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

James, P.J. and Cramp, A.P. and Hook, S.E. (2008) Resistance to insect growth regulator insecticides in populations of sheep lice as assessed by a moulting disruption assay. Medical and Veterinary Entomology, 22 (4). pp. 326-330.

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Article Link(s): http://dx.doi.org/10.1111/j.1365-2915.2008.00753.x

Publisher URL: http://www3.interscience.wiley.com/cgi-bin/home

Abstract

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.

Item Type:Article
Additional Information:© The State of Queensland through the Department of Primary Industries. © The Royal Entomological Society.
Keywords:Bovicola ovis (Schrank) (Phthiraptera: Trichodectidae); resistance; triflumuron; louse; Damalinia ovis; susceptibility; cypermethrin; diflubenzuron; parasites; surface; mode.
Subjects:Science > Zoology > Invertebrates > Insects
Veterinary medicine > Diseases of special classes of animals > Sheep and goats
Veterinary medicine > Veterinary parasitology
Science > Microbiology > Immunology
Deposited On:11 Feb 2009 03:36
Last Modified:19 Apr 2011 00:28

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