Good evening, it was nice meeting you today! I completed your one time bee service today. I treated the yellow jacket nest in the barn with a liquid residual. I also used an aerosol spray to knock down any swarming yellow jackets. Please allow five to seven days for full effect of treatment. If you continue to see bee activity after one week, or if you have any questions or concerns, please give us a call. Thank you for choosing Green Pest Solutions!