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Efficacy of the pyrethroid alpha-cypermethrin against Bactrocera oleae populations from Greece, and improved diagnostic for an iAChE mutation

Margaritopoulos, J. T., Skavdis, G., Kalogiannis, N., Nikou, Dimitra, Morou, Evangelia, Skouras, P. J., Tsitsipis, J. A. and Vontas, John (2008) 'Efficacy of the pyrethroid alpha-cypermethrin against Bactrocera oleae populations from Greece, and improved diagnostic for an iAChE mutation'. Pest Management Science, Vol 64, Issue 9, pp. 900-908.

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BACKGROUND: The most important pest of olive orchards worldwide is the olive fruit fly Bactrocera oleae (Gmelin). Its control in Greece has been based on organophosphates (OPs), but their intense use has led to the development of resistance. A test previously developed to monitor the trait may not be as robust as originally thought. The pyrethroid alpha-cypermethrin has recently been registered for bait sprays, as an alternative to OPs.
RESULTS: The susceptibility of 20 B. oleae populations to alpha-cypermethrin was examined. Variation was observed in their response, with LD50 ranging from 0.14 to 3.28ng insect(-1) and resistance factors from 2.3 to 54.7. Resistance mechanisms were investigated. Cytochrome P450 monoxygenase activities showed an association with resistance. Sequences in the domain IIS4-IIS6 of the B. oleae para-type sodium channel were also analysed, but no resistance-associated mutations were identified. Finally, a novel diagnostic assay able to reliably monitor the frequency of the iAChE G488S resistance mutation was developed.
CONCLUSION: This is the first attempt to evaluate the efficacy of alpha-cypermethrin against B. oleae from Greece. Data showed that it can be used effectively, but also highlighted the importance of continuous monitoring. The IIS4-IIS6 sodium channel region is the default area in which to look for resistance mutations if target-site resistance to pyrethroids arises. The application of the novel iAChE molecular diagnostic may facilitate the introduction of pyrethroids alongside OPs currently in use. (C) 2008 Society of Chemical Industry.

Item Type: Article
Uncontrolled Keywords: pyrethroid resistance sodium channel p450s olive fruit fly greece sodium-channel gene olive fruit-fly organophosphate-insensitive acetylcholinesterase knockdown resistance kdr point mutations insecticide resistance bemisia-tabaci identification tephritidae expression
Subjects: QU Biochemistry > Genetics > QU 475 Genetic processes
QW Microbiology and Immunology > QW 45 Microbial drug resistance. General or not elsewhere classified.
QW Microbiology and Immunology > Immune Responses > QW 700 Infection. Mechanisms of infection and resistance.
QX Parasitology > Insects. Other Parasites > QX 600 Insect control. Tick control
QX Parasitology > Insects. Other Parasites > QX 650 Insect vectors
Faculty: Department: Groups (2002 - 2012) > Vector Group
Digital Object Identifer (DOI):
Depositing User: Users 183 not found.
Date Deposited: 24 Aug 2010 10:41
Last Modified: 06 Feb 2018 13:00


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