Cedar Apple Rust

Q: I have two seven-foot tall Eastern red cedar trees. Both have growths that look like walnut meats on them. Is this cedar apple rust?

A: Orange, jelly-like spore “gobs” were on the trees last spring but you didn’t notice them. The gall you notice now will be at the center of the fist-sized mass in April-May. This particular disease travels back and forth between red cedar and apple trees. Both hosts are required for it to develop.

Cedar apple rust is less harmful to cedars than apples, on which it causes leaf and fruit drop. If you value woodland apples and crabapples, remove all of the dried galls now.

MORE INFORMATION:

Rust Diseases of Fruiting Plants

Cedar Rust Diseases of Ornamental Plants

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