Isolation of Pseudomonas syringae from 40 Cultivars of Diseased Woody Plants with Tip Dieback in Pacific Northwest Nurseries. Marilyn L. Canfield, Research Assistant, Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331. Steve Baca, Graduate Research Assistant, and Larry W. Moore, Associate Professor, Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331. Plant Dis. 70:647-650. Accepted for publication 3 February 1986. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/PD-70-647.

Bacteria were isolated from 40 cultivars of woody plants with tip dieback during 1981 and 1982. Plants most severely affected were maple (Acer spp.), dogwood (Cornus florida), filbert (Corylus avellana), blueberry (Vaccinium corymbosum), magnolia (Magnolia spp.), lilac (Syringa sp.), oriental pear (Pyrus pyrifolia), aspen (Populus tremuloides), and linden (Tilia americana). Of the 556 bacterial strains tested, 466 (84%) were fluorescent, and 303 (65%) of the fluorescent strains were identified as Pseudomonas syringae.