I just found these same beetles on a late ripening peach tree. These things
are huge, like japanese beetles on steroids and they're aggressive too. I had to
fight one off with a glove. They remind me of june bugs, but as I said, very aggressive,
and it's far too late for june bugs. I normally let my peaches ripen on the tree, but I
picked two buckets from this tree this morning, that weren't fully ripe, just to save them from
these pests. They only attacked this one tree, and left the others alone.
I would normally spray an insecticide for them, but it's too close to harvest, and it would
make the fruit unsafe to eat. So Suzie, I highly recommend that you don't spray ANY insecticide.
I'd try a water hose with a strong pressure stream. They don't like water, but I'd wear some
protective clothing. As I said, they're aggressive.