![]() We used the average proportion of current season’s shoot growth that was blighted to quantify a cultivar’s response to fire blight higher average values indicate higher susceptibility. In 20, we inoculated multiple actively-growing shoots per tree with a virulent strain of Erwinia amylovora (Figs. Cultivars on M.111 rootstocks were planted at WSU Columbia View Research Orchard. We determined fire blight resistance/susceptibility levels of 94 apple cultivars and important breeding parents through a two-year, replicated field inoculation study that focused on shoot infection.
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