Strange yellow liquid on mushroom mycelium. What is it?

FAQ

🆘 Help! A strange yellow liquid appears on the mushroom mycelium
🆘 Why mycelium turned yellow?
🆘 Is it contamination?
🆘 What to do?

Mycelium pigmentation and transparent yellow liquid without odors is secondary metabolites (aka mushroom exudate, mushroom urea, mushroom piss). It is a waste product of fungal metabolism or mushroom exudate.

🔬 Biochemical analyses of the exudates showed that acid phosphatase, β-glucosidase, acid and alkaline protease, RNase polygalacturonase and cellulase enzymes as well as oxalic acid and ammonia were present.

It is not contamination! Metabolites are natural immune response of the mycelium to stress or pathogens (especially bacteria). 

🔴 Newbie cultivators often confuse secondary Metabolites with Mycogon (aka Wet Bubble) contamination or with Aspergillus yellow spp. (Aspergillus flavus).

✅ Let’s figure out how to distinguish metabolites, main causes and examples in the section Mycelium metabolites or mushroom pee
https://shroomok.com/
Check out our short videos with more examples:
Mushroom Metabolites | Growing mushroom troubleshooting
Yellow mold or mycelium pigmentation?

Have a Happy growing and Healthy Shrooms!
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