For the top picture, you might want to cut off the dead branches and see if the rest of the tree makes it through the year. The white spots in the bottom picture look like a fungal infection (maybe downy mildew)?
Are these trees in a damp area that might foster fungal infections?
Weeds are just plants with enough surplus will to live to withstand normal levels of gardening!--Alexandra Petri
Our cherry trees loose most of their leaves in august here. It takes a couple years for ours to really get rooted. Last year a new one looked like it was completely dead by September. It totally filled out this spring.
The best place to pray for a good crop is at the end of a hoe!