OSU Extension Plant Pathologist has noted that serviceberry (Amelanchier) are in bud break and cedars have spores ready to go. Rain means a big infection period for rust. Rust spores on the cedars do not infect cedars. They infect the rosaceous host like Amelanchier or Pear.
http://plant-disease.ippc.orst.edu/disease.cfm?RecordID=254
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