I have dusted holes with Delta and it works but I was told about a different way.
Melt Vaseline and mix Permethrin in it. Pull it up in syringes and let it cool. Squirt a little in any bee hole you find and it rubs on em and kills em. It kills any that come along later and any young when they hatch. I was told to treat monthly in the summer and to squirt a garden pea size dollop into the hole.
Will update. I am waiting for it to cool. 2 tablespoons in a full large Vaseline container.
Melt Vaseline and mix Permethrin in it. Pull it up in syringes and let it cool. Squirt a little in any bee hole you find and it rubs on em and kills em. It kills any that come along later and any young when they hatch. I was told to treat monthly in the summer and to squirt a garden pea size dollop into the hole.
Will update. I am waiting for it to cool. 2 tablespoons in a full large Vaseline container.