Where do you live? Chill hours make a difference; soil makes a difference; precipitation, whether directly from rain or indirectly from snowmelt, makes a difference.
What exposure to the sun do the trees have? All day? North, south, east, west?
Some fruits are borne on new growth; that's why pruning is essential. Some fruits grow on second-year wood; that's why knowing what and how much to prune is essential.
How long have you lived in this house with these trees?
Etc. Please put your location (e.g., northeastern Wyoming, central Tennessee) in your profile. It will help everyone help you.
Sunset Zone 17, USDA Zone 9