PHYTOPROTECTION, cilt.97, sa.1, ss.12-16, 2017 (SCI-Expanded)
Erwinia amylovora causes fire blight mainly on pear, apple and quince trees. This bacterial pathogen also infects other Rosaceous plants, such as blackberry and raspberry. A race structure was established between an isolate of E. amylovora and berries using 40 wild blackberry and 7 wild raspberry genotypes. In pathogenicity tests, wild blackberry and raspberry genotypes had three phenotypic reactions: enhanced susceptibility, moderate susceptibility and resistance. We noted a higher bacterial growth of over 300 x 10(9) cfu mL(-1) in plants with enhanced susceptibility, with resistant genotypes showing a bacterial growth of around 150 x 109 cfu m-1. These results are also associated with symptoms observed at 29 days post-inoculation. This resistance is being evaluated to control fire blight.