I have a copy of, "The Peach, the Kansas Peach" published in 1899 by the KS State Horticultural Society, in it they have the following recommendation for dealing with borers on stone fruit trees.......make up a mixture (don't remember the ratios) of hydraulic cement and milk and paint it onto the trunk and limbs of the tree.

They found it to be effective and stayed put pretty good because of the casein in the milk added flexibility to the cement in the mix when it dried. A water and cement mixture was found to crack and fall off readily.

Apparently, peach production was pretty big in this state back in 1899, the leading county had appx. 181,000 bearing trees and appx. 48,000 non-bearing trees.

If you try it, let us all how well it works, I wouldn't start with an entire orchard, just a small trial patch to be safe.