Microbe-Lift Liquid Biological Mosquito Control, 0.5 oz. For BirdBaths and other areas where water accumulates. Treats the average birdbath for up to 2 years. Controls Mosquito Larvae within 24 hous. Microbe-Lift BMC kills developing mosquitoes before they become breeding, biting adults, including those which may transmit West Nile Virus and Equine Encephalitis, and those which may transmit Heartworm Disease to dogs & cats. Microbe-Lift BMC can be applied to areas that can contain aquatic life, fish and plants. Microbe-Lift BMC can be applied to areas used by or in contact with humans, animals, horses, livestock, pets, birds, or wildlife.