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The Significance of Secondary Bloom to Fire Blight Development on Bartlett Pears in Eastern Washington. R. P. Covey, Plant Pathologist, Washington State University, Tree Fruit Research Center, Wenatchee, WA 98801. W. R. Fischer, Agricultural Research Technologist, Washington State University, Tree Fruit Research Center, Wenatchee, WA 98801. Plant Dis. 72:911. Accepted for publication 24 May 1988. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/PD-72-0911.

During a 24 yr period, fire blight infections were recorded and removed from trees in two Yakima Valley Bartlett pear orchards. Except for the second year of the study, when disease incidence was extremely low, 69.496.0% of the fire blight infections originated in secondary blossoms.