A Proposed International Program for Testing White Pine Blister Rust Resistance1

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Abstract
A two‐stage, international blister rust resistance test program proposed by the IUFRO Committee on (resistance to) White Pine Blister Rust is described. First, there would be a reevaluation of “naturally” resistant Eurasian white pines from near the original white pine: Cronartium ribicola gene center(s). Next, there would be more sophisticated testing of North American white pines developed by artificial selection and controlled crossing. Key test centers are needed in Siberia, south‐central Asia, the Baltic‐North Sea countries, and in eastern and western North America. Initial Committee inquiries indicate that 5 of the core cooperators could commence testing in the near future.