caterpillar

caterpillar

Observation - caterpillar. Description: Found this in a curled up leaf on small apple tree in my garden and am worried in case it is a bad sign. Any idea what it is (and whether a pest or not)? I replaced it in another bush until I was sure it was not a pest.

Found this in a curled up leaf on small apple tree in my garden and am worried in case it is a bad sign. Any idea what it is (and whether a pest or not)?
I replaced it in another bush until I was sure it was not a pest.