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The Overwintering Of The Fireblight Bacteria Outside Of Living Tissue In Utah, Sherman V. Thomson
The Overwintering Of The Fireblight Bacteria Outside Of Living Tissue In Utah, Sherman V. Thomson
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The purpose of this investigation was to determine the sites of overwintering of Erwinia amylovora (Burrill) Winslow et al. outside of living tissue in Utah. Bacterial isolates were taken from the surfaces of blighted twigs and mummified fruits remaining on the tree; also from internal dead tissue of blighted twigs and mummies, and from soil beneath blighted trees. Each isolate was tested for agglutination with antiserum specific for Erwina amylovora, susceptibility to Erwinia amylovora bacteriophage, production of symptoms in pear seedlings and development of bacterial ooze on green pears.
Both virulent and avirulent isolates were taken from all sites tested. …