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Cross resistance spectra and effects of synergists in insecticide-resistant strains of Lucilia cuprina (Diptera: Calliphoridae)

Published online by Cambridge University Press:  10 July 2009

A.C. Kotze  and
N. Sales
A.C. Kotze*
Affiliation:
Biological and Chemical Research Institute, NSW Agriculture, Rydalmere, Australia
N. Sales
Affiliation:
Biological and Chemical Research Institute, NSW Agriculture, Rydalmere, Australia
*
Dr A.C. Koize, BCRI, NSW Agriculture, PMB 10, Rydalmere, NSW 2116, Australia.
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Abstract

Cross-resistance spectra were determined in strains of the Australian sheep blowfly, Lucilia cuprina (Wiedemann), which had been pressured for several years in the laboratory with diflubenzuron, butacarb or deltamethrin. Each strain was highly resistant to its selecting chemical (resistance factors > 1000-fold), however, cross-resistance levels were variable and often low. In particular, strains selected with diflubenzuron and butacarb showed very little resistance to deltamethrin (resistance factors <7-fold). Each strain showed resistance levels to diazinon only slightly higher than the highest levels currently detected in field strain larvae. Piperonyl butoxide and triphenyl phosphate significantly synergized each pressured strain with its selecting chemical, suggesting the involvement of both monooxygenases and esterases in the observed resistances. Synergism ratios in each case were greater with piperonyl butoxide. The lack of any alteration in in vitro acetylcholinesterase sensitivity to butacarb inhibition in the butacarb-selected strain, and only low level resistance to DDT in the deltamethrin-selected strain, provided no evidence for target-site insensitivities in these strains. The low-moderate levels of cross-resistance therefore imply the existence of qualitative differences in the detoxification systems in each strain.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 84 , Issue 3 , September 1994 , pp. 355 - 360
Copyright
Copyright © Cambridge University Press 1994

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