The rhizomes spread from a 'home base', usually a dead tree or an infected living plant and don't survive once broken, so regular fairly deep cultivation of the soil between a known source and prized woody plants will limit the spread, as will a barrier, if you can't access and remove the source (an old Ash tree stump, next door, in my case.) I've noticed the fruiting bodies can pop-up anywhere, but especially where the 'seeking' rhizomes hit impenetrable barriers, such as walls or some of my paths which have fairly deep foundations.
Very interesting. You therefore need to be very vigilant about removing all the fruiting bodies before they release their spores.
As I understand it, the main way it spreads is via rhizomes through the soil, and infection by spores is thought to be a vanishingly small method of it spreading. If spores were a real problem, the stuff would be everywhere.
A trowel in the hand is worth a thousand lost under a bush.
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