Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: November 3, 1996
Publication Date: N/A
Interpretive Summary: Summary article; no new research reported; no interpretive summary required.
Technical Abstract: Greenhouse screening of seedlings from the National Small Grains Collection of Hordeum vulgare has identified 106 accessions with some level of resistance to Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko). RWA- resistant barley germplasm lines have been selected from these accessions with seedling resistance ratings ranging from resistant to moderately resistant and moderately susceptible. Resistance to insects in the seedlin stage is not always a guarantee of resistance at later stages of plant development and can depend upon genotype as well as stage of development at infestation and duration of infestation. Ten RWA-resistant barley germplasm lines with varying seedling resistance ratings and one susceptible cultivar, 'Morex', were grown in the greenhouse and infested with RWA at three seedling stages. Aphid populations increased tremendously through plant maturity. The effect of RWA feeding on grain yield and yield components will be discussed as well as the value of greenhouse seedling resistance ratings as predictors of RWA resistance in mature plants.