I hired Viking Pest Control to eliminate a large yellow jacket infestation that was under the siding and in the wall of my tool shed. Dan came down the same day I contacted Viking and "dusted" all around the entrance holes in siding. He explained that if I still saw bees in 3 days to call Viking back. Three days later there were still some bees and Viking sent Travis down to re-dust. Both Dan and Travis did excellent jobs. Now, over a week later, there are no yellow jackets in site.