Sep 15, 2017
The Marin/Sonoma Mosquito & Vector Control District (District) announced today that a group of mosquitoes tested positive forWest Nile virus(WNv) in Sonoma County. The WNv positive mosquitoes were collected in the vicinity of Wilfred Avenue and Whistler Avenue in Rohnert Park.
Which mosquito repellents work best? CDC recommends the use of products containing active ingredients which have been registered with the U.S. Environmental Protection Agency (EPA) for use as repellents applied to skin and clothing.Of the products registered with the EPA, those containing DEET, picaridin, IR3535, and some oil of lemon eucalyptus and para-menthane-diol products provide longer-lasting protection.EPA registration means that EPA does not expect the product to cause adverse effects to human health or the environment when used according to the label.
Mosquitoes are small, blood-feeding flies (Order: Diptera, Family: Culicidae). Most species are only 1/8 - 1/4” long. Adult mosquitoes have two wings and a long needle-like mouth (called a proboscis). Immature stages of mosquitoes are aquatic and do not resemble the adults. Mosquito larvae are elongated and often have a long respiratory siphon, while pupae are comma-shaped and have two smaller breathing tubes.
Mosquitoes develop in a wide range of aquatic habitats; please view our Mosquito Production Sources Gallery to see a variety of places where mosquitoes commonly lay their eggs. Some species of mosquitoes lay large numbers of eggs directly onto standing water, while others deposit eggs in areas that periodically flood. Mosquitoes progress through four life stages: egg, larva, pupa and adult. Aquatic mosquito larvae hatch from eggs and develop into pupae. The pupae emerge from the water as adults. Warm temperatures generally encourage faster development, with some mosquitoes developing from egg to adult in approximately one week. Please see our Mosquito Life Cycle Gallery to see pictures of all life stages of mosquitoes.
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