Hi Sheila,

This is great that you had a detailed description with several good pictures. As you have found out, growing fruit trees takes a lot of work!

Fuji and Gala are great eating apples, but they are not disease resistant. Commercial growers in Ohio have to spray them a lot to keep leaves clean and fruits pretty.

I always encourage home gardeners to grow disease resistant apple cultivars so they do not have to spray as much. They still have to spray insecticides and some fungicides.

Here is our apple fact sheet:

Growing Apples in the Home Orchard | Ohioline (osu.edu)

Your poor apples trees possibly have apple scab (apple get it every year), root rot (due to too much rain this year), and insect damage. Do not know if periodical cicada laid eggs on one of the branches. Cicada can cause little branches to wilt and eventually fall off. 

Here is our bulletin on pest management. There is a spray schedule for apple trees:

Controlling Diseases and Insects in Home Fruit Plantings, Bulletin 780 (whole).pdf (osu.edu)

Since the chemicals labelled for home fruit planting may not be strong enough, following a spray schedule to the T may or may not be 100% effective. This is because our springs are always wet.

Commercial growers also use an air blast spray that gets good coverage. 

Here is the bulletin that they use: id-232.pdf (uky.edu)

Sevin can be applied to apple trees, but it should be applied after 7:00 pm to avoid/minimize damage to bees.

Fruit bagging is a way to manage pest in apples: Bagging Apples: Alternative Pest Management for Hobbyists | Entomology (uky.edu)

Hope this helps.