My Dreadful experience is only with Meadow Voles.
I consider myself fortunate.
They girdled 24 of 100 trees in 2005. I replanted at great expense /
education!
Spiral wraps on baby trees, aluminum window screen on adolescent trees has
worked 100%.
My placement of 1 bait block per tree has also yielded a decent 'crop' of
Voles each Spring....
When you mow your orchard, start with the outer perimeter and work inward.
Find a Jack Russel terrier to assist you, and he'll finish the job!
Guaranteed!
Ours; we quit counting at 25! One acre.