Chemical control, a short-term strategy, involves the application of insecticides either by hand (hand cans, granular spreaders, ATV’s, or truck mounted spray rigs), or by aircraft. The chemicals used by this District are listed below. None of these materials has any significant residual activity (pyrethrin degrading within four to six hours, methoprene persisting for about three days, and BVA-2 lasting less than two days).
- Pyrethrin, an insecticide derived from chrysanthemum flower heads and used to control adult mosquitoes and yellowjackets.
- Methoprene, an insect growth regulator that specifically effects mosquitoes by preventing adult emergence.
- BVA-2, a surfactant that effects all immature stages of mosquitoes including pupae.