Efficacy of Fenoxycarh Against Mosquitoes (Diptera: Culicidae) and Its Persistence in the Laboratory and Field

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Abstract
Fenoxycarb is effective against susceptible and organophosphorus-resistant mosquitoes. When larvae are exposed, mortality occurs in the pupal stage or abnormal adults are formed. Most sensitive are fourth instars 19–27 h before pupation. A dosage of 0.02 kg/ha was effective for controlling larvae when applied by hand can or aircraft. Fenoxycarb is moderately stable in water over a pH range of 6.5–10 and a temperature range of 10–38°C. It tends to adsorb onto organic matter and this may largely limit its persistence in water in the fields. Residues in the water could only be detected up to 48 h after application of 0.03 or 0.02 kg/ha. Bluegill sunfish, Lepomis macrochirus, accumulate a continuous dose of 1 ppm fenoxycarb from water ca. 20-fold into their tissue; however, the tissue residues decline quickly after the fish are placed in untreated rinse water.