BACTERIOPHAGE STUDIES OF ISOLATES FROM FIRE BLIGHT SOURCES

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Abstract
Six hundred and sixteen Gram-negative bacterial isolates were obtained from trees and orchards diseased with fire blight. By serological means, 194 Erwinia amylovora isolates were distinguished from 57 nonpigmented isolates of miscellaneous colonial types. One hundred and eighty-nine isolates were distinguished by yellow colony color. In addition, 176 isolates produced a fluorescent pigment. Four other biochemical tests were applied to the isolates.All of the E. amylovora isolates, 26 'miscellaneous white' isolates, and 94 'yellow' isolates were lysed by one or more of seven phages. Two phages, 1507 and 1508, lysed many isolates from all three groups, and in this way relationships were indicated. Phage sensitivity was not correlated with other characteristics, although phage P19 lysed most of the E. amylovora isolates and none of the yellow. Phage P17 lysed a majority of the 'yellow' isolates and none of the E. amylovora. Both phages lysed some 'miscellaneous white' isolates.

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