Graft transmission of grapevine redleaf disease (GRD) and associated viruses and viroids.

†CF = Cabernet Franc, MR = Merlot.*Single-budded, virus-free scion of Cabernet Franc (CF).GRLaV = Grapevine redleaf-associated virus, GRSPaV = Grapevine rupestris stem pitting-associated virus, GFLV = Grapevine fanleaf virus, HpSVd = Hop stunt viroid, GYSVd-1 = Grapevine yellow speckle viroid 1, GYSVd-2 = Grapevine yellow speckle viroid 2, CEVd = Citrus exocortis viroid, and CEYVd = Citrus exocortis Yucatan viroid.Symptoms and the presence of Grapevine redleaf-associated virus and other viruses and viroids in Cabernet Franc scions grafted onto rootstocks of Merlot and Cabernet Franc with and without GRD symptoms.