Mechanical Transmission of Xanthomonas campestris pv. pruni in Plum Nursery Trees. C. A. Goodman, Department of Plant Pathology, University of Stellenbosch, Stellenbosch 7600, South Africa. M. J. Hattingh, Department of Plant Pathology, University of Stellenbosch, Stellenbosch 7600, South Africa. Plant Dis. 72:643. Accepted for publication 19 February 1988. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/PD-72-0643.

Xanthomonas campestris pv. pruni was transmitted from cankers on diseased plum trees to susceptible nursery trees during pruning. Transmission was more frequent when trees were pruned under cool, wet conditions than under hot, dry conditions. Rapid canker formation on shoots and severe necrosis of leaf veins were consistent with movement of the pathogen through xylem vessels.

Keyword(s): bacterial spot.