"Had a call today from a woman, frantic that space aliens had invaded her tree. After she explained what kind of tree it was I pretty well knew what she had. We had a good rain overnight and her tree was a cedar (or really juniper) so I figured I'd go and take a pic." - Jebtaboz

I get this complaint every year in late Spring. Cedar Apple Gall Rust is a fungus that appears on redcedar and is actually one of the only "galls" not induced by an insect. This gall is a fungus and apple trees are its alternate host - no nearby apples, no galls. It will not harm your tree!

• Common Tree Galls
• Eastern redcedar - 100 Most Common Trees

_{Cedar Apple Gall Rust on Eastern Red Cedar - Photo by Jim Zornes}