White Labs Launches STA1 Negative Saison Strain

SAN DIEGO (February 17, 2020) – Global liquid yeast and fermentation company, White Labs, is launching a new STA1 negative saison Vault Strain—WLP561 Non STA1son Ale Yeast. The strain is a blend of two STA1 negative strains that produce a saison-like fermentation profile with medium-to-light phenolic characteristics depending on the fermentation temperature.

“Many breweries got a scare due to recent genetic findings that some of the long-proven traditional strains carry the STA1 gene,” said Troels Prahl, vice president of innovation & European operations at White Labs. “The STA1 gene can in some cases be related to enzymatic activity with the release of fermentable sugars post the mashing process with hyper-attenuation as a result, which is not always wanted.”

Adding this strain to their offerings allows breweries to make saison-style beers without introducing STA1 strains into their brewhouse, which some breweries like to exclude from their facility to minimize the risk of cross-contamination between beers sharing the same equipment from one batch to another.


  • Style Recommendation: Specialty Belgian

  • Alcohol Tolerance: High (10-15%)

  • Attenuation: 78-85%

  • Flocculation: Low

  • Optimum Fermentation Temperature: 68-78℉ (20-26℃) 

  • Strain description: This blend of STA1 negative strains produces a complex expression of esters and phenols great for saison and farmhouse-style beers without the potential for super-attenuation commonly associated with many Belgian-style strains. White Labs Brewing Co. commercial trials and sensory panel identified fruit-like notes from this strain ranging from lemon and tropical fruit to chamomile, as well as an array of spice-like phenolic driven aromas like pepper, clove, and coriander.

WLP561 Non STA1son Ale Yeast is being released through the White Labs Vault. To learn more about Saccharomyces cerevisiae var. diastaticus, visit whitelabs.com/diastaticus

About White Labs

White Labs Inc. is an international company headquartered in San Diego that provides liquid yeast, fermentation products, services, analysis and education to professionals and enthusiasts alike. Continually raising the bar in the art of fermentation, White Labs stretches the limits of science to set new standards in purity and freshness. From the industry’s first pitchable liquid yeast to a complete revolution in the way it’s propagated and packaged, the White Labs innovative spirit is tireless.

Megan Joseph
Marketing Communications Specialist
Phone: 858.527.7380
Email: [email protected]

Monday, February 17, 2020
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