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

David B. Langston, University of Georgia, Bugwood.org

David B. Langston, University of Georgia, Bugwood.org

Robert Wick, University of Massachusetts, Bugwood.org

Virginia Tech Learning Resources Center , Virginia Polytechnic Institute and State University, Bugwood.org

Virginia Tech Learning Resources Center , Virginia Polytechnic Institute and State University, Bugwood.org

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

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

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