Submitted to: Plant Resistance to Insects Newsletter
Publication Type: Other
Publication Acceptance Date: December 31, 1997
Publication Date: N/A
Interpretive Summary: Summary article; no new research reported; no interpretive summary required.
The barley genetics program continued with two main objectives: to develop and test genetic populations to determine the inheritance of Russian wheat aphid (RWA) resistance in all 106 previously selected RWA-resistant barley lines, and to develop and test genetic populations to determine genetic diversity for RWA resistance in barley. Three new resistant lines were selected from resistant accessions and have been added to the genetics program. Efforts are ongoing to develop RWA-resistant wheat lines for all market classes that are grown in areas where RWA is a problem. Over 55 advanced lines derived from 8 different RWA resistance sources were planted for seed increase and evaluation in preparation for germplasm release; these lines include hard red and hard white winter wheats as well as hard and soft white spring, and hard red spring wheat. Different species of wheatgrasses continue to be evaluated for resistance to the RWA; also the mechanisms of the resistance identified in the wheatgrass species are bein identified. We recently evaluated all available crested wheatgrass entries. Baseline information on the biotypic status of RWA populations in the USA prior to the commercial planting of RWA-resistant small grains has been reported.