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White Pine Blister Rust

USDA Forest Service Archive, USDA Forest Service, Bugwood.org
 White Pine Blister Rust disease attacks pines with 5 needles per fascicle. That includes Eastern and Western white pine, sugar pine and limber pine. Seedlings are in greatest danger.
Cronartium ribicolais a rust fungus and can only be infected by basidiospores produced on Ribes (current and gooseberry) plants. It is native to Asia but was introduced to North America. It has invaded most white pine areas and is still making progress into the Southwest and into southern California.
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