I'm not sure how the mycelium would like it, but if you briefly freeze your bags it will kill the sprouts. An imitation of a heavy frost.
I'm not a cultivator, but I notice vigour in wild fungi when the soil's warming, after a frost.
Thanks for agreeing, however:
Even though I'm 100% Australian, the Austrian in me asks why? What is funny about this? Please explain the humour? We Austrian's know humour, and this is not funny...
Upside-down text for comments/replies with even the vaguest connection to Australia.
Also, the "everything in Australia will kill you" meme has been done to death...