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).
Synthetic pyrethroids (e.g. allethrin, etofenprox, permethrin) are synthetic derivatives of naturally occurring pyrethrins and are used by the District to control yellowjackets and adult mosquitoes.