Affiliation: | 1Istituto di Patologia e Zoologia Forestale e Agraria, Università di Firenze, Piazzale delle Cascine 28, I-50144 Firenze, Italy;2Finnish Forest Research Institute, P.O. Box 18, FIN-01301 Vantaa, Finland;3Department of Plant Biology, Plant & Forest Pathology Section, P.O. Box 28, FIN-00014 University of Helsinki, Finland |