closeup of a birch leafminer caterpillar next to damaged edges

birch blister blotches branch brown bug caterpillar closeup damage destroy detail disease dry eating edge fecal fenusa fly foliage forest frazz hollow inner insect larvae layers leaf leafminer management miner nemoratu parasite parasitoids pathogenic pest pocket poop profenusa pusilla rattle sawfly seperate sound systemic tree wasps worm