Mosquitoes and Mosquito Control

The mosquito-borne West Nile virus continues to be a growing health concern in the United States. In 2003, there were 9,377 reported cases of WNV human infection, and 244 human deaths with the virus reaching 46 states. In addition to West Nile virus, mosquitoes can transmit many other infectious agents to people and animals, such as heartworm disease in dogs and cats.

To kill existing populations of adult mosquitoes, use an adulticidal insecticide product outdoors. Since mosquitoes lay their eggs in stagnant or slowly moving water, you should try to eliminate any standing bodies of water in your yard. Water that remains should be treated with a mosquito larvicide to prevent the emergence of breeding, biting, adult mosquitoes. Areas that should be treated include bird baths, water gardens, ornamental fountains, animal watering troughs, flowerpots, tree holes, old tires, pool covers, urns, rain barrels, roof gutters, abandoned swimming pools, and any other water holding receptacle.

To prevent mosquito bites on people, use a repellent on skin and clothing containing DEET. Apply repellent sparingly to exposed skin. Do not use DEET on animals. The ASPCA Animal Poison Control Center reports that dogs and cats are very sensitive to DEET and may develop neurologic problems if DEET-containing products are applied to them. Dogs, cats, and horses can be protected against mosquito bites with a pyrethrin-based product. Dogs and horses may also be treated with a concentrated permethrin-based liquid topical. Never use a product containing concentrated permethrin on cats.

Additional Tips to Avoid and Control Mosquitoes

• Install or repair existing window screens

• Remove litter from your yard. Mosquitoes can lay eggs in small, discarded items that can hold water such as cans, bottles, and wrappers.

• Stay indoors between dusk and dawn when mosquitoes are more likely to bite

• Wear long-sleeved shirts, long pants, and socks for extra protection when going outdoors