Agronomy, Volume 11, Issue 1 (January 2021) – 190 articles
Cover Story (view full-size image): Fire blight caused by the bacterial pathogen Erwinia amylovora is a devastating disease of apple (Malus). In 2020, a naturally occurring fire blight outbreak caused by a streptomycin-resistant strain of E. amylovora occurred in the United States Department of Agriculture (USDA) National Plant Germplasm System Malus collection, presenting a rare opportunity to assess fire blight susceptibility in diverse Malus species. Phenotypic evaluation of fire blight severity was conducted for 1142 trees in June, representing 41 species, and again in July, with a 667-tree subset of 34 species. After fire blight infections were removed by pruning, 2525 trees representing 48 species were rated on a scale of 0–6 for cut severity. Trees with cut severity ratings of ≤3 may be mildly resistant to fire blight, while trees with severity ratings of ≥4 were highly susceptible. View this paper
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