Resistance to insect growth regulator insecticides in populations of sheep lice as assessed by a moulting disruption assay

Low‐volume, backline applications with the benzoylphenyl urea insecticides triflumuron and diflubenzuron represent in excess of 70% of treatments for the control of sheep lice, Bovicola ovis (Schrank) (Phthiraptera: Trichodectidae), in Australia. Reports of reduced effectiveness from 2003 and subseq...

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Bibliographic Details
Published in:Medical and veterinary entomology 2008-12, Vol.22 (4), p.326-330
Main Authors: JAMES, P. J., CRAMP, A. P., HOOK, S. E.
Format: Article
Language:English
Subjects:
Animals
Benzamides - pharmacology
Biological Assay
Bovicola ovis
diflubenzuron
Diflubenzuron - pharmacology
Insecticide Resistance
Insecticides - pharmacology
Lice Infestations - drug therapy
Lice Infestations - veterinary
Molting - drug effects
Nymph - drug effects
Ovis
Phthiraptera
Phthiraptera - drug effects
resistance
Trichodectidae
triflumuron
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Summary:Low‐volume, backline applications with the benzoylphenyl urea insecticides triflumuron and diflubenzuron represent in excess of 70% of treatments for the control of sheep lice, Bovicola ovis (Schrank) (Phthiraptera: Trichodectidae), in Australia. Reports of reduced effectiveness from 2003 and subsequent controlled treatment trials suggested the emergence of resistance to these compounds in B. ovis populations. A laboratory assay based on the measurement of moulting success in nymphs was developed and used to assess susceptibility to diflubenzuron and triflumuron in louse populations collected from sheep where a control failure had occurred. These tests confirmed the development of resistance to triflumuron and diflubenzuron in at least two instances, with estimated resistance ratios of 67–94X at LC50.
ISSN:0269-283X
1365-2915
DOI:10.1111/j.1365-2915.2008.00753.x