Mosquitoes spread disease such as Malaria and dengue fever. Mosquitoes also transmit the organism associated with dog heartworm.
Their biting causes irritation to humans and livestock. Mosquitoes breed in water, such as ponds and water trays on pot plants. In the summer months their population can grow quickly.
Flies can be a nuisance when buzzing around the home, some species of flies also pose a health risk, they can transmit a wide range of disease causing microbes including those responsible for food poisoning, dysentery and parasitic worm infections.