Abstract
DURING a recent outbreak of fire blight in Britain1,2 more than 150 isolations of the pathogen, Erwinia amylovora, have been made in this laboratory. On initial plating of infected material two types of colony are often observed3. The dominant type has characteristic markings on ‘Yeastrel’ peptone agar plates incubated at 30° C. For convenience, strains which form this type of colony are called ‘typical’; those forming the second type of colony, which is relatively featureless, and less opaque, are called ‘atypical’. Some strains are intermediate in character, even after re-streaking several times. With some such strains the opacity of individual colonies on a single streak plate may show considerable variation, with others, each individual colony appears mottled; marking may or may not be apparent on the more opaque colonies. Some ‘typical’ strains regularly yield a small proportion of unmarked colonies.
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References
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BILLING, E. An Association between Capsulation and Phage Sensitivity in Erwinia amylovora . Nature 186, 819–820 (1960). https://doi.org/10.1038/186819a0
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DOI: https://doi.org/10.1038/186819a0
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