Miami-Dade County began spraying the pesticide naled last week. The Centers for Disease Control and Prevention has recommended using both pesticide sprays that kill adult mosquitoes and larvicides that kill newly hatched insects, as well as low-tech mosquito control efforts such as dumping standing water.
Opponents of spraying say they are afraid for their own health, the health of children and the pesticide's effects on bees and marine life. Naled can kill most flying insects and can be toxic to aquatic life. In large doses, it can sicken people.