1. Department of Science and Technology for Agriculture; Forestry, Nature and Energy (DAFNE); Tuscia University; 01100 Viterbo Italy
2. INRA; UR0407 Pathologie Végétale; F-84143 Montfavet cedex France
3. Departemnt of Plant Pathology; Physiology, and Weed Science; Virginia Tech; Blacksburg VA 24061-0331 USA