AIRBORNE INSECTICIDE RESIDUES AFTER BROADCAST APPLICATION FOR CAT FLEA (SIPHONAPTERA, PULICIDAE) CONTROL

Airborne residues of chlorpyrifos, propetamphos, and permethrin were m easured up to 50 h after broadcast treatment for cat flea, Ctenocephal ides felis (Bouchi), control in residences. Type of insecticide, time after treatment, ventilation regime, and height above floor significan tly affected airborne residues. Before spraying chlorpyrifos, residues were low or undetected. In nonventilated residences, chlorpyrifos res idues peaked 0-6 h after treatment at 38 ng/liter, then slowly decline d through 50 h In ventilated residences, chlorpyrifos residues peaked from 2 to 10 h after treatment at 25-27 ng/liter, then declined to 8 n g/liter at 50 h. Propetamphos and permethrin residues in nonventilated residences peaked in 0-2 h at 32-40 and 40-44 ng/liter, respectively. Propetamphos peaked at 12-17 ng/liter at 0-2 h in ventilated residenc es. Permethrin was not detected in any of the samples in ventilated re sidences. Maximum airborne concentrations were 74 ng/liter chlorpyrifo s, 49 ng/liter propetamphos, and 54 ng/liter permethrin.