Dunno but If it is insects of any kind you can kill 'em using Boric Acid dissolved in water. Hose the wood down with a strong solution and any bugs that get it inside 'em will die.Any ideas what critters are making these holes?
Tobacco offends rodents.Copenhagen
Used to offend my wife too! That is until I quit.Tobacco offends rodents.
Images of Elmer Fudd chasing a fly around his house with a shotgun come to mind.Also, I broke a couple of boards next to the holes, and nothing is under there.