In the spring of 2022 we bought 3 apple trees from a family-owned garden center. Sweet Sixteen, honey crisp and Frostbite. At that time, we put a small ring and layer of bagged natural colored wood chips around each tree and put up a fence around each. That year we got flowers on each of them, however the bloom time was a bit different on each so I’m guessing they got pollinated from the crab apple trees about 50-60 feet away. We got a couple apples on 2 of the trees, but they were small and the birds got to them. 2023 we got just a couple of apples on 2 of the trees again. Still very small, we tasted one and it was sour. So again we assumed it got pollinated from the crab apple trees. In the spring of 2024, we spread out wood chips we had gotten from a tree service working in the area. These chips were larger than the bagged wood chips and we made the rings around the trees much larger and deeper. I would guess that it was about 8 inches deep at first, however it has settled a lot since then. We only got flowers on the Frostbite tree. The other 2 never produce flowers. We got apples also they are a little bigger than the previous years. (again, assuming pollination from the crab apple trees). One apple has fallen off as of yesterday. Each winter we have put the plastic guards around the trunks for protection. I have noticed that all 3 trees have rusted leaves. I am not sure which type of disease they have or how to treat it. Can you give me any info on what to do. I have included pictures of the trees and the leaves.