Previous View
APSnet Home
Plant Disease Home

Disease Note.

Puccinia graminis subsp. graminicola Identified on Tall Fescue in Oregon. R. E. Welty, USDA-ARS, National Forage Seed Production Research Center, Corvallis, OR 97331-7102. Mark E. Mellbye, Oregon State University Extension Service, Oregon Agricultural Experiment Station, Corvallis 97331. Plant Dis. 73:775. Accepted for publication 18 May 1989. Copyright 1989 The American Phytopathological Society. DOI: 10.1094/PD-73-0775A.

Stem rust on tall fescue (Festuca arundinacea Schreb.) was sporadic throughout seed production fields in the Willamette Valley of Oregon in spring of 1987. In 1988, the disease was widespread and rated as moderate to severe in 22 of 29 cultivars evaluated. Urediniospores of the fungus were recovered from cv. Bonanza and used to inoculate Bonanza in the greenhouse. Leaves of Bonanza with pustules of urediniospores were deposited in the stem rust collection at the USDAARS Cereal Rust Laboratory, St. Paul, Minnesota. In 1942 (1), stem rust was recorded on F. pratensis Hudson (= F. elatior L.) in Washington and northeastern and western Oregon and on F. arundinacea (F. elatior var. arundinacea (Schreb.) Wimm.) in Washington. No cases of stem rust occurring on tall fescue are recorded in disease clinic files at Oregon State University. To our knowledge, this is the first report of Puccinia graminis Pers. subsp. graminicola Urban being a serious and widespread pathogen on F. arundinacea in the Willamette Valley in Oregon.

Reference: (1) G. W. Fisher et al. Plant Dis. Rep. Suppl. 137:87, 1942.