Abstract
Effects of synergists to pyrethrins, and the mixtures of pyrethrins and lindane were evaluated, using houseflies with topical application method. The relative potency of synergists to pyrethrins was as follows : piperonyl butoxide, 11.06; sulfoxide, 9.62; S-421, 2.61; cynethrin, 1.07. In the mixtures of pyrethrins and lindane, the synergistic effects of piperonyl butoxide and sulfoxide increased in proportion to pyrethrins content, and effect of S-421 was influenced with neither pyrethrins nor lindane. Effect of cynethrin was of slight degree.
