Sterilization Methods for Mushroom Cultivation

Tue, 10 Mar 2026 00:00:00 +0000

Look, sterilisation isn’t optional. It eliminates ALL viable organisms from a substrate. Unlike pasteurisation which just reduces them (big difference). Critical for grain spawn, agar, and supplemented substrates.

Ever tried running a grow room without proper sterilisation? Yeah, doesn’t go well. You’ll spend weeks waiting for mycelium only to watch green mould take over. Honestly, it’s gutting.

Principles of Thermal Sterilisation

Moist heat at 121C (15 PSI) denatures proteins and nucleic acids including Bacillus and Clostridium endospores. Boiling (100C) isn’t enough. Endospores survive hours of boiling. D-value for B. stearothermophilus at 121C is 1.5-2.0 minutes. 15 min at 121C achieves 10^-6 sterility assurance. But the entire substrate must reach 121C.

Pressure Cooking on Mushroom Substrate Science

Sterilization Methods for Mushroom Cultivation

Principles of Thermal Sterilisation