Hi there. New to the site. I have a ton of question on trees. Bought my first house about a year ago and have like 9 trees (7 of them 25+ other two are apple.. one red one yellow. anyhow i will try to get one problem solved but will probably be posting a lot. anyhow the apple tree are about 15 years old... never been pruned (none of them have ever been according to neighbor) When we moved in the apples were incredibly good, last summer they were really bad. I want to prune them but never was sure when or what exactly to prune. Lot of dead branches etc. I'm not looking for aesthetics considering i think they are too far gone for that... but even if they weren't i'd rather the fruit. I just didnt want to stress the trees out but reading some of these other post it looks like stressing them is a good thing??? I live in PA, temp here has been high 50s during the day and high 30s at night.. not sure if that helps. here are some pictures of the two trees. Any help would be greatly appreciated.