Development and Evaluation of Hop Germplasm for the Washington State Hop Growing Region
Forage Seed and Cereal Research
2012 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.
Research collaboration with Washington State University (WSU) enabled the evaluation of new crosses focused upon powdery mildew resistance within the semi-arid production conditions of central Washington. This important work was performed to address parent project goals of “Develop germplasm with improved agronomic characteristics and brewing quality with combined resistance to two fungal pathogens using traditional breeding procedures”. Twelve (12) crosses were made in 2011. From these crosses, 4000 seedlings were selected for off-station nursery evaluations. Fifteen new crosses were made in 2012 for new evaluations that will be planted and observed in 2013. Selections of previously developed germplasm showing high levels of resistance to powdery mildew, superior yield and brewing quality were made in 2012 with superior lines advanced to multi-hill plots on off-station farm plots. In addition, WSU facilitated observations of USDA-ARS developed advanced germplasm on-station and provided data to USDA-ARS scientists. WSU evaluated 719 USDA-ARS experimental germplasm accessions for yield, vigor, and disease-resistance. Of these accessions, 137 accessions were analyzed for brewing chemistry potential. Continued cooperative work with WSU is vital for the U.S. hop industry as almost 75% of the industry is centered under semi-arid production conditions.