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Title: STATUS OF RWA-RESISTANT BARLEY GERMPLASM

Author
item Mornhinweg, Dolores - Do
item Bregitzer, Paul
item Wesenberg, Darrell
item HAMMON, BOB - COLORADO STATE UNIV
item PEAIRS, FRANK - COLORADO STATE UNIV

Submitted to: North American Barley Research Workshop Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 7/1/2002
Publication Date: 9/25/2002
Citation: Mornhinweg, D.W., Bregitzer, P.P., Wesenberg, D., Hammon, B., Peairs, F.B. 2002. Status of RWA-resistant barley germplasm. Proceedings of the 17th North American Barley Research Workers Workshop, September 22-25, 2002, Fargo, ND.

Interpretive Summary:

Technical Abstract: Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko), is a devastating pest on barley in the western U.S. First identified in the US in 1986 it spread throughout the intermountain regions of the western US and into Canada by 1988. All currently grown barley cultivars were highly susceptible to RWA and losses were high. Screening of the entire National Small Grains Collection of Hordeum vulgare by the USDA-ARS in Stillwater, identified 109 accessions with some level of RWA resistance. Unadapted RWA-resistant germplasm lines were developed from each of these accessions and two were released to breeders, STARS-9301B and STARS-9577B. Although highly resistant, these lines were very unadapted to US barley production and were quite poor in terms of grain yield and malting quality. A prebreeding program was initiated cooperatively by the USDA-ARS in Stillwater, OK and Aberdeen, ID, to bring RWA resistance into adapted backgrounds that could be utilized more effectively for cultivar development by breeders in all barley growing areas of the U.S After 2 years of preliminary yield testing, 56 RWA-resistant germplasm lines are possible for release involving 14 susceptible backgrounds (spring, winter, feed, malt) and 32 resistant sources.