Maja Jurc, University of Ljubljana, Bugwood.org

Pest and Diseases Image Library , Bugwood.org

Daniel Adam, Office National des Forêts, Bugwood.org

Louis-Michel Nageleisen, Département de la Santé des Forêts, Bugwood.org

Andrea Battisti, Universita di Padova, Bugwood.org

Jean-Paul Grandjean, Office National des Forêts, Bugwood.org

Maja Jurc, University of Ljubljana, Bugwood.org