Willamette Rhizome

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Hop Qualities

Willamette Rhizome Flavor

Popular American development in 1976 of the English Fuggle. Named for the Willamette Valley, an important hop-growing area. It has a character similar to Fuggle, but is more fruity and has some floral notes. Used in British and American ales. A recent taste-test comparison between Ahtanum and Willamette has described some similarity between the varieties.(Reference)
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Hop Growers of America Information

Named after Oregon’s Willamette River, which runs through that state’s hop growing region, Willamette was released in 1976 from the U.S.D.A. breeding program. It is a daughter of the classic English variety, Fuggle, and is characterized by a low alpha content and mild aroma. Willamette is the most widely grown U.S. aroma hop. It imparts a mild, slightly spicy, and pleasant aroma in beer.
Commercial Examples:
American Pale and Brown Ales, English-style Ales
Acid Range (Alpha %)
4–6% 4–6%
Beta Range
30–35% of alpha acids
Total Oils
1–1.5 Mls. per 100 grams dried hops
30–40% of total oils
6.5–8.2% of total oils
20–27% of total oils
5–6% of total oils
Possible Substitutions
60% alpha acids remaining after 6 months storage at 20° C
1300–1700 kilos per hectare
1457.3–1905.7 kilos per hectare
lbs. per acre
Rhizome Growing Information
Moderate yielding, triploid hybrid of English Fuggle.

USDA Willamette Rhizome Information

SELECTION: Seedling selection No. 6761-117 of cross 6761 made at
Corvallis, Oregon in 1967.
GENUS: Humulus
SPECIES: lupulus
CULTIVAR: Willamette
PEDIGREE: Tetraploid Fuggle (USDA 21003) x Fuggle seedling 2-4
PRIMARY SITE: USDA World Hop Cultivar Collection, OSU East Farm
ORIGIN: Cross 6761 made in 1967 at Corvallis, Oregon
DATE RECEIVED: Selected and Accession Number assigned in 1971
METHOD RECEIVED: Seedling selection
AVAILABILITY: No restrictions, commercial cultivar
REFERENCES: Haunold, A., C. E. Homer, S. T. Likens, D. D. Roberts and C. E. Zimmermann. 1976. Registration of Willa-
mette Hop. Crop Sci. 16: 739.
Haunold, A., S. T. Likens, C. E. Homer, G. B. Nickerson and C. E. Zimmermann. 1977. Columbia and Willamette, two new aroma type hop varieties. Brewer’s Digest 52:36-39, 56.
LEAF COLOR: Dark green
SEX: Female
DISEASES: Downy Mildew: resistant
Verticillium Wilt: tolerant to moderately susceptible
Viruses: free of Prunus, Apple and Hop Mosaic Virus
VIGOR: Excellent
YIELD: Very good, 1700-2200 lbs/acre
SIDE ARM LENGTH: 24-40 inches
ALPHA ACIDS: 6.6% (10 year range: 5.2 to 11.1)
BETA ACIDS: 3.8% (10 year range: 2.9 to 5.0)
OIL: 0.8-1.2 ml/100 g. Humulene 21.2%; caryophyllene 7.4; myrcene 51.0%
Farnesene 5.0%. H/C ratio = 2.89
MAJOR TRAITS: Triploid (2n = 30), seedless even in the presence of
fertile males, high yield potential, Fuggle-type aroma profile.
OTHER INFORMATION: Used as Fuggle replacement by a major U.S. brewer.
Grown primarily in Oregon. 2100 acres grown in 1986
(mostly in Oregon) produced 3.4 million lbs (6.9% of
U.S. production). Major acreage expansion in 1987. In 1997 Willamette
ranked third in US hop acreage (7,578 acres) and produced 11.144 mill.lbs.

Product Tags: • Moderate Yield

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