That looks like a stink bug but I have never seen a black one.
That looks like a mite of some sort and they are DIFFICULT to get rid off. You said they were in the "small folds". Do you mean in the bark or somewhere else on the tree. Most mites, depending on where they are, are most times fought with some type of oil, usually either Neem Oil or horticultural oil, but the tree must be dormant. We need to know exactly where these bugs are located. Also, a better-focused picture would help.
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