ARS | Publication request: RACES OF PUCCINIA STRIIFORMIS F. SP. HORDEI, THE PATHOGEN OF BARLEY STRIPE RUST IN THE UNITED STATES IN 2004

Submitted to: Barley Genetics Newsletter
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: April 1, 2005
Publication Date: June 2, 2005
Citation: Chen, X., Penman, L. 2005. Races of puccinia striiformis f. sp. hordei, the pathogen of barley stripe rust in the united states in 2004. Barley Genetics Newsletter 35. Online.

Interpretive Summary: In 2004, stripe rust of barley occurred mainly in California, Idaho, Oregon, and Washington and caused localized damage to barley crops. Growing cultivars with high-temperature, adult-plant resistance and the cropping system contributed to the low level of stripe rust. Stripe rust samples were collected from the four states and tested under controlled greenhouse conditions on seedlings of a set of 12 barley varieties used to differentiate races of the pathogen. A total of 15 races were detected, of which three were new. Frequencies of these races and predominant races were determined. The information on distribution of the disease and races and their frequencies of the pathogen is useful for control of the disease.

Technical Abstract: Stripe rust of barley, caused by Puccinia striiformis f. sp. hordei (PSH), occurred mainly in California, Idaho, Oregon, and Washington and caused localized damage to barley crops. Growing cultivars with high-temperature, adult-plant resistance and the cropping system contributed to the low level of stripe rust. Stripe rust samples were collected from the four states and tested under controlled greenhouse conditions on seedlings of a set of 12 barley genotypes used to differentiate races of the fungal pathogen. A total of 15 races were detected, of which three were new. PSH-72, a new race, was virulent on all 12 differential genotypes. The most predominant race was PSH-71 that was virulent on differential genotypes Topper, Emir, Hiproly, Varunda, Abed Binder 12, Trumpf, Mazurk, Bigo, and Bancroft.