Gosh, I have no idea, but why not send the photos to your state's A&M college. I am sure someone there would know. If you find out what it is, do let us know.
Have you spotted any tine little red spiders and webs. It sure looks like spider mites especially in the heat they will cause a lot of damage . You could spray them with an insecticide to see if that helps. I have the same in my garden and a spray with a hose to blow off the mites when I first spot them keeps them in check. In this case insecticide will do them a lot of good and stop the cycle. Read the directions and directions and follow up in two weeks. Once the mites are eliminated they will recover nicely. What A beautiful wind break or living fence.
I’m so busy... “I don’t know if I found a rope or lost a horse.”
