I'm not familiar with apple, but all the lumber I've sawn was best when the fresh cut ends were sealed immediately after felling. (I use Anchor Seal). Then the saw logs should be cut into lumber as soon as possible. Do not attempt to dry a log in the round! That's a sure way to get firewood! Stack and weight down the lumber off the ground on a level rack with stickers every 18". Keep a rain and sun cover over it while drying. Let the stack have air circulation.
Regards, The Kentucky Toolsmith!
Regards, The Kentucky Toolsmith!