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Green Mold (Trichoderma)
Trichoderma spp.
The most common and aggressive contaminant in mushroom cultivation. Once green spores appear, the battle is usually lost.
Reference Images
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What It Looks Like
Bright green patches that spread rapidly, often starting white then turning green
Recommended Action
Immediately isolate and dispose. Do not open indoors. Do not compost - bag and trash. Sanitize entire grow area.
How to Identify
- 1Starts as white fuzzy patches (looks like mycelium)
- 2Turns green within 24-48 hours
- 3Spreads extremely fast once green
- 4Has earthy/musty smell
- 5Green spores dust when touched
Common Causes
- •Incomplete sterilization of substrate
- •Contaminated spawn
- •Poor air filtration
- •Working in contaminated environment
- •Reusing contaminated materials
Prevention Tips
- ✓Proper sterilization (15+ PSI for 90 minutes)
- ✓Work in front of flow hood or still air box
- ✓Use quality spawn from reputable source
- ✓Sanitize all surfaces and tools
- ✓Never open colonizing bags unnecessarily
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