Answer: You seem to have many issues with your many fruit trees so I think the best advice I can give is to direct you to the Ohio State University website:
This site provides several publications on various tree fruits. I think if you read the publications you can determine just what is going on with each your trees. There is also helpful information about preventative sprays, pruning and fruit thinning.
I think these publications will answer all your questions and guide you in the right direction. Best wishes with your fruit trees!
Q&A Library Searching Tips