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MasFina
Snow Shredder
Registered: 05/08/06
Posts: 788
Loc: Mountains
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Stamets recommends unpasteurized casing?
#6611659 - 02/26/07 06:35 AM (17 years, 1 month ago) |
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In Growing Gourmet and Medicinal Mushrooms 3rd edition Stamets says that "Visscher (1978) determined that pasteurization of the casing layer at 140* for 4 hours significantly retarded and reduced fruitings due to the loss of stimulatory bacteria, but did not prevent mushroom formation. Hence, high heat-treatment of casing soils is not recommended." This is in reference to the Portobello mushroom which seems to have the same growing parameters and substrate choice as psilocybes. What's the deal?
-------------------- A Good Substrate: Poo With Extras Good Liquid Culture, Step by Step Timer Modification PM me if you are interested in buying 140ml syringes. $6 each + $7 shipping
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Civ
Pinning
Registered: 10/14/04
Posts: 2,537
Loc: California
Last seen: 8 months, 15 days
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Re: Stamets recommends unpasteurized casing? [Re: MasFina]
#6611773 - 02/26/07 08:15 AM (17 years, 1 month ago) |
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Caseing itself, is an option, method of preparing is all optional...
If your growing ports- awesome. Drop some un-treated caseing layer on some of your INDOOR cubensis substrates and tell me what happens
Edited by Civ (02/26/07 08:16 AM)
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MasFina
Snow Shredder
Registered: 05/08/06
Posts: 788
Loc: Mountains
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Re: Stamets recommends unpasteurized casing? [Re: Civ]
#6611783 - 02/26/07 08:18 AM (17 years, 1 month ago) |
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not ports, was only looking at them because it lacks a psilocybe section and ports grow on the same stuff. Casing is such a mysterious thing. There seems to be 1000 ways to do it, but no one knows which way is best. Someone give me the magic formula please.
-------------------- A Good Substrate: Poo With Extras Good Liquid Culture, Step by Step Timer Modification PM me if you are interested in buying 140ml syringes. $6 each + $7 shipping
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RogerRabbit
Bans for Pleasure
Registered: 03/26/03
Posts: 42,214
Loc: Seattle
Last seen: 1 year, 1 month
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Re: Stamets recommends unpasteurized casing? [Re: MasFina]
#6612062 - 02/26/07 10:33 AM (17 years, 1 month ago) |
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I've been saying unpasteurized casing material works better for years, but it's heresy around the OMC where half the growers PC their casing material. Chances of Dactylium mold contamination are higher with an untreated casing layer, but if one can manage proper air exchange, results are superior, ESPECIALLY with cubensis. RR
-------------------- Download Let's Grow Mushrooms semper in excretia sumus solim profundum variat "I've never had a failed experiment. I've only discovered 10,000 methods which do not work." Thomas Edison
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MasFina
Snow Shredder
Registered: 05/08/06
Posts: 788
Loc: Mountains
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Re: Stamets recommends unpasteurized casing? [Re: RogerRabbit]
#6612373 - 02/26/07 12:29 PM (17 years, 1 month ago) |
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Well if both you and Stamets agree then I'm sold. Thanks
-------------------- A Good Substrate: Poo With Extras Good Liquid Culture, Step by Step Timer Modification PM me if you are interested in buying 140ml syringes. $6 each + $7 shipping
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agar
old hand
Registered: 11/21/04
Posts: 9,056
Loc: Somewhere Else
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Re: Stamets recommends unpasteurized casing? [Re: MasFina]
#6614991 - 02/26/07 11:23 PM (17 years, 1 month ago) |
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Agaricus bisporus REQUIRE a casing cover, that has specific physical, chemical and microbiological properties which stimulate and promote the initiation of primordia.
Without that, Agaricus bisporus don't pin or fruit well.
P. Cubensis has no such "casing" requirement.
Given decent conditions; They pin/fruit well, with or without a casing layer.
In my opinion, they are far more productive. With a casing layer.
The object of heat treating casing material, is to limit, or kill; Possible pests, gnats, larva and molds that may be in the casing material.
I have found that a vermiculite/perlite mixture. 50/50, 60/40, 70/30 or anything near that. (vermiculite being the front # in each) Will work fine, as a casing layer for P. Cubensis. Neither of which is known to harbor pest/contaminates. Because of the way they are produced; Via extremely high temperature heat treatment.
Confusion between the fruiting requirements, between P. Cubensis & Agaricus bisporus are the cause.
Given that P. Cubensis have no requirement, for a casing layer. It matter not (my opinion) if the casing material is; Not pasteurized, pasteurized, or even sterilized.
However, for the sake of killing pests & whatever else HEAT KILLS. I nuke my casing material, repeatedly. (in plastic bags, sealed semi-close with a rubber band)
Others may "cringe" at the technique. But, it works for me.
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Blutjager
Inhuman
Registered: 06/11/06
Posts: 9,220
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Re: Stamets recommends unpasteurized casing? [Re: agar]
#6615168 - 02/27/07 12:17 AM (17 years, 1 month ago) |
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I always pasteurize,I like the idea of killing any foreign mold spores that my be in the bag when I buy it(I use nothing but MGMC)
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