| insecticide susceptibilities of cat fleas (siphonaptera: pulicidae) from several regions of the united states. | eleven cat flea, ctenocephalides felis (bouchè), strains, seven field-collected and four laboratory-colonized, were assayed for susceptibilities to five insecticides (carbaryl, chlorpyrifos, malathion, permethrin, and pyrethrin) with an insecticide-treated, horizontally-oriented, nylon 6,6 disk in a test tube. the pyrethrin was synergized using piperonyl butoxide (pbo). flea mortality at two doses was recorded after 4 and 24 h exposures. the field strains from texas and florida tolerated carbary ... | 2002 | 12349857 |