A 3-treatment program is designed to reduce the current population of mosquitoes and their larvae, as well as ticks.  The microcapsules are designed to be picked up by insects as they crawl over treated surfaces so they can be easily transferred and help control insects on contact.  The product adheres to insects and is easily passed to other insects for thorough control.  You must have trees and shrubs in your yard for us to spray the places that mosquitoes and other insects rest.  It does not get applied to the lawn.