Registration of 'Stoneham' Spring Feed Barley Resistant to Russian Wheat Aphid

'Stoneham' (Reg. No. CV-349, PI 641940), a spring, two-rowed, feed barley (Hordeum vulgare L.) that is resistant to the Russian wheat aphid (RWA; Diuraphis noxia Kurdjumov) was developed and released by the USDA-ARS, Stillwater, OK and Aberdeen, ID and the Colorado and Nebraska Agricultural Experiment Stations in 2006. Introduction of the RWA to the United States effectively eliminated spring barley, the preferred alternate crop, from winter wheat (Triticum aestivum L.) rotations in eastern Colorado and western Nebraska. 'Otis', a spring barley that is well adapted to the high dry plains, is susceptible to RWA. Stoneham, with RWA resistance from STARS 9577B transferred to Otis, outperformed Otis in yield trails at 11 location-years in this marginal production area both in the presence and absence of RWA. A total of eight RWA biotypes (RWA1-RWA8) have been identified in the High Plains based on winter wheat differentials. Both Stoneham and Sidney, the first RWA-resistant, drought-hardy cultivar to be released, are resistant to all eight RWA biotypes. Resistance to RWA is under different genetic control in Stoneham and Sidney. The release of cultivars with different sources of resistance is an attempt to increase the durability of resistance in spring barley against future changes in biotype.