🚀 go-pugleaf

Here in NZ they have a insect attractant trap which they claim will
attract mosquitoes. It uses a liquid which also attracts flies and wasps,
so I have my doubts. As our Summer is just starting, I will give it a try.

I recall an anecdote which may give you some where to start.  Years ago I
was told of an accident where a load of dry ice was spilt.  In the
morning, the dry ice had attracted and killed hords of mosquitoes. And I
think it is true that these insects are attracted to the carbon dioxide
in our exhaled breath.
I would also try sweat and some human exhale concentrate (exhale into a
cigarette filter for example). Tsetse flies are attracted to the the
exhelate of animals, and distillates of this stuff are used to attract
them to traps.

I think you will have a real challenge, for if a mosquito killer were
available, half the world would want one. 
arnold