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ARS Home » Pacific West Area » Aberdeen, Idaho » Small Grains and Potato Germplasm Research » Research » Publications at this Location » Publication #131958


item GOATES, BLAIR - 5366-05-00

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: 4/1/2002
Publication Date: 7/1/2002
Citation: Goates, B.J. Characterization of a new virulent race of tilletia controversa. Phytopathology.

Interpretive Summary:

Technical Abstract: Dwarf bunt of wheat, caused by Tilletia controversa, is controlled with resistant cultivars where the disease has the potential to occur regularly. In 1999, up to 10% bunted spikes occurred in a few southern Idaho farms on two cultivars that historically were extremely resistant. Isolates of this bunt were used to inoculate 12 highly resistant cultivars, 2 partially resistant cultivars, and 15 differential cultivars in two tests performed in 2000 and 2001 to determine their potential virulence. The new race caused 35 to 90% bunted spikes in the cultivars Boundary, Hansel, Manning, Promontory, Survivor, Utah 100, and Weston which have had very little infection in commercial fields and in nurseries inoculated with a broad composite of pathogenic races. Partially resistant cultivars Eltan and Kmor had markedly increased disease. The new race caused little or no increase in disease in the cultivars Blizzard, Bonneville, Garland, Golden Spike, Lewjain, Luke, and Winridge. The virulence of this new race appears primarily due to combined virulence to the resistance genes Bt3, Bt9, and Bt10, but low virulence to Bt8 could also be contributing. Resistance to the new race apparently comes from Bt12, but also from unknown factors.