[1] Univ Naples Federico 2, Dip ArBoPaVe, I-80055 Naples, Italy
[2] Ist Sperimentale Patol Vegetale, CRA, I-00156 Rome, Italy
[3] Univ Minnesota, Dept Plant Pathol, St Paul, MN 55108 USA
[4] Dutch Floweer Bulb Inspect Serv, NL-2160 AH Ah Lisse, Netherlands