First report of the Eurasian poplar leaf rust fungus, Melampsora larici-populina, in North America

Journal Article · Sat May 01 04:00:00 EDT 1993 · Plant Disease; (United States)

DOI:https://doi.org/10.1094/PD-77-0532· OSTI ID:6446545

Newcombe, G; Chastagner, G A ^[1]

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1. Washington State Univ., Puyallup (United States)

Melampsora larici-populina, native to Eurasia, was found in October 1991 in hybrid poplar (Populus trichocarpa X P. deltoides) plantations along the Columbia River near Woodland, Washington, and Scapposse, Oregon. Clavate to broadly ellipsoid urediniospores measured 30--49 X 13--16 [mu]M and were echinulate except for an apical smooth patch. Telia were exclusively epiphyllous. Detached leaf inoculations were used to investigate the telial (poplar) host range of three different monouredinial isolates in the laboratory. Clones known to be susceptible in Europe and Australia to M. larici-populina (i.e., P. nigra var. italica and P. X euramericana cv. I-488) were susceptible in these tests, as were 20 clones of P. trichocarpa, the native black cottonwood of the Pacific Northwest. In general, the pattern of susceptibility among 50 clones representing many poplar taxa, including interspecific hybrid classes, was in accord with what is known of the host range of M. larici-populina in Europe and Australia. Pathogenic variation among the three isolates was not observed. 22 refs., 1 fig., 1 tab.

• OSTI ID: 6446545
• Journal Information: Plant Disease; (United States), Journal Name: Plant Disease; (United States) Vol. 77:5; ISSN 0191-2917; ISSN PLDIDE
• Country of Publication: United States
• Language: English

Related Subjects

550700* -- Microbiology
59 BASIC BIOLOGICAL SCIENCES
ASIA
AUSTRALASIA
AUSTRALIA
COLUMBIA RIVER
DEVELOPED COUNTRIES
DISEASES
DISTRIBUTION
EUROPE
FUNGAL DISEASES
HOST
INFECTIOUS DISEASES
LEAVES
MAGNOLIOPHYTA
MAGNOLIOPSIDA
NORTH AMERICA
OREGON
PLANTS
POPLARS
RIVERS
STREAMS
SURFACE WATERS
TREES
USA
WASHINGTON