Norway spruce (Picea abies)

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Robert Vidéki, Doronicum Kft., Bugwood.org

Paul Wray, Iowa State University, Bugwood.org

Norbert Frank, University of West Hungary, Bugwood.org

Paul Wray, Iowa State University, Bugwood.org

Paul Wray, Iowa State University, Bugwood.org

Keith Weller, USDA Agricultural Research Service, Bugwood.org

Keith Kanoti, Maine Forest Service, Bugwood.org

Gil Wojciech, Polish Forest Research Institute, Bugwood.org