Disinsection of aircraft with pressure packs containing the pyrethroids, resmethrin and bioresmethrin

Abstract

Pyrethrins and the pyrethroids, bioallethrin ( (+) trans-chrysanthemic acid ester of ( i ) allethrolone), resmethrin* (5-benzyl-3-furylmethyl (f )&,trans-chrysanthemate) and bioresmethrint (5-benzyl-3lfurylmethyl (+)-trans-chrysanthemate) were compared for insecticidal activity against free-flying Aedes aegypti I . . in a Peet-Grady chamber using kerosene solutions and an aerosol particle size. The relative potency for kill of female mosquitoes was I ; 2-3; 6.8; 8.0 respectively. In further experiments, resmethrin and bioresmethrin were compared as aerosol formulations in a Comet 4C aircraft using caged and fed female A. aegypti. Both compounds at 0.1 % (by wt.) in pressure packs and 35 g of formulation per 100 m3 provided 99 % kill. It is suggested that pressure packs containing 0.5 % (by wt.) of either compound should be adequate for disinsection of passenger aircraft. However, bioresmethrin would appear to be the compound of choice in view of its greater biological efficiency under laboratory conditions, and consequent probable greater margin of kill in practice.

Prevention of Mosquitoes (Diptera: Culicidae) and House Flies (Diptera: Muscidae) from Entering Simulated Aircraft with Commercial Air Curtain Units

“…Some countries, not including the United States, require disinsection of arriving international ßights with a pesticide before disembarkation of passengers and crew that involves residual and aerosol spraying before landing (U.S. Department of Transportation 2004, MQS/AQIS 2004). The efÞcacy of such treatments has been evaluated extensively, and the results vary depending on the insecticide, the insect of interest, method of insect exposure, and the location of the test insects in the aircraft (Brooke and Evans 1971;Sullivan et al 1972Sullivan et al , 1975Sullivan et al , 1978Cawley et al 1974;Langsford et al 1976;Bailey 1977;Liljedah et al 1977;Russell and Paton 1989). In one World Health Organization study (Anonymous 1995), it was noted that some individuals might experience transient discomfort after aircraft disinsection.…”