Fire Blight of Apple and Pear

┬áby Tianna DuPont, Associate Professor, Washington State University; Tim Smith, Washington State University Tree Fruit Extension Specialist Emeritus; Ken Johnson, Professor of Plant Pathology Oregon State University; Youfu Zhao, Washington State University. Updated April 13, 2023. Fire blight is an important disease affecting pear and apple. Infections commonly occur during bloom or on late blooms…