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Offlinetyga772
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Registered: 05/17/23
Posts: 309
Last seen: 1 day, 18 hours
cause for yellow mycelium?
    #28395855 - 07/14/23 09:59 PM (1 year, 6 months ago)



This is my first grow and i have a greenhouse that i am still working on tuning in. i know a greenhouse should not have been my first choice for growing since it is somewhat more complicated then a neglect tek, but i did it anyways. i introduced to fruiting july 7 and have just started seeing pins. i also noticed that the top left section of my mycelium is turning yellowish. i have heard this could mean it is too dry or too wet, along with the possibility of contam. my greenhouse fluctuates from 60% rh to 95% mostly staying near the middle/higher of that range. i also mist 2-3 times a day but there is always little beads of water, never pools. i can’t see how it would be dry or wet, but that’s why i’m asking you guys. any suggestions or thoughts would be appreciated.

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OfflinePBJ710
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Re: cause for yellow mycelium? [Re: tyga772]
    #28395867 - 07/14/23 10:18 PM (1 year, 6 months ago)

If you need to mist it 2-3x a day to retain surface conditions, that should be a huge indicator of whats going wrong.  Cubes don't need massive amounts of fresh air.

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Offlinetyga772
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Registered: 05/17/23
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Re: cause for yellow mycelium? [Re: PBJ710]
    #28395871 - 07/14/23 10:37 PM (1 year, 6 months ago)

ok i have reduced the amount of air flow and will see how the new setting affect the grow. thank you for the input. another question though: if i maintain a rh of 99%, which is almost hard to avoid without excessive fae, and cut out most of the misting, would this fix the problem or just over saturate the substrate?

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OfflinePBJ710
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Re: cause for yellow mycelium? [Re: tyga772] * 1
    #28395884 - 07/14/23 11:21 PM (1 year, 6 months ago)

Everyone's unique environment will require dialing it, but there is a balance.  You need enough air to keep them from getting elongated furry stipes with tiny heads, but it really doesn't take alot FAE to achieve that for cubes.  Unmodified shoeboxes are often fruited with the lids snapped on only using the 1-2mm gap under the lid for FAE and EZDial tubs only use a few 1/4" holes on the ends of 66qt tubs to achieve FAE - both only using passive room air for FAE.  You don't need to choke them out, but a martha can easily provide too much dry air and strip the moisture from substrates.

Don't trust the RH% numbers - cheap/digital hygrometers are often not capable of accurately reading 95%+ humidity.  Just watch the surface conditions and it will show you whats needed if anything.

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InvisibleGoatrider
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Registered: 04/08/20
Posts: 4,801
Loc: Germany
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Re: cause for yellow mycelium? [Re: PBJ710] * 1
    #28395952 - 07/15/23 02:54 AM (1 year, 6 months ago)

:whathesaid:

Even for pans i don´t use analog hygrometers.
Your eyes will become the ultimate weapon with experience.
Just keep this up until pins move in,
dial in for a bit air exchange (all related to your environment, like PBJ said),
and you´re set.
Don´t overthink this "cubensis needs science" thing,
they´re no gourmets and don´t need specific greenhouses/automations.
Just clean spawn, moisture, and some passive airflow.
In addition to this patience is the hardest part :grin:

          :cookiemonster:


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