USDA ACCESSION NO.: 21214
SELECTION: Clonal selection from the medium-early Zatecky krajovy, probably a Saazer-derived clone
PEDIGREE: Unknown, probably closely related to Saazer (USDA 21077); name derived from the village of Sirzem where it is grown commercially
PRIMARY SITE: USDA-ARS World Hop Cultivar Collection, OSU East Farm
ORIGIN: Hop Research Institute Zalec, Yugoslavia
DATE RECEIVED: Spring 1979
METHOD RECEIVED: Rhizomes
AVAILABILITY: No restrictions
REFERENCES: USDA Annual Report of Hop Investigations for 1979, p. 40 41.
USDA Annual Report of Hop Investigations for 1988, p. 35.
Rybacek, Vaclav. Hop Production (Developments in Crop Science 16). Elsevier Publishing Company, Amsterdam, New York. 1991. P. 76, 76.
Wagner, T. Gene Pools of Hop Countries. Institute for Hop Research, Zalec, July 1978, p. 69.
LEAF COLOR: Dark green
DISEASES: Downy Mildew: moderately susceptible
Verticillium wilt: unknown
Viruses: infected with all five hop viruses
YIELD: Poor (about 200 lbs/acre in Corvallis test plots; probably higher in Czechoslovakia where it is better adapted)
SIDEARM LENGTH: 6-10 inches, plants frequently fail to reach the top of the trellis (18 ft.)
ALPHA ACIDS: 3.5%
BETA ACIDS: 3.1%
STORAGE STABILITY: Fair, retained 57% of original alpha acids after 6 months room temperature
OIL: 0.47 ml/100 g, H/C ratio = 3.70, high in humulene
MAJOR TRAITS: Pleasant noble aroma, suitable for the production of super-premium beers, in particular Pilsener beer, mild bitterness; reddish stems.
OTHER INFORMATION: Grown on limited acreage in Czechoslovakia, exported and handled by the hop trade under the collective name Saazer or Bohemian Red hop. Also sometimes called Aurum; named after the village Sirem.