The County Vector Control will use a helicopter to apply mosquito larvicide to local wetlands to reduce mosquito breeding and the risk of West Nile virus. Controlling mosquito breeding is essential in preventing the spread of West Nile virus. The aerial applications will occur monthly at numerous key breeding areas during the mosquito breeding season. They state that "the larvicide is not toxic to humans and does not pose a risk to wildlife or the environment." Of course, not everyone accepts such a benign assessment. Aerial applications are planned every four weeks until the weather cools. So far this year, in San Diego County, 8 humans, 88 birds, 4 horses, 1 sentinel chicken, and 2 mosquito pools have tested positive for West Nile virus.
