnosis made under the tab, weekly summaries. I did learn that a second sample was received from Franklin County with the maple leaf blister last week as well. - Source: Internet
• Like any other bonsai plant, the Japanese Maple is prone to many diseases and damage from pests. Since the plant is so delicate, taking proper care is necessary. But to do so, you must have a clear idea about these most common report this adpests and diseases that can affect the brilliance of the plant. - Source: Internet
• Tar spot Oval to irregularly shaped, shiny, black spots up to ½ inch in diameter form on the leaves of silver or red maples. Rhytisma acerinum or R. punctatum No control measures are necessary. - Source: Internet
• Like anthracnose, maple leaf blister is unlikely to threaten a healthy tree, and cultural practices described for anthracnose can reduce spread of the fungus and the risk of serious damage to the tree. Ensuring sufficient water of approximately 1 inch per week will support the tree through the stress of disease and leaf regrowth. And like with many diseases, maintaining sufficient spacing for airflow between trees creates an environment that is less favorable for fungal growth and removing symptomatic leaves after they fall can help reduce the spread of the disease-causing fungi. - Source: Internet
• If you are seeing what appears to be maple leaf blister, send an email to stone.91@osu.edu with a photo if possible. Happy diagnosing this season and don’t forget to use the 20 Questions of Diagnostic FactSheet! - Source: Internet
• It may not be a life-threatening ailment but only a fungal infection, which affects the maple tree leaves. The leaves have several spots of different sizes at a time, which can lead to premature leaf drop. Some symptoms include yellow spots on the spots, which later turn into black, appearing like tar-like spots. The cause behind this ailment is the fungus called Rhytisma. - Source: Internet
• Aphids infest maples, usually Norway maple, and may be numerous at times. High populations can cause leaf drop. Another sign of heavy aphid infestation is honey dew on lower leaves and objects beneath the tree. Aphids are controlled by spraying or they may be left alone. If not sprayed, predatory insects will bring the aphid population under control. - Source: Internet
• This is one of the most common diseases that most Japanese maple bonsais are affected by. Here, the top surface of the leaves forms a white, powdery layer caused due to mildew fungus. If you have kept the bonsai in a humid area or under direct sunlight, the chances of powdery mildew grow by ten times. The related fungus also thrives when the leaves of the maple bonsai don’t receive enough air. - Source: Internet
• There is a recently introduced hybrid cross between red and silver maple called hybrid maple ( x ). Cultivars of this hybrid include ‘Armstrong’ with a narrow columnar crown to 35 feet tall, ‘Autumn Blaze’ with an oval crown to 50 feet tall, ‘Celebration’ with a narrow upright crown and a strong central leader to 50 or 60 feet tall, ‘Celzam’ with a narrow oval crown to 50 feet tall, and ‘Scarlet Sentenial’ with great fall color, and oval crown to 40 feet tall. The culture of these trees is probably similar to Red maple. - Source: Internet
• When it comes to maple trees, the foliage gets all the attention… and why wouldn’t it? In addition to having an iconic shape and providing bountiful shade from the sun, Acer leaves reveal beautiful shades of red, orange, and yellow in autumn. A maple’s foliage is arguably its best feature. But the bark of a maple plays an ornamental supporting role to the leaves, taking center stage once the defoliated trees go dormant. We link to vendors to help you find relevant products. If you buy from one of our links, we may earn a commission. - Source: Internet
• Some signs include yellowing and wilted leaves on one side of the maple tree, defoliation and stunted leaf growth, and the discolored wood under the bark. Some of the key causes behind the same include soil-based fungus. When it comes to treatment, there is no cure; however, a few can recover with effective care. However, you must get rid of the tree and fumigate the soil in severe cases. You can plant a wilt-resistant plant in the same place. - Source: Internet
• The most common – and least important – problems can be seen on the leaves. There are a variety of leaf diseases found in maple trees that vary in intensity from year to year and from place to place. These usually show up as different kinds of spots on the leaves. They are usually seen in mid to late summer and none of these diseases are life-threatening. The most common are listed below: - Source: Internet
• High soil alkalinity and nutrient deficiencies in the tree can be corrected by adjusting the soil pH and soil enrichment with organic material. The ideal soil pH range for maple trees is between 5.5 and 7.3. It can be lowered by using organic mulch, which coincidentally, will provide nutrients to your tree. - Source: Internet
• Last month, I received an email message from a Lucas County resident that was noticing leaf drop on some maples in her neighborhood. Of course, the diagnostic process immediately begins, and my mind automatically goes to the OSU FactSheet, and I start going through the series of questions. If you aren’t familiar with the FactSheet, or need a refresher, this resource is laid out in a order that takes you through the diagnostic process. - Source: Internet
• There is no treatment option for this ailment; all you need is proper prevention that helps clear away the infected leaves that seem to have fallen on the ground. It also reduces the chance of maple spider mites and the bugs like box elder that multiply the leaf litter. The ailment is more reported during the late summer or the fall season. The risk level for the ailment is low, and it is not very life-threatening to the maple trees as it only hampers their appearance. - Source: Internet
• If you find any cosmetic imperfections, including leaf discoloration and bark growth, you do not need any professional help. However, if your maple contract a disease like a root rot, verticillium wilt, snap streak, or root rot, DIY is not recommended for these issues. Better call a pro as they have the expertise to fix the problem. - Source: Internet
• Although these leaf diseases can be unsightly and cause trees to lose a lot of leaves during the summer, they are very rarely harmful and next spring the trees will grow normally, with lots of fresh, healthy leaves. Trees that are well-watered, fertilized and cared for with usually develop fewer leaf diseases. If you have a severe outbreak, make sure you rake up the leaves and destroy them, as these diseases go through the winter on old leaves and then re-infect the trees next summer. Sprays and chemicals are rarely needed, as your tree will normally never be seriously harmed by these diseases. - Source: Internet

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