Hi.  I live in northeast Oregon.  I moved into my mother's house and 2 years ago and inherited a backyard apple tree.  I do not know what kind of apple tree this is.  When my mom moved in 5 or 6 years ago, the apple tree was already there.  She never did anything with the apple tree, but when I moved in with her, I read up on taking care of apple trees and the first fall I was here, I trimmed all the dead branches off the tree, around October or so.  I literally took off about 1/8 of the tree.  Last year, after the intense pruning I did, the apple tree produced nothing but leaves.  I think there were 3 apples on the whole tree.  This year, it filled out with hundreds of buds and now is covered in apples.  The branches are so heavy, some are only 2 feet from the ground now.  I even thinned some of the apples where I could reach them.  I keep the ones picked up off the ground daily.  I am unsure now of what, when or if to spray the tree.  We did plant 2 cherry trees in line with our apple tree this spring.  Some of the apples have worm holes in them and I have read up on what I can find on the internet about this, but am no closer to figuring out what kind of insect this is or how to properly care for the tree.  I would appreciate any advice or guidance.  Thanks - Ellen E.