What can you use to get rid of the bugs that eat thee leaves on an elm tree?

Well I'm no expert but you could use chemicals, but sometimes those end up killing the tree along with the bugs. But you could get some kind of bird, a chicken, parot, or any pet that won't fly away. I would use a chicken because I own chickens and there have been a lot less bugs around since I got them. But you might want to use a pet bird because chickens aren't the cleanest birds in the world. Yes, definatlly a pet bird, just make sure that your bird is very close to you and won't fly away if it is out of it's cage. I don't want to be tracked down and sued for telling you to let your bird out of its cage, ok?