Why Is My Tree's Trunk Turning Black? Possible Diseases (2024)

Taking care of trees comes with a fair share of responsibility. This includes inspecting the trees every so often for signs of deteriorating health. If you’ve ever asked yourself the question, “Why is my tree trunk turning black?” keep reading for more insights into the issue.

In this post, we delve deeper into the reasons tree trunks turn black, as outlined by the besttree removal service in Girard, OH.

What Causes Trunk Blackening?

Tree trunks turn black for various reasons. The most common culprit? Tree diseases from fungi attacks, bacterial infections, and insect infestation. Your tree’s trunk may also turn black as a natural response to stress, like improper pruning.

Common diseases that could cause your tree trunk to turn black include:

    • Verticillium wilt
    • Bacterial wetwood
    • Sooty mold
    • Black knot
    • Bacterial cankers
    • Fire blight
    • Gloomy scale

Pinpointing the disease your tree has depends on factors such as the symptoms and tree species.

Fungal Infection

Trees develop fungal infections primarily because of poor soil drainage, excess water, and high humidity levels.

Verticillium dahlias, for example, the fungus responsible for causing Verticillium wilt, affects the vessels that carry water throughout the tree. This influences water and nutrient uptake, eventually turning the trunk black. This can also result in tree leaves curling up.

Bacterial Diseases

Poor hygiene around trees creates the perfect breeding ground for bacteria that eventually attack trees, causing barks to turn black. One such disease caused by erwina amylovora bacteria is fire blight.

Another common tree disease, bacterial wetwood, makes trees appear black as well. Trees affected by bacterial wetwood ooze a black liquid that covers the whole bark, giving the impression that the bark has turned black.

Stress

Did you know that trees succumb to stress? When asking yourself the question, “Why is my tree trunk turning black?” you probably never thought about stress as a possible reason for the tree trunk turning black.

A stressed tree may develop black patches on the bark, say, after a storm’s impact, which could eventually lead to a dead tree top if the stress is severe enough. Improper pruning or cutting the tree bark may also cause the black bark response.

Insect Attack

If you notice your tree trunk turning black, insectsmay be to blame for your woes. Insects you want to look out for include:

    • Bark beetles
    • Carpenter ants
    • Ambrosia beetle

How to Deal With Black Bark on Trees?

The best way to address a tree trunk turning black will depend on factors like the tree species, type of disease, and the level of disease. Following appropriate tree-growing practices goes a long way toward keeping your trees healthy and avoiding health issues.

Some remedies to consider when you notice your tree trunk turning black include:

    • Prune off infected parts
    • Apply bactericide and fungicide
    • Use insecticides
    • Keep your garden clean

When to Call a Professional

The earlier you deal withstructural defectsor symptoms of declining tree health, the better. Proper care and maintenance will save you from spending plenty on an issue you could have avoided.

However, don’t hesitate to seek professional help as soon as you notice an issue with your tree. Prompt action could be the difference between saving your tree and having to cut it down.

Contact Your Local Tree Experts

If you need professional tree care delivered by local experts, look to Starwood Tree Service to evaluate your needs effectively and provide exceptional tree services. We proudly serve residential and commercial property owners as well as forest landowners across the Greater Girard, OH, area.

Our full range of services includes:

    • Tree removal
    • Tree trimming and pruning
    • Stump grinding
    • Land clearing

Contact us at (330) 231-5022 for more answers to the question” Why is my tree trunk turning black?” or to learn abouttree-cutting mistakesyou want to avoid.

Why Is My Tree's Trunk Turning Black? Possible Diseases (2024)

FAQs

Why Is My Tree's Trunk Turning Black? Possible Diseases? ›

Tree trunks turn black for various reasons. The most common culprit? Tree diseases from fungi attacks, bacterial infections, and insect infestation. Your tree's trunk may also turn black as a natural response to stress, like improper pruning.

What is the black disease on tree trunks? ›

Black knot is a common fungal disease of Prunus trees including ornamental, edible, and native plum and cherry trees. Hard swollen black galls (tumor like growths) form on branches and occasionally on trunks. Many Prunus trees tolerate black knot.

How do I get rid of black fungus on my tree trunk? ›

Another effective way to prevent or get rid of black fungus is by using a fungicide. Before fungicide can be applied, you have to remove existing black knots. Also, fungicide is best applied in dry weather when the temperature is above 60 degrees Fahrenheit.

Why is the trunk of my tree turning black? ›

Tree trunks typically turn black when the tree has a disease or an insect infestation. Identifying the exact disease or infestation will depend on the tree's species and its symptoms. For instance, Steganosporium Ovatum is a fungal infection that can affect the tree.

What does an unhealthy tree trunk look like? ›

Peeling or loose bark or cracks in the tree around the tree's root collar. Swelling, soft or decaying wood, or small holes in the tree trunk. Dead, dying, or drooping branches in the canopy.

Can a tree survive black knot disease? ›

Black Knot Fungus is spread by wind or splashing water drops. Once started, galls slowly expand and may eventually girdle and kill infected branches. As the swellings grow, they'll cover just one side of the branch. Infected trees usually survive but are less attractive and produce far less fruit.

What does black rot look like on trees? ›

Disease symptoms

They appear as reddish-brown sunken areas with rough, cracked bark. The old cankers are dry and appear blistered, peeling and revealing black pimple-like, spore-carrying structures (Figure 1). Leaf lesions start as very small purple spots.

Will tree fungus go away on its own? ›

If you don't treat the fungus in your trees, the tree can become irreparably injured and die, or can spread the fungus to neighboring trees. Take the essential steps to heal your trees, and once your trees are on the mend, make sure you are taking care of them so that they can flourish and thrive.

How do you treat sooty bark disease? ›

Remove trees in the winter or during humid weather to limit spore dispersal. Remove trees that are dead or decaying to mitigate safety risks associated with limb or whole-tree failure. High-value trees that are severely infected may be conserved by pruning the affected branches and cutting off trunk cankers.

Can a tree with fungus be saved? ›

You can never “cure” a tree of fungus, but you can get the fungus to go “into remission” where your tree returns to health and vigor.

Can you save a tree with trunk rot? ›

If you don't eliminate the culprit of the wood decay, even the most diligent of care won't do much to save your specimen. We recommend consulting with an expert and having them diagnose the problem, so you can take the necessary steps to rectify it.

Can diseased trees be saved? ›

Tree Disease Diagnosis and Management

Once a disease is identified, arborists can prescribe the appropriate treatment. This may involve pruning away infected branches, applying fungicides or antibiotics, or implementing cultural practices like adjusting watering or mulching to mitigate disease progression.

How do I know if my tree trunk is diseased? ›

One of the most easy-to-identify signs of tree disease is tree bark changes. If you notice tree bark fungus growing on your tree with white or black spots on the tree bark, these are clear signs that your tree should be examined by a professional.

What is tree trunk syndrome? ›

Tree man syndrome is a colloquial term for epidermodysplasia verruciformis (EV). This is an extremely rare skin condition that can cause bark-like growths. While the exact prevalence of EV is unclear, there have been more than 200 reported cases, the Genetic and Rare Diseases Information Center (GARD) note.

What does trunk rot look like? ›

It'll manifest in the tree's trunk having a bulge as it begins to buckle under its weight. Wood that's beginning to decay with white-rot will look wet, spongy, and fibrous. It'll also appear white or yellow due to the loss of lignin.

What is the black stuff coming out of my tree trunk? ›

That “black stuff” is the result of a bacterial infection called Wetwood or Slime Flux.

What kills black knot fungus? ›

The fungicide recommended for managing black knot on ornamental plantings is thiophanate-methyl (Cleary's 3336) when dormant and at pink bud, full bloom, and three (3) weeks later. Follow label directions on the fungicide package. For trees used for fruit production, apply captan.

How to treat black bark on a tree? ›

Some remedies to consider when you notice your tree trunk turning black include:
  1. Prune off infected parts.
  2. Apply bactericide and fungicide.
  3. Use insecticides.
  4. Keep your garden clean.
May 27, 2023

What causes sooty bark disease? ›

Sooty bark disease is an infection caused by a fungus (Cryptostroma corticale) that attacks maple trees in British Columbia (BC) – key host species include sycamore maple (Acer pseudoplatanus), Norway maple (A. platanoides), and bigleaf maple (A. macrophyllum).

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