Pyrethroid synergism by piperonyl butoxide in Bovicola ovis (Schrank) (Phthiraptera, Trichodectidae)

Publication Type:Journal Article
Year of Publication:1994
Authors:G. W. Levot
Journal:Journal of the Australian Entomological Society
Pagination:123 - 126
Date Published:1994
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.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith