you are killing only the females. each female you kill will not lay
eggs that will hatch into thousands of mosquitoes. this is why the
magnet must be turned on BEFORE the mosquitoes start buzzing around.
and yes, there will be a time when they will be few and far between.
just6 to be sure, dig a pond, put in fish that eat mosquitoes. that
way what you miss will also be a dead end. Ingrid