Mark, Thanks for the questions. I don't believe your tree has a bacterial disease. Fire blight would be the most likely on a crab apple tree. FB symptoms show on individual branches at the tip. Leaves turn completely brown and dry up as if scorched by a fire. Here is the link for you to learn more and compare: https://extension.umn.edu/plant-diseases/fire-blight

I believe your tree has a fungal disease. Apple scab is very common on crab apple trees. Brought on by wet, humid, cool weather. Though leaf curl is not typical for apple scab fungus. Typically, the tree will not die and will recover without any treatment. Here is a link for more detailed information: https://extension.umn.edu/plant-diseases/apple-scab

The look of those leaves look like anthracnose, another common fungal disease. Though I don't find crab apple listed as a host tree. Again, not serious. The tree will recover! Here is a link: https://extension.umn.edu/plant-diseases/anthracnose-trees-and-shrubs

Your rose leaf damage looks like insect damage. Perhaps sawflies or leaf miners. Look closely to see if you can see any insect present. Here is a link from University of Wisconsin on sawfly damage on roses. See if you agree? https://insectlab.russell.wisc.edu/2022/05/31/whats-eating-my-roses-in-spring-sawflies/

Paul

Master Gardener volunteer