The most efficient method is to engineer a gene that make the mosquitoes that only produce male sperm. (Harder than engineering sterility, but there are many models to copy.) This might require only a single release. By the time it was noticed it would be a fait accompli.
So do, some don’t. The first hit on google for mosquito sex determination says that a particular malaria mosquito does. The second talks about diversity.
The most efficient method is to engineer a gene that make the mosquitoes that only produce male sperm. (Harder than engineering sterility, but there are many models to copy.) This might require only a single release. By the time it was noticed it would be a fait accompli.
Do mosquitoes even use an XY sex determination system?
So do, some don’t. The first hit on google for mosquito sex determination says that a particular malaria mosquito does. The second talks about diversity.