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CULTIVARS

Registration of ‘RWA 1758’ Russian Wheat Aphid-Resistant Spring Barley

^a USDA-ARS, National Small Grains Germplasm Research Facility, 1691 S. 2700 W., Aberdeen, ID 83210
^b USDA-ARS, 1301 N. Western St., Stillwater, OK 74075
^c Univ. of Idaho Research and Extension Center, 1693 S. 2700 W, Aberdeen, ID 83210

^* Corresponding author (phil.bregitzer{at}ars.usda.gov).

ABSTRACT

‘RWA 1758’ (Reg. No. CV-336; PI 648913) is a spring, Russian wheat aphid (Diuraphis noxia Mordvilko) (RWA)–resistant two-rowed barley (Hordeum vulgare L.) developed by the USDA-ARS. RWA 1758 was selected and released on the basis of competitive agronomic performance and resistance to damage caused by RWA feeding. RWA 1758 derives from a BC₃F_3:4 selection from the cross ‘Baronesse’*4/STARS 9577B. It was tested under the experimental designation 01ST1758. STARS 9577B is a six-rowed spring RWA-resistant germplasm line developed and released by the USDA-ARS. STARS 9577B is resistant to the five RWA biotypes known to be present in the United States. STARS 9577B was developed via selection from CIho 4165, a landrace originally collected in Afghanistan. The main component of the resistance is tolerance, conferred by two dominant genes with recessive epistasis.

Abbreviations: WRDSBN, Western Regional Dryland Spring Barley Nursery • WRSBN, Western Regional Spring Barley Nursery