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Yellowing of substrate surface? Uncased tubs in greenhouse (pictures)

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#1 btb103



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Posted 25 October 2008 - 01:03 PM

Last week I moved three fully colonized, uncased Z-strain coir-castings tubs into my greenhouse. I've been having a lot of trouble lately dialing in my greenhouse and am getting really frustrated by it.

I'm using a Vicks V420 for the first time and am finding it a lot different from my previous wick-based humidifier. The surface of my substrate is beginning to yellow, and areas of condensation on the greenhouse walls are also yellowing. The substrate in general looks unhealthy and perhaps overlayed. It's been seven days and there are no signs of primordia or pins. A monotub of the same strain that I began fruiting at the same time is already pinning.

First of all, what could be causing the mycelium to turn yellow? What property of my water would be causing that and is it damaging to the mycelium?

Second of all, what causes overlay, exactly? The edge of my monotub that receives airflow from a circulating fan in the room also shows the same kind of growth so I feel it may have something to do with drying out or something. But I've also maintained 90+% humidity so I don't know. I decided to go uncased this time around for simplicity's sake but it seems to be more sensitive.

Here are some photos:
Tub 1

Tub 2

Tub 3 looks like tub 2.


#2 golly



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Posted 25 October 2008 - 01:21 PM

Tub 1 seems to be bluing from low rh..
Use low mineral water in humidifiers ,as they can leave a residue everywhere ,although it's usually a white powder [calcium] ..Try a diff water source...

#3 Dr_T


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Posted 25 October 2008 - 08:44 PM

Drying out, IMO.

Overlay is caused by too-rich conditions- the myc keeps vegetating instead of switching to fruiting mode. And that may be too overlaid and too dried to really salvage. You might try a little scratching- not big furrows, just ruffle it a bit. Then let it re-knit for a couple of days, and re-induce pinning. Temp, light, humidity, FAE- all at once.

#4 btb103



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Posted 25 October 2008 - 09:23 PM

Thanks for the replies, guys. I'm dunking them over night and then will re-initiate pinning. Maybe do a little scraping. Here's to hopin.

#5 Dr_T


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Posted 25 October 2008 - 09:32 PM

Yep, a good dunk is the first step.
Good luck!

Edit- y'know, you might try casing after the dunk. Just a thought.

#6 mushhut



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Posted 26 October 2008 - 09:15 AM

I've had some subs in the past yellow on me like that, I just left em a perfect conditions 85 to 90% hum and 72 to 76 deg temps. My yellowing tubs fruited in 15 or so days. Id say, just leave em if conditions are perfect. Dunk after first flush.

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