The cedar hawthorn rust is a serious disease of hawthorn and juniper trees and while there is no cure for the disease, prevention is the most important thing to do before it spreads. This particular disease is a disfiguring condition of hawthorns and junipers and the tree never recovers from the damage. You can prune out the worst of it, but once it affects the entire tree, your only choices are to learn to live with it or take the tree down. In addition to the rust-colored spots on the leaves, hawthorns may have rusty-looking ‘fingers' projecting from the fruit.

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Source: Gardening Know How