|Publication Type:||Journal Article|
|Year of Publication:||1994|
|Authors:||G. W. Levot|
|Journal:||Journal of the Australian Entomological Society|
|Pagination:||123 - 126|
|Keywords:||Australia, body, Damalinia ovis, Diptera, flies, Helicoverpa, insecticide, lepidoptera, louse, metabolism, Pyrethrum, sheep, toxicity|
Piperonyl butoxide (PBO) synergised the synthetic pyrethroids (SPs) cypermethrin, deltamethrin, cyhalothrin and alpha- cypermethrin in a concentration-dependent manner in susceptible and both low- and high- SP-resistant strains of the sheep body louse Bovicola ovis. Synergism ratios as high as 23 x were recorded when 200 mg/L PBO was mixed with deltamethrin in bioassays with the highly resistant Hartley strain. High PBO synergism implicates mono-oxygenase detoxification of SPs as a major cause of SP resistance in B. ovis. The possibility of mixing PBO with existing SP lousicide products to control pyrethroid resistant lice is discussed.