I just moved to my property last fall. We noticed these brown, hard, lumpy balls on the oak tree behind the house and didn't know what they were. I searched on the internet, but found at least 7 different answers ranging from parasitic wasps to a harmless, but ugly fungus. As we drive around, I've noticed this part of Indiana is INFESTED with it, especially Shingle Oaks and Cedars. So, not knowing what I am dealing with, I bought apple trees! Now my Golden Delicious is covered in yellow spots although the Stayman's Winesap isn't affected yet. Can I sucessfully fight CAR when it's this bad on my property and all around me too? Do I just give up and plant something else? Reality bites!