Borers- treatment options

[stuckinthemud]

I have a 4 inch diameter prunus (plum) stem, 5 ft in length. When I stripped off the bark I found the cambium and sapwood has been almost entirely eaten by borers, though they have left most of the heartwood alone
What should I do beyond removing the affected timber?

 

[topchippyles]

Cut it down would be the best option

 

[stuckinthemud]

Sorry for my poor description; the tree was felled last Autumn, I collected it today and just started roughing it out.

 

[stuckinthemud]

Ok, so having removed the bark and rasped off the sapwood, are there any remedies I can apply that won't stain the wood and won't damage me as I will eventually be hand-carving the wood so contact insecticides are a bit of a no-no. I was wondering about coffee or vinegar or salt solution but I imagine they will all stain the timber and not impact any eggs/lavae that may be present??