Codling moth. Codling moth larvae are an important pest of apple trees and to some extent pear trees. The female adult moth lays eggs on apple fruitlets in late spring, and the resulting larvae burrow into the developing apples. They damage the inside of the apple.
Keep on giving it Haircuts and it'll evolve eventually. Eevee can evolve into an Umbreon at and between the levels 2-99. It needs at least 220 Happiness points but from what you said earlier (trusts you), it means that your very close to reaching that level. Makes sure that you level it up so that it evolves. If you don't level it up, then it won't evolve.
Make sure Eevee has a Fairy-type move. Eevee will naturally evolve into Sylveon if certain important conditions are met. The first of these is that the Eevee must know at least one Fairy-type move. You can catch a wild Eevee with Baby-Doll Eyes (Level 19), or use the move tutor to relearn it.