Ticks, mosquitoes, flies, cockroaches, rats… and pest control.

Under my humble opinion, the best way to eradicate all these plagues, that so much bad do to humans, pets and wild animals, is to genetically modify those insects, arachnids and rodents in order to generate females that only breed females, that in turn will only breed females as well. In a few cycles the total number of their population will diminish notably, and eventually they could disappear in many parts of the World.