I have a very large customer that has a major vole problem. I've never seen a vole, never killed a vole, never smelled a vole, you get the picture. I do have a pest and rodent control license. From what I have researched, it seems as though zinc phosphide baits are the best source of control. Would you agree with this? The customer wants to spray to kill the grubs, thinking that getting rid of the grubs will help get rid of the voles. Agree or disagree? This is a 6 acre property by the way, which is not used to paying for grub control as it is not that common in our area. Any advice would be appreciated.