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I have a mature elm in my backyard that was probably planted when the house was built in the 70's. We bought it 3 years ago and I have noticed that something is eating away at the bark. There is a reddish-brown streak (almost like what you would see in a human that has blood poisoning) that runs up the bark. I cut off one of the lower limbs that the problem had progressed to. The bark is very "mushy" and looks decayed. Chunks of bark fall off at the affected areas. I cannot see any bugs that may be causing this but I suspect that is the cause. This tree has 2 main branches that extend from the bottom and this is where the main damage seems to be. I am concerned that the tree could "split" at this point if it becomes weakened. I need to know the cause and treatment.
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