|Peairs, Frank - COLORADO STATE UNIVERSITY|
|Randolph, T - COLORADO STATE UNIVERSITY|
Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: August 28, 1999
Publication Date: September 1, 1999
Citation: Mornhinweg, D.W., Bregitzer, P.P., Jones, B.L., Porter, D.R., Webster, J.A., Peairs, F.B., Randolph, T.L. 1999. Effect of Russian wheat aphid (RWA) on yield and malt of adapted RWA-resistant barley germplasm [abstract]. American Society of Agronomy. Agronomy Abstracts. p. 77. Technical Abstract: Resistance to RWA, Diuraphis noxia (Mordvilko), has been identified in 109 barley accessions from the National Small Grains Germplasm Collection. Resistant lines selected from these accessions were identified, selected, and purified via screening of seedlings in greenhouse flats. Resistance, measured as grain yield, was confirmed to persist throughout the life of the plant when a subsample of unadapted RWA resistant lines with differing levels of resistance were grown under constant RWA pressure in the greenhouse and in the field. Resistant lines were not significantly affected by RWA feeding, moderately resistant lines were moderately affected, and moderately susceptible and susceptible lines were severely affected. Resistance, measured as malting quality, was inconclusive because the unadapted resistant lines had such poor quality that reduction in quality was impossible to measure. In the spring of 1998, six adapted RWA resistant germplasm lines, their adapted susceptible parents, and their unadapted resistant parent were planted in the field in Idaho and Colorado. Plots were aphid-free or artificially infested at either an early or late date. Both agronomic and malt data indicated no significant effect of RWA feeding on adapted resistant lines and their unadapted resistant parent while an adapted moderately resistant line and the susceptible adapted parents were severely affected by RWA feeding.