Today I completed your one time service for Yellowjackets. A liquid residual treatment was applied to area where Yellowjackets are nesting on back step. This area where top patio step meets the doorway of your sunroom May still be active for the next few days. Allow 3-7 days to see a decrease in activity. After 10-14 days if activity does not decrease contact our office for a follow up visit. Thank you for choosing Green Pest Solutions and have a great day.