The Q&A Archives: Cedar Tree Rust?

Question: I have a mature cedar tree that recently had bright orange sacks at the tips of the branches. Is that cedar rust and, if so, how do I treat it? I also have several crab apple trees and don't want them to be infected with cedar apple rust, so what is your recommendation? Thanks for your help.

Answer: Sounds like cedar apple rust alright. Though they are ugly, the fungal growths don't cause dire harm to cedars. But you can prune the infected portion of the shoots from the tree if you wish. If the infection spreads to your crabapple, it will be in the form of orange spots on the tree's leaves, not the orange blobs evident in the cedar. If the orange growths in the cedar have produced their long, gooey "arms", then the spores are in the air and may have made their way to your crab by now. If not, you have time to apply a preventive spray. Gardens Alive sells a product called Soap Shield which helps control the disease on apples. Contact Gardens Alive via their Web site at Best of luck to you!

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