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A pine branch swollen into a spindle-shaped gall with rough bark caused by white pine blister rust, Cronartium ribicola.

A several foot section of a swollen pine branch with bundles of unhealthy, orangish needles in the background. Credit: USDA Forest Service, Northern and Intermountain Region, Bugwood.org — Credit: USDA Forest Service, Northern and Intermountain Region, Bugwood.org

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