There are many types of fungi that can grow on trees and not all are harmful. Some are beneficial to trees, while others are just harmless. However, some types of fungi are very harmful to trees, as they are pathogenic and can either feed directly on them or cause internal decay that weakens them. So, how do you know if the fungus growing on your tree is harmless or harmful? Although it’s tricky to spot and you should call in arborist services for tree assessment, here are some ways to determine if fungus on a tree is good or bad.
Is The Fungus On My Tree Good Or Bad?
Signs Of Beneficial Or Harmless Tree Fungus
There can be beneficial or harmless fungi that may not be concerning. So, let’s address signs of these good fungi:
- Fungi growing on branches that are already dead.
- Lichens appear on the trunk, forming a green-like film on the branches or the trunk.
- Moss growth with fungi in moist areas.
- Mushroom growth after rain for a few days only.
- Healthy and solid bark that shows no signs of decay in spite of fungal growth.
Signs Of Harmful Tree Fungus
Even though not all fungus types are harmful, the bad ones can inflict serious damage and decay to the point that the tree becomes weak and falls. Depending on the type of harmful fungi, they can feed on the inner wood, the outer wood, or the roots. It leads to decay in any case. Below are some signs of bad tree fungi.
Mushrooms Growing On The Trunk Or At The Base Of The Tree
This is one of the most alarming signs of harmful fungi because mushrooms and conks on living trees’ trunks or roots are a sign that fungal decay has been occurring for months or years, and the tree is already weakening and decaying, and it should be considered hazardous.
It’s a problem because mushrooms are fruiting bodies of fungi and they don’t appear until the fungi has caused significant decay. So, if you see mushrooms growing from a living tree trunk or at the base of visible parts of the roots or at the very base of the trunk, consult a tree expert ASAP.
The Wood Near The Fungal Growth Area Is Soft And Spongy
Healthy trees have solid and hard wood, especially the trunk and bigger branches are solid. So, if any part of the tree trunk or large branches feels spongy and soft, it’s a sign of wood decay.
To perform a test, you can use a rubber mallet and tap the hardwood. You can also use your finger to knock on the wood after wearing gloves. Upon tapping, apart from being wood spongy, you won’t hear the clear wood sound. The tapping would make a hollow sound. This indicates the internal wood is decaying due to fungi (or any other problem).
Cavities In The Trunk
This is not a clear sign because some trees have hollow trunks naturally. In fact, they act as a habitat for birds and other living things. However, if your tree species doesn’t have a hollow trunk, you should be alarmed if there is a cavity in the trunk.
A hole or cavity in the trunk can have various causes. It can be due to external damage, such as improper pruning, a disease, storm damage, animal damage, old age, etc. Moreover, a hole in the trunk can also form due to fungi eating away the internal wood, creating a hole or holes in the trunk. An unnatural cavity can act as a gateway for other harmful insects and diseases to invade the tree and weaken it. Usually, woodborers and woodpeckers enter the tree hole very soon after its development, followed by other pests.
That said, fungi can invade a tree through a cavity as well. For example, if a hole is formed in the tree trunk because of animal damage, harmful fungi will have an opening to enter the tree and feed on it, similar to other harmful insects and diseases. Air and moisture keep the internals damp, which helps fungi and other invaders.
Therefore, if your tree trunk has a cavity or cavities that are getting bigger, and you’re also noticing other signs, like mushrooms on the trunk or at the base of the tree, the tree may be decaying. Hire tree cutting services Kensington to remove the tree before it falls unexpectedly.
Cankers (Dead Bark Patches)
Cankers are localized dead patches on a tree trunk. They can look like sunken, flattened, or discolored patches on the trunk or a combination of these. They can sometimes look like tree cavities, though, both are different problems.
Tree cavities are the hollowing of the trunk due to damaged internal wood (heartwood), whereas cankers are damaged patches on the trunk that are limited to the outer wood (sap wood). However, similar to tree cavities, cankers can be the cause or the sign of fungal infestation.
Oozing Sap
Trees have sap that moves through their systems and due to that, a limited sap on the trunk is not harmful. However, if the sap is oozing from the trunk, it hints at an injury, disease, or fungal infestation. Clear oozing sap is not concerning, but if it has any other color, you should inspect the tree. Call a professional service for tree care.
Branch Dieback
Branch dieback is a condition in trees that means the death of tree branches. The process initiates from the tips of the branches. It begins with undeveloped leaves and then they stop emerging over time. As the damage progresses, the entire branch weakens and eventually falls off. This is a slow process, so if you’re seeing a weakening branch, the cause of the problem has been there for months or years. One of the causes of dieback is fungal infestation.
To ensure its fungal dieback, you can check by cutting a small section of the branch. There will be discoloration instead of the regular white color. Plus, look for mushrooms and shelf fungi on the trunk or dead wood.
Root Problems
Fungi, like Armillaria, Ganoderma, Heterobasidion annosum, and others, can attack the roots of trees and create massive problems. It’s because roots are vital for trees to get nutrients, so when they are affected, the tree can die.
Root problems caused by fungi can lead to premature fall color, wilting, thinning canopy, dieback, stunted growth, and other above-ground issues. You may also see mushrooms or conks on the trunk or on the root flares. Moreover, the roots will be soft and mushy, and will be discolored and look black, brown, or reddish-brown.
Thinning Canopy
The canopy is the upper part of the tree. If that is thinning, or leaves are yellowing or not growing, or branches are falling off, an inspection is due. This decay can be due to fungal infestation or any other problem.
Conclusion
Fungi on trees can be beneficial, harmless, or harmful. So, learning the difference between them is critical so you can spot harmful fungi quickly and contact tree removal services Chevy Chase on time.