Chemical control involves the use of EPA approved chemicals designed specifically for control of immature and adult mosquitoes.
Larviciding is the application of pesticide to water for control of immature mosquitoes. Altosid®, an insect growth regulator (IGR), Golden Bear® Mosquito Larvicide, a refined mineral oil, and Agnique®, a monomolecular film are used for this purpose. All three products are classified as unrestricted pesticides by the EPA, and are registered for application in environmentally sensitive areas. The IGR blocks development of the mosquitoes to the adult stage. The oil and monomolecular film impair breathing until the mosquitoes die from a lack of oxygen. These products can be applied either by hand, with ground-based equipment or aerially.
Adulticiding sprays reduce the number of biting adult mosquitoes. Products currently being used in Chatham County include:
- Scourge®, a resmethrin/piperonlyl butoxide blend is used in ground applications and is applied at a rate of .0035 - .007 pounds of active ingredient per acre.
- Trumpet®, a water-based naled formulation is used in aerial applications and is applied at a rate of .05 - .1 pounds of active ingredient per acre.
These slightly toxic materials break down rapidly, have no residual effect. Ground applications are performed using ultra low volume (ULV) spray equipment mounted on trucks. Treatment is usually limited to dusk, dawn and nighttime hours. Aerial applications, also using ULV technology, are usually limited to dusk or dawn hours. Local police departments are contacted prior to making aerial pesticide applications.
Employees applying insecticides are licensed by the GDOA or work under the supervision of licensed technical staff. Licensed staff are required by State Law to participate in an on-going education program. All application equipment is regularly calibrated to insure that correct amounts of pesticide are delivered. Appropriate records of all operations are maintained.