Dave - did you fertilize them this spring? Are they near a lawn area that got fertilized, maybe with a weed & feed product? Did you have a heavy, drenching rain recently? Was your winter/spring/summer changeover as abrupt as other parts of WI?
Only when the last tree has died and the last river has been poisoned and the last fish has been caught will we realize that we can't eat money. Cree proverb