Sick tree treatment can be used as a preventative for a lot of things, possibly including this. Personally if it were a problem in my area I'd be foliar-spraying the trees weekly with garlic/pepper tea to discourage anything from even taking an exploratory nibble.
_________________ Shepherd of the Trees
It is not our part to master all the tides of the world, but to do what is in us for the succor of those years wherein we are set, uprooting the evil in the fields we know so that those who live after may have clean earth to till.
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