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Thread: Wild yeast growth on fresh pitch (vermont ale?!)

  1. #1
    Join Date
    Mar 2017
    Location
    London
    Posts
    32

    Wild yeast growth on fresh pitch (vermont ale?!)

    Hello,

    we ordered a new pitch vermont ale and streaked it on our standard copper sulphate agar plates and saw growth on them (>50 cfu) some smaller, some bigger colonies but morphology all the same. The beer tastes fine and nothing unusual. Cells look like a normal brewing yeast under the microscope. We plated from the container the yeast was delivered in and from the tank which has been cleaned very thoroughly (rinse - caustic - rinse - pasteurised (30min 80C) - acid - sanitised)

    It is not some weird Belgium strain that might be resistant to copper sulphate. Maybe the concentration of the copper sulphate is too low in the agar?

    We have brewed with that strain before and always had clean plates.

    This is very strange.

    I hope someone can help out here.

    Matthias

  2. #2
    Join Date
    Oct 2012
    Location
    Palatine, IL
    Posts
    97
    Who was the supplier? There's a certain big name yeast supplier that is well known for having wild yeast, specifically diastaticus contamination.

  3. #3
    Join Date
    Apr 2014
    Location
    AUS
    Posts
    141
    Yeast Bay?

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