In most cases it will not. Once the product has dried (normally 1 hour on a sunny day), it will bind with the foliage and continue to work until we return for the next scheduled service. Treatments are also applied under the foliage which aid in reducing washout.
If heavy or prolonged rains are expected on the day of your scheduled service, we will hold off the treatment to the next favorable day. If weather does become an issue, keep in mind that our service includes a callback warranty if you still see mosquitoes after any service.