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Eric Coombs, Oregon Department of Agriculture, Bugwood.org

Eric Coombs, Oregon Department of Agriculture, Bugwood.org

USDA Forest Service - Region 4 - Intermountain , USDA Forest Service, Bugwood.org

USDA Forest Service - Region 4 - Intermountain , USDA Forest Service, Bugwood.org

Rayanne Lehman, Pennsylvania Department of Agriculture, Bugwood.org

Rayanne Lehman, Pennsylvania Department of Agriculture, Bugwood.org

Rayanne Lehman, Pennsylvania Department of Agriculture, Bugwood.org

Rayanne Lehman, Pennsylvania Department of Agriculture, Bugwood.org

Rayanne Lehman, Pennsylvania Department of Agriculture, Bugwood.org

Rayanne Lehman, Pennsylvania Department of Agriculture, Bugwood.org

Whitney Cranshaw, Colorado State University, Bugwood.org

USDA Forest Service - Forest Health Protection Intermountain Region - Ogden, UT , USDA Forest Service, Bugwood.org

A. Steven Munson, USDA Forest Service, Bugwood.org

Petr Kapitola, Central Institute for Supervising and Testing in Agriculture, Bugwood.org

O.P. Sharma, Bugwood.org

Howard F. Schwartz, Colorado State University, Bugwood.org

David Gent, USDA Agricultural Research Service, Bugwood.org

Eric Coombs, Oregon Department of Agriculture, Bugwood.org

Bruce Watt, University of Maine, Bugwood.org