Efficacy of CME 134 against mosquitoes (Diptera: Culicidae): effects on nontarget organisms and evaluation of potential chemical persistence

CME 134, 1-(3,5-dichloro-2,4-difluorophenyl)3-(2,6-difluorobenzoyl) urea, is very active against immature mosquitoes. The operational use rate appeared to be 0.0056 kg (AI)/ha (0.005 lb/acre). When applied at the latter rate, the compound is safe to nontarget, aquatic organisms. CME 134 is stable in water under acidic conditions and less stable when temperature and pH increase simultaneously; sunlight has little effect on its aqueous stability. CME 134 might adsorb onto organic matter, thus affecting residual activity in field water.