Submitted to: Barley Newsletter
Publication Type: Other
Publication Acceptance Date: 2/28/1998
Publication Date: N/A
Technical Abstract: Stem rust caused little damage to barley in the U.S. in 1997. Losses were estimated at 0.02% with the greatest yield loss (0.2%) reported from WA. All stem rust races isolated from barley were of the wheat form, Puccinia graminis f.sp. tritici. Race QCCJ, which overcomes the Rpg1 type of resistance in barley, was not found on any host in 1997. Race QCCJ had caused significant losses in previous years. Nationally, barley leaf rust caused by P. hordei caused about 0.13% loss of yield in barley, but losses in NC (5%), OR (2%), CA (1%), and ID (1%) were significant. Ten races of P. hordei were identified in 1997 with races RHD, MCD, and MCJ being the most common. Barley stripe rust caused by P. striiformis f.sp. hordei was severe in 1997 in CA (20% yield loss) and caused significant losses in OR (4%). Losses to stripe rust were lighter in WA (0.5%) and ID (0.1%), because stripe rust did not become severe in WA and ID until the barley was snearly mature. Barley crown rust caused by P. coronata f.sp. hordei was spotty in occurrence in ND, SD, and MN again in 1997, with the rust being limited mostly to sites close to its alternate host, Rhamnus cathartica. Yield losses to barley crown rust were negligible, although crown rust was found at up to 80% severity on susceptible barley cultivars in a nursery in east central SD.