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Witches’-Broom of Willow: Salix Yellows. Francis O. Holmes, Retired (APS Emeritus Member), Craney Hill Road, Henniker, New Hampshire 03242; Hiroyuki Hirumi(2), and Karl Maramorosch(3). (2)(3)Cell Biologist, and Program Director of Insect Physiology and Virology, respectively, Boyce Thompson Institute for Plant Research, Yonkers, New York 10701. Phytopathology 62:826-828. Accepted for publication 18 February 1972. DOI: 10.1094/Phyto-62-826.

A witches’-broom disease of Salix rigida in New Hampshire and nearby states spreads in nature. Severely diseased branches commonly die in winter. The disease agent has been transmitted to Salix caprea by grafting, but natural infection of this species has not been observed. Electron micrographs revealed the presence of typical mycoplasmalike bodies in phloem elements of diseased, but not of healthy, plants.

Additional keywords: mycoplasma, electron microscopy.