Analysis of AluI-Eco72I digestion of FD9f6-MAPr2 PCR products on 8% polyacrylamide gels and restriction map of the different FD strain clusters. Lane 1, healthy grapevine; lanes 2 to 12, grapevine samples V03-5-3, V04-11-18, V04-11-11, V00-SP9, V04-11-17, V04-11-30, V04-11-39, VI04-C29, VI04-Lig1, VI04-Toscana1, and VI04-248-04, respectively. Lane M, 1-kb ladder from Invitrogen.