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There are many kinds of maple tree diseases, but the ones that people are most commonly concerned with affect the trunk and bark of maple trees. Nectria cinnabarina canker – This maple tree disease can be identified by its pink and black cankers on the bark and typically affects parts of the trunk that were weak or dead. Nectria galligena canker – This maple bark disease will attack the tree while it is dormant and will kill healthy bark. Eutypella canker – The cankers of this maple tree fungus looks similar to Nectria galligena canker but the layers on the canker will normally be thicker and will not peel away from the tree trunk easily. Valsa canker – This disease of maple trunks will normally affect only young trees or small branches. Steganosporium canker – This maple tree bark disease will create a brittle, black layer over the bark of the tree. Cryptosporiopsis canker – The cankers from this fungus will affect young trees and starts out as a small elongated canker the looks as though someone pushed some of the bark into the tree. Bleeding canker – This maple tree disease causes the bark to appear wet and is often accompanied by some bark coming away from the maple tree trunk, especially lower down on the trunk of the tree. Basal canker – This maple fungus attacks the base of the tree and rots away the bark and wood beneath.

It is not uncommon for maple trees to develop growths called galls or burls on their trunks.
While not technically a maple tree disease, there are several weather and environment related bark damages that can happen and may look like the tree has a disease.
Sunscald – Sunscald most frequently occurs on young maple trees but can happen on older maple trees that have thin skin. Frost cracks – Similar to sunscald, on the southern side of the tree cracks, sometimes deep cracks will appear in the trunk. Over mulching – Poor mulching practices can cause the bark around the base of the tree to crack and fall off.
This is because bark diseases of maple trees are very visible to a tree’s owner and are often bring about dramatic changes to the tree.
In the spring, the maple tree will regrow a slightly thicker layer of bark over the fungus infected area and then, the following dormant season, the fungus will once again kill back the bark. Also, if the bark is removed from the canker, there will be a layer of visible, light brown mushroom tissue. The cankers of this fungus will look like small shallow depressions on the bark with warts in the center of each and will be white or grey.

This fungus looks very similar to a maple tree root disease called collar rot, but with collar rot, the bark typically does not fall away from the base of the tree. These growths often look like large warts on the side of the maple tree and can get to massive sizes. It will appear as a long discolored or even barkless stretches on the trunk of the maple tree and sometimes the bark will be cracked. Over time, the maple tree will develop a canker that looks like a stack of paper that has been split and peeled back. That being said, these growths do weaken the trunk of the tree and can make the tree more susceptible to falling during wind storms.

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