Three of four stages are aquatic. Click through each to see why dumping standing water every 7 days beats spraying — and where Bti larvicide fits in.
Eliminate these common breeding sites weekly — each one can produce hundreds of mosquitoes:
Aedes mosquitoes breed in as little as 1 tablespoon of water
Mosquitoes undergo complete metamorphosis with four life stages: egg, larva, pupa, and adult. The critical insight is that the first three stages are entirely aquatic — mosquitoes cannot reproduce without standing water. This biological requirement makes source reduction (eliminating standing water) the single most effective control strategy, surpassing all chemical methods combined.
Egg-laying strategies differ by genus. Culex mosquitoes (the primary West Nile virus vector) lay egg rafts directly on the water surface — floating clusters of 100–300 eggs that hatch within 1–3 days. Aedes mosquitoes (tiger mosquitoes, Zika/dengue vectors) lay individual eggs on container walls just above the waterline, where they can survive dry conditions for months and hatch when rising water finally submerges them. This drought tolerance makes container-breeding Aedes species particularly difficult to control.
Larvae (called "wigglers") pass through 4 instars over 4–10 days, feeding on microorganisms and organic matter in the water. They breathe at the surface through a siphon tube — which is why oil films and Bti larvicides that disrupt surface feeding are so effective. The pupal stage ("tumblers") lasts 1–4 days and does not feed. Pupae are mobile and can dive to escape threats, but they must return to the surface to breathe. Adults emerge from the pupal case at the water surface and are ready to fly within hours.
An integrated mosquito management program combines source reduction (weekly property walks to dump standing water), larviciding (Bti Mosquito Dunks in water that can't be drained), barrier sprays (bifenthrin on vegetation where adults rest), and personal protection (DEET, picaridin, or permethrin-treated clothing). This layered approach addresses every life stage and reduces populations far more effectively than any single method.
7–14 days in warm conditions. Standing water left for just one week can produce a new generation of mosquitoes.
Three of four mosquito stages are aquatic. Eliminating standing water destroys all three simultaneously. Adulticiding sprays only kill flying adults — a fraction of the total population.
Aedes mosquitoes can breed in as little as one tablespoon of water — bottle caps, plant saucers, and tire treads are all viable breeding sites.
Bti is a soil bacterium whose proteins destroy mosquito larval gut lining within 24 hours. It's non-toxic to humans, pets, fish, birds, and beneficial insects. Dunks release Bti for 30 days in water that can't be drained.
All lifecycle data, species biology, and control recommendations verified against CDC guidelines, university extension resources, and professional field outcomes.