R.J. Reynolds Tobacco Company , Bugwood.org

R.J. Reynolds Tobacco Company , Bugwood.org

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

R.J. Reynolds Tobacco Company , Bugwood.org

R.J. Reynolds Tobacco Company , Bugwood.org

R.J. Reynolds Tobacco Company , Bugwood.org

R.J. Reynolds Tobacco Company , Bugwood.org

University of Georgia Plant Pathology , University of Georgia, Bugwood.org

Mary Ann Hansen, Virginia Polytechnic Institute and State University, Bugwood.org

Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org

Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org

Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org

Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org