Breeding sites, not adults
An adult mosquito is the end of a process that started in standing water seven to ten days earlier. Fogging kills the adults present at that moment and nothing else, so a site fogged on Monday with breeding untouched has mosquitoes again by the weekend. The work that changes the population is finding and removing the water.
The sites are smaller than people expect. A saucer under a plant pot, a blocked roof gutter, an air conditioning condensate tray, a disused bucket, a pool cover holding rain, a manhole with a cracked seal, a water feature that has stopped circulating. Several species here breed happily in a container the size of a teacup, which is why a survey walks the plot rather than treating a boundary.

