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JCNYC
Stranger

Registered: 04/19/12
Posts: 24
Last seen: 9 years, 5 months
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Is this yeast contamination?
#16543755 - 07/17/12 09:28 AM (12 years, 6 months ago) |
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Hello everyone, I am having trouble with what I think is a yeast contam on my grain spawn (pleurotus ostreatus). I am working in front of a flow hood and following all the sterile procedures suggested by trusted cultivators on these forums and other books.


The first image is an earlier batch that I set aside because it looked contaminated. The second image is a new jar made from what I thought was a contam-free agar plate (I did a couple of transfers on MYPA). I have simultaneously been working with other species and not encountered this problem.
Am i misdiagnosing this problem? Is this not yeast contam?
Thanks for the help!
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TheEaglesGift
The Nagual


Registered: 04/10/11
Posts: 10,554
Loc: Ixtlan, Mexico
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Re: Is this yeast contamination? [Re: JCNYC]
#16544526 - 07/17/12 12:55 PM (12 years, 6 months ago) |
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The first photo certainly looks like yeast. I'm not sure about the second photo.
What species of mushrooms is this?
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JCNYC
Stranger

Registered: 04/19/12
Posts: 24
Last seen: 9 years, 5 months
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This is oyster (pleurotus ostreatus). I made six jars and only one became stinky and weird-looking, the others fully colonized; however, i am not sure if they will be ok to use in fruiting substrate.
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x7x_x7x
x7x+, my problem grandchild.




Registered: 05/05/07
Posts: 3,889
Loc: buenos aires
Last seen: 1 day, 14 hours
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Re: Is this yeast contamination? [Re: JCNYC]
#16567662 - 07/22/12 11:22 AM (12 years, 5 months ago) |
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Quote:
JCNYC said: Hello everyone, I am having trouble with what I think is a yeast contam on my grain spawn (pleurotus ostreatus). I am working in front of a flow hood and following all the sterile procedures suggested by trusted cultivators on these forums and other books.


The first image is an earlier batch that I set aside because it looked contaminated. The second image is a new jar made from what I thought was a contam-free agar plate (I did a couple of transfers on MYPA). I have simultaneously been working with other species and not encountered this problem.
Am i misdiagnosing this problem? Is this not yeast contam?
Thanks for the help!
little white spots are contaminants
-------------------- cultivando en la miseria SuctoSpore® Pictorial Tek

x7x_x7x@shroomery.org carl_jung_in_lsd@yahoo.com koh samui and oak ridge are my favourite strains
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Krumm


Registered: 02/17/19
Posts: 4
Last seen: 5 years, 6 months
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Re: Is this yeast contamination? [Re: JCNYC]
#25952404 - 04/24/19 08:28 AM (5 years, 8 months ago) |
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I see the same with my oyster rye grain spawns. I already fruited them and ate without seeing any color change or nasty smell. I believe it is calcium precipitation. If my rye grains are a little on the dry side, I do not see the same white spots. What do you thinK?
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