Here's what I learned that changed everything.
Voles are essentially blind.
Their entire world is vibration.
They navigate underground by feeling seismic signals through the soil. They find food by vibration. They choose safe territory by vibration.
Quiet soil means safe soil to a vole.
Every spray I used, every trap, every bait station none of it touched the soil vibrations.
The ground stayed quiet. The voles stayed put.
Remove a vole, another moves in within weeks. The territory still feels safe. The vacancy fills automatically.
That's why the pest control man said "management."
Because his methods never changed the one thing voles actually respond to.
But here's what does work:
Constant low-frequency vibration pulsing through the ground. 24 hours a day. 7 days a week.
Voles can't navigate. Can't maintain their runways. Can't feel safe.
So they leave. And new ones can't move in.
Not management. A permanent change to the underground environment itself.