A bit of SERIOUS. My sister visited the Aubs last weekend. She's no expert (on anything but childbirth), but she said, "Looks like the leaves on the oaks are curling."
"Curling?" I asked (men can't stay on task).
curling downward would indicated illness. curling upward indicates lack of nutrients.
All they have to do is wash out the soil. It'll be messy, but it'll clean it up. Probably too late for the trees though.