Could it be hurting the growth of leaves on my Acer Beni Schichihenge? There are lots of them crawling up the trunk.
Google vine weevil, se if it looks the same, if it is, you have to kill them all or the grubs will eat all the roots of you plants.
it really doesnt look like a vine weevil at all (not that i am an expert) but it's the wrong shape and colour.... the search goes on!
an overall impression of the tree