USDA ACCESSION No.: 21279
SELECTION: selected in the late 1800s by Mr. Keyworth in England
CULTIVAR: Keyworths Midseason
PEDIGREE: no information available
PRIMARY SITE: USDA-OSU Hop Research Farm, East Farm, Corvallis, OR
ORIGIN: probably a mutant selected in an established commercial hop yard in England
DATE RECEIVED: spring 1980
METHOD RECEIVED: rhizomes
AVAILBILITY: no restrictions, commercial variety
REFERENCES: Burgess, A.H. Hops. Leonard Hill Books. New York and London. 1964.
Neve, R.A. Hops. 1991. Chapman and Hall, New York and London.
MATURITY: medium early
LEAF COLOR: light green
DISEASES: downy mildew: moderately resistant
Verticillium wilt: modrately resistant
Viruses: no information
VIGOR: good to very good
YIELD: good to very good, 1,500 to 2,200 lbs/acre in Corvallis test plots
SIDE ARM LENGTH: 18 to 30 inches
ALPHA ACIDS: 7.5%
BETA ACIDS: 3.1%
STORAGE STABILITY: fair to poor, retained about 49% of original alpha acids after 6 months room temperature storage
OIL: 0.89 ml/100 g. Humulene 13.4%; caryophyllene 10% myrcene 55.8%; farnesene trace.
MAJOR TRAITS: pleasant continental aroma, high yield potential
OTHER INFORMATION: used as an aroma hop primarily in England.