USDA ACCESSION NO.: 21214

SELECTION: Clonal selection from the medium-early Zatecky krajovy, probably a Saazer-derived clone

GENUS: Humulus

SPECIES: lupulus

CULTIVAR: Sirem

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.

MATURITY: Early

LEAF COLOR: Dark green

SEX: Female

DISEASES: Downy Mildew: moderately susceptible

Verticillium wilt: unknown

Viruses: infected with all five hop viruses

VIGOR: Poor

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%

COHUMULONE: 23%

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.

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