How do I stop my birdbath from producing mosquitoes?

Empty and clean by scrubbing birdbaths at least every three days. Chlorinating birdbaths can also help prevent mosquito breeding. Invasive Aedes mosquitoes can lay their eggs on the sides of the water in the birdbath and can remain dry, and viable, for up to a year. See Invasive Mosquito Species for more information about the invasive Aedes mosquitoes.