maple dieback

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ATH

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Silver maple with dieback in a few limbs.

There was some construction around this tree (new driveway within 10' of one side). There was a fair amount of heavy traffic over the root zone. I did some radial trenching and deep core aeration this week to help alleviate that.

However, I found unknown cankers on the dying twigs. These are spots that do not go around the twig. They are subtle from the outside, but when the bark is peeled away, they are leaving a decent area of dead. Neither raised or sunken. The 3 close-ups are all the same spot.
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Got some of those same looking spots on a sugar maple I cut down last week, when we first saw them we thought it was a fungus. Could those spots be some sort of dead sap conglomerate? The tree we cut down just died last year from ant infestation.
 
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