A: This being the end of October, I can start giving my favorite solution to many of these issues.
Don’t worry, and don’t do a thing.
The crapemyrtle did take more summer heat stress than normal, but it should be perfectly fine next year. The redbud does have a minor fungal disease of its leaves, but spraying it now will accomplish exactly as much as five weeks of time will – the damaged leaves will fall off for winter, and it will put out healthy foliage next spring. (Just rake the old leaves away.) The Japanese maple is also showing damage due to the extreme heat this summer, but will likely be fine next spring unless you also saw some damage to the bark of the tree.
Deciduous trees and shrubs often show a host of minor leaf issues as they ready themselves to drop their foliage for the winter. All of these issues are exactly that, minor, and probably don’t justify “Doing Something”. We are just showing more of these issues than normal this year because of the high temperatures of our summer and record-breaking rainfall since September. If you see this kind of issue on an evergreen tree or shrub, you may well need to do something, but your deciduous plants should be fine.
If you’d like to learn more about these and more of our favorite plants, join us this Saturday, October 27th for our Top Ten “Tried & True Plants for Your Landscape” class on selecting and planting small ornamental trees and shrubs. The class is free and no registration is necessary.