The only effect that rain has on our applications is delay or cancellation of the application. Rain just before or after an application does not have a major effect on the success of the treatment. The products we use are oil based, and are not “washed off” by the rain. In fact, we are not treating foliage, but spraying in the air while mosquitoes are flying, impacting them at that time. The products we use are non-residual and dissipate quickly in the environment anyway. We are not applying a product that is necessary for the mosquito to come in contact with hours or days later like most treatments done by private applicators.