Answer: I think there's more going on than meets the eye. Generally, maple bladder gall, caused by mites, doesn't usually make a noticeable difference in tree growth and performance - certainly not enough to kill whole branches. Did the dead branches have gashes, cankers, or evidence of fungus? Perhaps your extension agent or a good local arborist can examine the tree and help you decide to replace or salvage your maple. Good luck!
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