Daniel Adam, Office National des Forêts, Bugwood.org

Maja Jurc, University of Ljubljana, Bugwood.org

Pest and Diseases Image Library , Bugwood.org

Stanislaw Kinelski, Bugwood.org

Robert Dzwonkowski, Bugwood.org

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

Maja Jurc, University of Ljubljana, Bugwood.org

Pest and Diseases Image Library , Bugwood.org