Good afternoon Today I completed your one time service call for yellow jackets I applied a liquid treatment to both of the openings, where yellow jackets were observed, flying in and out of the exterior of the home. The liquid treatment is a non-repellent and may take up to five days or less to be fully effective. Suggestion once yellow jacket activity has ceased, I would suggest filling those voids as soon as possible. If you have any other questions or pest concerns, please give us a call. Have a good day and thank you for choosing Green Pest Solutions.