Aspen tree disease pictures

Tulip Tree Disease

The tulip tree is also known as the yellow-poplar, tulip-poplar, white-poplar and whitewood, and is a member of the magnolia family. Tulip trees require a long time commitment. They can live to be about 300 years old. The tree grows in the eastern United States, from the southern part of New England, west through Michigan and southern Ontario in Canada, then south to Louisiana then back east to the north central part of Florida.


Tulip trees are susceptible to fungal diseases, some of them fatal in most cases. Armillaria root rot is also known as oak root fungus or shoestring disease. Verticillium wilt is a fungal disease that attacks the vascular system of the tree. Powdery mildew is a fungal disease that is common with many different plants.


The first symptoms of Armillaria root rot appear as leaves that are smaller than usual, discolored and drooping. Mushrooms might be seen growing from the base of the tree. Verticillium wilt appears as leaves that turn to a faded green, yellow or brown. Peel back the bark on the infected areas and there will be dark stains that run along the grain of the wood. Powdery mildew appears as a white, powdery growth of fungal spores on the leaves, flowers, fruits and shoots and it can be on both or either old and new growth.


Armillaria root rot will strike when the soil is too moist. The infection enters when the roots come in contact with the roots of other infected plants. Verticillium wilt occurs when the plant does not get proper irrigation and fertilization. Powdery mildew thrives in shady areas when the temperatures are on the moderate side.


For Armillaria root rot, make sure there are no roots from old trees in the site and let the air dry out the soil before planting. For Verticillium wilt, inspect the trees on a regular basis and remove any that are infected. Powdery mildew can be controlled planting in sunny areas and not over fertilizing. Watering can help by washing the spores off the tree and landing in water will kill them.


Armillaria root rot kills a layer of cells in the stems that is responsible for the growth of new tissue. Armillaria root rot can be fatal. Verticillium wilt can be fatal. The shoot and branches will wilt and die off, usually starting on only one side of the tree. If the tree does survive, it might still experience branch dieback. These branches need to be pruned off. Powdery mildew will cause the infected leaves to drop off early in the season.

10 Common Diseases in Aspen Trees and How to Treat Them

The domestic plantation of aspen trees has increased in recent times. The aspen tree is afflicted by many diseases, though not all are fatally harmful. This post lists a few common aspen tree diseases, and ways how to treat them.

Did You Know?

Aspen trees have mythological significance. The tree’s name in Greek, ‘Aspis’, means ‘shield‘. It is also used as a symbol of Christmas holidays in many parts of the world.

Aspen trees were not the most preferred trees for home decoration in the past. There has however been a change in this trend in recent times, as more and more people now plant aspen trees as part of their home decoration. These trees are fast growing and the leaves develop a beautiful color in autumn.

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Aspen leaves are short and have a flat stem. Even the slightest of breeze is sufficient to ruffle them around. This has led to the tree being famously known as the quaking aspen. The scientific name of the tree, Populus Tremuloides, has made is famous as the trembling aspen.

Aspen in Plant Kingdom
Kingdom Plantae
Order Malpighiales
Family Salicaceae
Genus Populus
Section Populus
Species Populus Tremuloides

Aspen Tree Diseases


Aphids are also known as plant lice. These are small insects and affect the stem, trunk, and developing leaves. Aphids feed on the plant sap. It is the fluid that carries sugar and other nutrients that are required for plant growth. The growth of the plant is affected when the aphids remove their sap.

Ants are attracted to the honeydew that the aphids secrete. Their presence on the aspen tree is more often than not a sign of aphids infecting the tree. Decreased growth can be a symptom of aphids feeding on the plant sap. The leaves of aphid-infested trees turn yellow and are curled. The presence of sooty mold fungus can also be a sign of aphid infection.

You can use neem oil, oil from the Indian Lilac, as an organic pesticide to get rid of an aphid infestation. This interferes with the mating habits of the aphids and controls the overall population. There may be a need to use this treatment more than once. You can also facilitate aphid predators like ladybugs and lacewings an access to the infested plant. This will reduce the aphid population drastically.

Marssonina Blight

This is a fungal disease caused by marssonina brunnea and marssonina populi. This disease is dependent on weather conditions, and its severity differs each year.

Marssonina blight, at the beginning, leads to the formation of small, brown spots on the leaves. These spots enlarge with the progression of the disease. The spots may be vein-limited. This disease may lead to the defoliation of the aspen tree.

Sever the affected part of the tree. Make use of fungicide as a preventive measure before the outbreak of the disease. Keep sufficient distance between two trees so as to allow air circulation and restrict the spread of the disease. Also, do not allow moisture to gather on the surface of the leaves. A variety of aspen trees that is resistant to this fungal attack can be planted.

Aspen Leaf Miners

Aspen leaf miners are types of moths. These insects form and grow within the aspen leaves. They feed on the interior tissue of the leaves. It may not be a fatal disease, but the spots caused by the moths ruin the beauty of the leaves of this tree.

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The leaves dry out when they are infested with leaf miners. They may fall off or turn brown in color.

The presence of insects will need spraying of insecticide, However, it will have very little effect in case of large-scale infestation. You can treat the infection by using insecticides that find their way through the root system of the plant.


Cytospora is a fungal disease. This is caused by the cytospora cankers fungus. This fungus is active in hot and humid conditions, and dormant in cold weather conditions. This is a fatal disease.

This fungus infestation may lead to the discoloration of the aspen tree. It may also cause an orange-colored liquid to ooze from it. This is a result of the spores of the fungus.

If infected, dispose off the affected area of the tree, and provide proper sanitation. The fungus infestation can be avoided by planting a resistant variety of the tree.

Trunk Rot

A trunk rot in aspen is caused due to Phellinus Tremulae. This is a species of polypore fungus.

One of the primary symptoms of the tree being infected by this fungus is the loss of its volume. Trunk rot causes holes in the aspen tree that are used by birds for nesting. Hence, you will find bird nests in the tree.

Plant the variety of aspen that is resistant to trunk rot. Remove the affected area of the tree, if possible, like in case of various other diseases. There is no specific remedy for this disease, thus giving the preventive measures more importance.

Oystershell Scales

The scales attach themselves to the tree bark or branch. They, like aphids, feed on the sap of the tree, and kill the tree over time. The scales have a brownish color which is very similar to the bark of the tree, and can easily be overlooked.

Upon infestation, there is a formation of folds in the affected limb of the tree. This means that there will be irregular curves or bends in it. The oystershell scales can be easy to overlook, but not the injury that they inflict on the tree.

Oystershell scale infestation can be brought under control with the help of wasps that feed on them. If the infested area is small, then that portion of the tree can be scrubbed to get rid of the infestation. Insecticides can also be used to bring the infestation under control.

Ink Spot Disease

Ink spot disease is caused by a fungus named ciborinia. It can damage the growth of the tree.

As a result of infection by this fungus, brown spots start appearing on the leaves of the tree. The spots are similar to the spots caused by leaf miners. These spots fall off and leave a hole in the leaves.

In case of this disease, fungicides are effective only for prevention purposes. Proper distance between trees can limit the damage caused by this infestation. Cut off the infected leaves before the problem spreads.

Sooty Bark Canker

Sooty bark canker is a fungal disease. This is caused by encoelia pruinosa. This disease is fatal for aspen trees.

There may appear a dead patch on the bark that grows with time. The infected bark becomes ‘sooty. The bark then starts to wither.

Remove the limb that is infected with the disease. Make use of copper fungicides. Also paint the tree exposed to direct sunlight to prevent sunburn. When painting the tree, use white latex paint.

Black Canker

Like sooty bark canker, black canker is also a fungal disease. This is caused by ceratocystis fimbriata. This disease has a very slow progression, and is not fatal for the aspen trees.

The symptoms of this disease are similar to sooty bark canker disease. There is appearance of a small dead spot on the tree, that, after years of infestation results in a huge canker. Spores appear at the infected area which are difficult to see. These spores ooze out as a sticky mass.

No major control measures are known against black canker. Avoid any wounding of the tree in its growth years. If removing the infected area is the only option, then leave the infection untreated, as this disease is not fatal.

Elk Scarring

Elks scar aspen trees and wound them. This opens up the risk of the tree being host to a range of harmful diseases.

The tree is susceptible to infection. Also, there will be wound marks present towards the base of the tree.

Use chemical deterrents or repellents to avoid elks from browsing on the tree surface. Fencing can also be an effective way to manage and limit the damage caused by elks.

Marssonina Blight and Ink Spot Disease are fungal infestations and result in a ‘black leaf’ problem in aspen trees. The roots of a towering aspen are very invasive. So take care not to plant these trees too close to your home.

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Black Leaf Fungi is out competed by BioVam Mycorrhiza Application

These first three pictures illustrate how the fungus had been stopped by the effects of BioVam Mycorrhiza applied to the roots of these plants. The health of the plant was raised even in the stress of fall and the fungus was halted.

All the leaves had dropped from this tree except for one branch that was green with green leaves on it. This is a good illustration how plants inoculated with BioVam Mycorrhiza resist environmental stresses… like the cold weather of fall. The tree did go dormant, but it took a little longer

Customer Feedback

I think its wonderful hearing about all of the positive reports from your product.
All I can say is that I applied the product with your fertilizer when I planted 2 quaking Aspen trees. I am nearly certain being in Tennessee and with the drought we are having the leaves would have burned up and fallen off, but they appear to be holding their own with the addition of supplemental water.
The conditions we are having down here have been brutally hot and dry. I guess its too soon to say (about 6-7 weeks) but they are NOT losing their leaves and new stems are growing!!!
In the same area I applied Mycorrhiza to an established Yos Weeping Cherry tree that the previous owner had planted last year. It looked in sad shape when we bought the house back in the first part of July…but now it’s greener and growing pretty good…no fungus or insect problems noticed.
I also applied your product to two Bigtooth Aspen trees I had in pots. When I planted them they went thru a period of pretty bad transplant shock but are starting to look healthier. These were trees planted in direct sunlight with temps over the weeks hovering from 95 to 100 degrees.
I plan to order some Big Sage Brush (Artemesia). Could you confirm that your product would work on them. I’ll keep you posted how my future plantings go. Just thought you would like to know.
P.S.: I was pretty conservative with the amounts of Mycorrhiza I used. Could you tell me if another application might bring better results? (You know a little does a little good so a lot would do even better?) Take care and I’ll keep you posted. –M.D. Cleveland, TN.

Benefits to established, mature plants and trees.

The above trees are six years old. Some of the experts would scoff at applying Mycorrhiza to trees of that age. They would typically say, “The natural Mycorrhiza present would be dominant and adding more Mycorrhiza would have little effect.” If that were true, then we would not be witnessing the responsiveness of these Quaking Aspen to the BioVam Mycorrhiza inoculant that was added to their root systems.

We have applied Mycorrhiza to existing Rose plants and have noticed the same results as what were achieved with the Quaking Aspen above (.) The fungus on the leaves of those Rose plants did not spread to other leaves after the Mycorrhiza was applied.

There is a tendency of growers to say, “But my (fill in the name) trees are not Quaking Aspen or Roses!” Our response based upon our observations is this: With Mycorrhiza, the same principles apply to all of the plants that benefit from Mycorrhiza – if you raise the vitality of a plant, it may become resistant to diseases such as leaf fungi.

Traditional agriculture says, “Spray the tree with a fungicide.” People have heard only that for years. With Mycorrhiza we say, “Raise the level of the plant’s vitality and the tree will resist the fungi.”

This picture, taken 9/6/1999, shows a Quaking Aspen with nice golden leaves. We treated the turf grass with BioVam Mycorrhiza and the Mycorrhiza vectored into the roots of this tree.
The customer remarked that they didn’t realize Quaking Aspen had such beautiful fall colors. They thought the leaves turned black and then fell to the ground. The vitality of this tree was significantly increased and it was able to resist the black leaf fungi intrusion so that the golden leaves were displayed in the fall of 1999.

Leaf Diseases: Anthracnose, Aspen Leaf Disease, and Coryneum (Shothole) Blight

Spring is around the corner, and tree buds are breaking. Now is the time to be aware of three different leaf diseases that can invade your trees. Know what the diseases look like and how to treat them.


Anthracnose is a fungal disease that occurs in Utah on ash, dogwood, maple, oak, and sycamore trees. The fungi cause brown and tan lesions on leaves usually along the main veins. As the disease worsens the lesions grow to take up large portions of the leaves.

Tree branches can also become infected. The disease looks like black spots on the bark. As anthracnose gets worse, bark on the branches will start to split.

Anthracnose on Ash Tree Virginia Tech Learning Resources Center, Virginia Polytechnic Institute and State University,

Anthracnose on Dogwood Tree Tree Robert L. Anderson, USDA Forest Service,

Anthracnose on Japanese Maple Tree Bruce Watt, University of Maine,

Anthracnose on Oak Tree Joseph OBrien, USDA Forest Service,

Anthracnose on Sycamore Tree Ward Upham, Kansas State University,

Aspen leaf spot is quite common in aspens and other poplar tree varieties. Looking like brown spots with yellow rings, the disease grows on leaves. If left untreated, the lesions will grow and eventually deteriorate, leaving holes. Because the tree is under stress due to the disease, it can be susceptible to Aspen borer, iron chlorosis, or other related issues.

Aspen Leaf Spot on Aspen Tree

Coryneum blight is a fungal disease found in ornamental (flowering) and stone fruit trees, especially apricot, nectarine, and peach trees. The infection can affect branches, buds, fruit, and leaves. The disease first appears as purple or brown small, circular spots on leaves. As the summer progresses the spots fall out leaving small round holes within the leaf margins. The round holes have led to the disease being called another name: shothole blight.

On fruit the fungus also causes brown and purple spots that will turn to white and gray lesions. The lesions then crack and the fruits bleed. If left untreated, the disease can cause loss of fruit overtime.

Purple-red spots can appear on twigs and branches. Infected buds will die and will have a dark, sunken circle around the bud on the branch or twig.

Coryneum Blight on Peaches H.J. Larsen,

Coryneum Blight on Cherry Tree Elizabeth Bush, Virginia Polytechnic Institute and State University,


One way to treat the disease is to prune the sections of the tree that are infected with the diseases. Sanitize the pruning tool with alcohol or bleach in between each cut to ensure the disease doesn’t spread.

Stewarts offers a fungi control for trees. We spray trees in the spring after the buds have broken and before the leaves are fully grown. The disease control will treat the trees and prevent the leaf diseases from spreading.

For an estimate, call or text us at 801-226-2261.


Watch our three videos about common sycamore tree leaf problems

Sycamore anthracnose:

Sycamore plant bug:

Sycamore scale:


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