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Mycoplasmas Associated with X-Disease in Various Prunus Species. A. L. Granett, Senior Research Associate, Department of Plant Pathology, New York State Agricultural Experiment Station, Geneva 14456; R. M. Gilmer, Professor, Department of Plant Pathology, New York State Agricultural Experiment Station, Geneva 14456. Phytopathology 61:1036-1037. DOI: 10.1094/Phyto-61-1036.

Thin sections of chokecherry, sweet cherry, or mazzard cherry leaves from trees either naturally or experimentally infected with X-disease were examined with the electron microscope. In many sections, elongate mycoplasmas about 200 nm in diam and 720-3,060 nm in length were present in mature phloem sieve tube elements. These mycoplasmas were morphologically similar to those associated with peach Western X-disease. Mycoplasmas were absent in phloem sieve tubes in leaves from healthy controls.