So, I went out during lunch today to do my usual walkthrough, and the two new asian pears I put in earlier in the spring are just covered in beetles. Can't really get too close without being covered. These things are also pretty heavy on a couple plum trees, and on some of my peaches, but not all, and in much less numbers. There's also a couple of fence posts (PT wood, new) that are absolutely covered, so they're clearly not that picky.
What are they? Do I need to spray something? If so, what? (picture is of one of the plums... did my best with my phone)