Abstract
Twelve isolates of the leaf rust pathogen Melampsora medusae Thüm., collected from six locations across the eastern U.S.A., were tested for their reaction on 18 poplar genotypes at two temperatures of incubation (16 and 26 °C). All isolates were recognized as distinct physiologic races, based on the qualitative and quantitative reaction of the isolates on the cultivars. Temperature was an important factor in determining the level and type of disease expression in most cultivar – isolate combinations. The results support the hypothesis that the physical environment may have an important role in the regulation of this "wild" pathosystem. The high degree of race specificity observed in the Populus genotypes and the polymorphism for virulence in the M. medusae population emphasize the importance of maintaining host diversity to manage this disease.
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