Here is a message and 2 photos from a friend who wonders what is damaging some of the leaves on her young Japanese maple. Do you think this is an insect problem or just cultural damage? "Leaves at the ends of branches look “chewed”. At first I thought they had been battered by the recent high winds, being only the newest leaves at the ends. Now I’m wondering if an insect is involved. Otherwise, there’s new growth coming along."