Mosquito spray includes repellants and poisons to kill the mosquito. The chemicals are highly toxic for the insect but not so toxic for humans.
Sometimes. A mosquito killer may be a larger mosquito who kills smaller ones, or otherwise could be another bug, bird, ect. that just finds mosquitos tasty.
insectisides,pesticides,chemicals like ddt etc. kill mosquitoes
you squash it
By using mechanical methods such as hand or fly swatter By using chemical methods such as instectides By using electrical methods such as Bug Zappers