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USDA ARS Photo Unit, USDA Agricultural Research Service, Bugwood.org

USDA Agricultural Research Service , Bugwood.org

Doug Stone, Mississippi State University, Bugwood.org

Clemson University - USDA Cooperative Extension Slide Series, Bugwood.org

John A. Weidhass, Virginia Polytechnic Institute and State University, Bugwood.org

John A. Weidhass, Virginia Polytechnic Institute and State University, Bugwood.org

Rob Routledge, Sault College, Bugwood.org