Resistance to benzoylphenyl urea insecticides in Australian populations of the sheep body louse.
A laboratory bioassay based on the failure of eggs laid by diflubenzuron-treated sheep body lice Bovicola ovis (Schrank) (Phthiraptera; Trichodectidae) to produce nymphs is described. The test is capable of detecting benzoylphenyl urea-resistant populations. A susceptible discriminating dose (topical treatment of female lice with 0.10 microg diflubenzuron) suitable for screening suspect resistant populations is suggested but testing of further populations that are naïve to these insect growth regulator insecticides is warranted.
Levot
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Elizabeth Macarthur Agricultural Institute, NSW Department of Primary Industries, New South Wales, Australia. garry.levot@dpi.nsw.gov.au
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D000818:Animals; D001315:Australia; D004132:Diflubenzuron / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D005260:Female; D007305:Insecticide Resistance; D007306:Insecticides / Q000494:pharmacology*; D009758:Nymph / Q000187:drug effects; D008003:Phthiraptera / Q000187:drug effects*; D014935:Wool
D007306:Insecticides; D004132:Diflubenzuron