Melampsora Rust in Poplar Plantations Across Southern Ontario. M. Hubbes, Faculty of Forestry, University of Toronto, Toronto, Ontario, Canada M5S 1A1. R. S. Jeng, and L. Zsuffa, Faculty of Forestry, University of Toronto, Toronto, Ontario, Canada M5S 1A1. Plant Dis. 67:217-218. Accepted for publication 12 July 1982. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-217.

Investigations conducted during 1980 found only one rust species, Melampsora medusae, in poplar plantations across southern Ontario, Canada. The poplar clones examined belonged to Populus deltoides and hybrids Populus deltoides × nigra, Populus deltoides × trichocarpa, Populus × jackii, and Populus × jackii × nigra.