Hello Bill, happy to help.

Sorry this question got overlooked in the queue but better late than never.

I do see the characteristic hooked curving of new growth in your close-ups that tells me it may be fireblight, a fungal disease. By now, you probably have clusters of dead leaves hanging down from your tree if I'm correct. We have had the right weather conditions for the disease. It can be precipitated by damage to the tree, like hail, that opens wounds allowing the fungi to enter.

Because I can't definitively say what it is from a photo, I recommend sending a sample to the U of MN Extension plant disease clinic for a diagnosis and recommended treatment. Here is a link to their website where you'll learn about their services, prices, and how to submit a sample.

Good-luck!