Development and Evaluation of Hop Germplasm for the Washington State Hop Growing Region
Forage Seed and Cereal Research
2010 Annual Report
1a.Objectives (from AD-416)
Develop new hop germplasm adapted to the hop growing region of Washington and evaluate new and advanced experimental germplasm developed by the USDA-ARS for suitability for Washington production.
1b.Approach (from AD-416)
Approximately 100 hop experimental accessions of hop germplasm developed by USDA-ARS will be provided to Washington State University each year where the germplasm will be evaluated under growing conditions representative of the Washington hop growing regions. Single hill observation plots for each accession will be established in the first year (baby year). Production and chemistry data will be collected for two years subsequent to the baby year. Data for the following traits will be collected and documented from the 30% selected individuals:
2) Susceptibility to powdery mildew, aphids and spider mites
3) Bittering acid composition
5) Essential oil composition
Advanced lines identified by USDA-ARS for additional observation under semi-commercial production will be increased and grown out in 5-hill plots at the Prosser research station where data for two years subsequent to the baby year (year of establishment) on the above traits will be collected and recorded. New experimental lines developed at the Prosser station will be provided for evaluation in the Oregon hop producing region. (Congressionally mandated Formerly 5358-21000-035-01S Expired 9/08). Documents SCA with WSU.
Field evaluation of new crosses of hop for use in semi-arid production environments. Field studies demonstrated that most cultivars infected with hop stunt viroid accumulated greatly reduced quantities of alpha acids, up to a 69% reduction in the variety Glacier, but Nugget and Galena did not show reduced alpha acid production. Eighty five selections were evaluated for agronomic properties and 29 of these were harvested for yield data and evaluated for brewing characteristics. Yields of a Columbus progeny were in excess of 2500 lbs per acre while that of a 9816-012 progeny exceeded 2800 lab per acre. In general, alpha acid yields were reduced relative to previous years. These accomplishments enable the production of new crosses to further the improvement of hop germplasm suitable for production in arid hop growing regions and provide new germplasm for identifying heritable sources of resistance to hop powdery mildew, high beta-acid content and dwarf growth habit. These cooperative studies will ultimately benefit growers, merchants and breweries in the USA.
The ADODR monitored the cooperator’s performance on this extramural agreement through site visits, meetings, email correspondence and review of data.