Date of Award:
5-1969
Document Type:
Thesis
Degree Name:
Master of Science (MS)
Department:
Plants, Soils, and Climate
Department name when degree awarded
Botany and Plant Pathology
Committee Chair(s)
O. S. Cannon
Committee
O. S. Cannon
Committee
B. N. Wadley
Committee
P. B. Carter
Abstract
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. There was also a slight increase in the number of Erwinia amylovora isolates taken as spring approached. There was no apparent difference in apple or pear trees as overwintering hosts.
Checksum
947866174eef9ffb3c87fc0e6d382740
Recommended Citation
Thomson, Sherman V., "The Overwintering of the Fireblight Bacteria Outside of Living Tissue in Utah" (1969). All Graduate Theses and Dissertations, Spring 1920 to Summer 2023. 2999.
https://digitalcommons.usu.edu/etd/2999
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