The Global Forest Health Crisis: A Public-Good Social Dilemma in Need of International Collective Action.

Address: International Programs, US Forest Service, US Department of Agriculture, Lansing, Michigan, USA; email: [email protected].; Department of Forestry and Natural Resources, Purdue University, West Lafayette, Indiana, USA.; Department of Entomology, Purdue University, West Lafayette, Indiana, USA.; Institute of Food and Agricultural Sciences, University of Florida, Gainesville, Florida, USA.; Center for Invasive Species Prevention, Bethesda, Maryland, USA.; Cary Institute of Ecosystem Studies, Millbrook, New York, USA.; Centro de Investigación y Extensión Forestal Andino Patagónico, Consejo Nacional de Investigaciones Científicas y Técnicas, Esquel, Chubut, Argentina.; Department of Entomology, University of Wisconsin-Madison, Madison, Wisconsin, USA.; D. B. Warnell School of Forestry and Natural Resources, University of Georgia, Athens, Georgia, USA.; Institute for Sustainable Plant Protection, National Research Council, Sesto Fiorentino, Italy.; Dorena Genetic Resource Center, US Forest Service, US Department of Agriculture, Cottage Grove, Oregon, USA.; Forestry and Agricultural Biotechnology Institute, University of Pretoria, Hatfield, Pretoria, South Africa.; Department of Plant Pathology, The Ohio State University, Columbus, Ohio, USA; email: [email protected].