[1] INRA, UGAFL Arboriculture, Domaine St Paul Site Agroparc, F-84914 Avignon 9, France
[2] INRA, ENSAM, BDPPC, UMR 1098, 2 Pl Viala, F-34060 Montpellier 1, France
[3] CSIC, CEBAS, Dept Mejora & Patol Vegetal, POB 4195, Murcia 30080, Spain
[4] Univ Pisa, DCDSL, Via Borghetto 80, I-56124 Pisa, Italy
[5] Estacao Agron Nacl Quinta do Marques, P-2780 Oeiras, Portugal
[6] INRA, UMR408, SQPOV, Ctr Rech Avignon, Domaine St Paul Site Agroparc, F-84914 Avignon 9, France
[7] INRA, UERI Gotheron, F-26320 St Marcel, France
[8] Ist Sperimentale Frutticoltura Roma, Via Fioranello 52, I-00040 Campino Aeroporto, Italy
[9] SSSUP St Anna, Via G Carducci 40, I-56100 Pisa, Italy
[10] NAGREF, Plant Protect Inst Volos, Egialias 19 & Chalepa St, GR-15125 Maroussi, Attica, Greece