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.
Eevee only requires 2 Hearts in the Affection Meter to evolve into Sylveon. Sadly, if Eevee was not caught at level 19 (when it still knows Baby-Doll Eyes), and if the trainer does not teach it Charm at level 29, it cannot evolve into Sylveon, because Eevee cannot learn any other fairy-type moves, not even through TM.