Q.apples
almost all of the apples on my three year old apple tree have little holes in them, and when I cut them in half there are small brown holes going to the core. any idea why?

These links will help you with pest control on your Apple Trees.
https://www.gardeningknowhow.com/edible/fruits/fegen/fruit-tree-spraying.htm
https://www.gardeningknowhow.com/edible/fruits/apples/pests-affecting-apples.htm
https://www.gardeningknowhow.com/edible/fruits/apples/apple-maggots.htm