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Canker of Loquat Caused by Pseudomonas sp.. Mingtan Lai, Plant Pathologist, Bureau of Plant Pathology, California Department of Agriculture, Sacramento 95814; William O. McCartney(2), and Carl W. Morin(3). (2)(3)Plant Pathologist, and Agricultural Biological Technician, respectively, Bureau of Plant Pathology, California Department of Agriculture, Sacramento 95814. Phytopathology 61:248-249. DOI: 10.1094/Phyto-61-248.

A species of Pseudomonas that incites stem cankers on loquat trees was found in California for the first time in 1969. The bacterium, which apparently infects only loquats, is a green fluorescent, arginine dihydrolase-negative, oxidase weak-positive, and lipase-producing pseudomonad. The bacterium is serologically unrelated to Pseudomonas syringae and P. savastanoi, and cannot be identified with P. eriobotryae.