Comment by bjackman

Some species of mosquitoes are able to survive their egg site drying out for quite some time. They go dormant and then hatch when they are rehydrated.

I believe this is quite dependent on the timing in the lifecycle though so maybe there's a design for this that works regardless, just by getting the periodicity right.

Edit: ah no, according to AI, the window before they become dessication-resistand is very short.

However, another idea (actually even simpler, no moving parts): a UV lamp that turns on for an hour every day would probably kill them pretty dead!