Mosquitoes are annoying to both man and beast. Some mosquitoes, however, can transmit diseases. Although the application of pesticides on lawns will kill mosquitoes, these agents can pose risks to human health and the environment. Some biological pest controls are safer than conventional pesticides, said the U.S. Environmental Protection Agency.
Botanical Controls: Volatile oils in some plants can repel and kill insects. Organic lawn and garden products formulated to counter mosquitoes often contain a combination of plant oils, including the essential oils of rosemary, thyme, peppermint, sesame, wintergreen and thyme
Microbial Pesticides:Microbial pesticides are naturally occurring microorganisms, such as fungi or bacteria. The most commonly-used microbial pesticide is Bacillus thuringiensis, each of which produces a unique combination of proteins that target and bind specifically to gut-receptor cells of mosquito larvae as they feed, causing them to starve.
Beneficial Insects: The praying mantis feeds on mosquitoes, as well as other common lawn and garden pests.
Bats: Another weapon in the war against mosquitoes on the ground is to fight from the air. Many of the more than 1,200 species of bats aggressively hunt flying insects.To employ bats as a natural mosquito control, you must purchase or build bat houses for them to roost in.
Source: http://greenliving.nationalgeographic.com/ecofriendly-mosquito-killer-lawn-3174.html