Effects of mid-season avermectin treatments on pyrethroid resistance in horn fly (Diptera: Muscidae) populations at three locations in Louisiana

Oremus, Glenn R.; Guerrero, Felix D.; Alison, M. W.; Kimball, Meredith M.; Kim, J.H.; Foil, Lane D.

doi:10.1016/j.vetpar.2006.05.009

Cited by 14 publications

(7 citation statements)

References 12 publications

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“…This is in agreement with previous findings by Jamroz et al (1998). As metabolic detoxification mechanisms conferred by enhanced MFOs may be an important factor in pyrethroid resistance, PBO-synergized pyrethroids may be used in rotation with other insecticides to slow down the development of pyrethroid resistance (Oremus et al, 2006). It has been demonstrated in a mosquito species that use of a PBO-synergized pyrethroid can significantly reduce the rate of development of pyrethroid resistance when resistance was mainly conferred by MFO-based detoxification (Kumar et al, 2002).…”

Section: Discussionsupporting

confidence: 91%

“…Various concentrations of permethrin were generated in acetone through serial Brazil (Barros et al, 2002;Guerrero & Barros, 2006). Various resistance mitigation strategies, such as insecticide mixtures, synergists, or rotation with different classes of insecticides have been attempted to resolve problems of resistance to pyrethroids in horn flies (Byford et al, 1987;Sparks & Byford, 1988;Mckenzie & Byford, 1993;Guglielmone et al, 1999;Oremus et al, 2006).…”

Section: Bioassaymentioning

confidence: 99%

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Dynamics and mechanisms of permethrin resistance in a field population of the horn fly, Haematobia irritans irritans

Lohmeyer

Miller

2009

Insect Science

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Dynamics and mechanisms of permethrin resistance in a field population of the horn fly, Haematobia irritans irritans Abstract A study was conducted at the Pressler ranch, near Kerrville, Texas, USA between 2002 and 2006 to determine the dynamics and mechanisms of resistance to permethrin in a field population of the horn fly, Haematobia irritans irritans (L.). Changes of resistance to pyrethroid insecticide associated with use of a pour-on formulation of cyfluthrin in 2002 and use of diazinon ear tags in subsequent years were studied using a filter paper bioassay technique and a polymerase chain reaction assay that detects two sodium channel mutations, kdr and super-kdr resistance alleles. A maximum of 294-fold resistance to permethrin was observed in the summer of 2002. A significant decrease in the resistance level was observed in spring 2003, and resistance continued to decline after animals were treated with diazinon ear tags. In response to pyrethroid treatments, the allelic kdr and super-kdr frequency increased from 56.3% to 93.8% and from 7.5% to 43.8%, respectively in 2002, and decreased significantly in 2003 when the pyrethroid insecticide was no longer used to treat animals. Females were found to have a higher allelic super-kdr frequency than males in 2002, while no difference was detected between males and females in the allelic kdr frequency. There was a significant positive correlation between frequencies of the sodium channel mutations and levels of permethrin resistance, suggesting that the sodium channel mutations, kdr and super-kdr, are the major mechanisms of resistance to pyrethroids in this horn fly population. Results of synergist bioassays also indicated possible contributions of two metabolic detoxification mechanisms, the mixed function oxidases (MFO) and glutathione S-transferases (GST). Compared to a horn fly infestation of an untreated herd, treatments with the pyrethroid pour-on formulation failed to control horn flies at the Pressler ranch in 2002. Sustained control of horn flies was achieved with the use of diazinon ear tags in 2003 and subsequent years.

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Section: Discussionsupporting

confidence: 91%

Section: Bioassaymentioning

confidence: 99%

Dynamics and mechanisms of permethrin resistance in a field population of the horn fly, Haematobia irritans irritans

Lohmeyer

Miller

2009

Insect Science

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“…For example, when mechanisms of resistance are mainly related to the kdr mutation, susceptibility is not easy to restore because resistant alleles can be maintained in the heterozygous individuals. Once the kdr allele is Þxed in a population, the situation is even worse because it is very difÞcult to restore insecticide susceptible individuals without the introduction of those individuals (Guerrero et al 2002, Oremus et al 2006.…”

Section: Discussionmentioning

confidence: 99%

High Levels of Insecticide Resistance in Introduced Horn Fly (Diptera: Muscidae) Populations and Implications for Management

Oyarzún

Figueroa

2011

jnl. econ. entom.

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The horn fly, Haematobia irritans (L.) (Diptera: Muscidae), was introduced to Chile in the beginning of the 1990s. Since its introduction, farmers have controlled this pest almost exclusively with insecticides. To understand the consequences of different control strategies on the development of insecticide resistance and their persistence, a field survey was conducted at eight farms in the south of Chile to characterize insecticide resistance in field populations and resistance mechanisms. Horn fly samples were assayed to determine levels of resistance to pyrethroids and diazinon, genotyped for kdr and HialphaE7 mutations, and tested for general esterase activity. All field populations, including ones that were not treated with insecticides for the past 5 yr, showed high levels of cypermethrin resistance and high frequencies of the kdr mutation. None of the fly populations demonstrated resistance to diazinon and the HialphaE7 mutation was not detected in any of the fly samples. Esterase activities in all populations were comparable to those found in the susceptible reference strain. The findings of high frequencies of homozygous resistant and heterozygous individuals both in insecticide treated horn fly populations and in the untreated fly populations suggests complex interactions among field populations of the horn fly in Chile.

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“…Furthermore, Foil et al (2005) used the PCR technique and showed that ßies with the kdr and super-kdr mutations were more resistant to pyrethroids than ßies without the mutations. Guerrero et al (2002) and Oremus et al (2006) presented data indicating once kdr becomes genetically This article reports the results of research only. Mention of a proprietary product does not constitute an endorsement or a recommendation by the United States Department of Agriculture for its use.…”

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confidence: 99%

Detection of Target Site Resistance to Pyrethroids and Organophosphates in the Horn Fly Using Multiplex Polymerase Chain Reaction

Foil

Guerrero

Bendele

2010

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The horn fly, Haematobia irritans L., is an obligate blood-feeding fly and the primary insect pest parasitizing cattle in the United States. Pesticide resistance has become a substantial problem for cattle producers, and although several mechanisms of resistance are possible, target site resistance is the most important mechanism preventing control of this fly in the United States and possibly other countries. We developed a multiplex polymerase chain reaction assay to detect the known target site, pyrethroid resistance-associated mutation in the horn fly and a recently reported G262A mutation in the horn fly acetylcholinesterase, the target site for organophosphates. As expected, the pyrethroid resistance target site mutation was found in fly populations from Texas, Louisiana, Washington, Georgia, Mexico, and Brazil. This mutation was found to have a gender bias as it was more prevalent in females than males. The G262A acetylcholinesterase mutation was found in Texas, Louisiana, Washington, Georgia, and Mexico, but not Brazil. There was no gender bias in the occurrence of this mutation, and there was no correlation between the occurrence of the kdr and the G262A mutations. Unlike the case with the pyrethroid target site mutation, the presence of G262A did not appear to exclusively provide the level of resistance required to account for bioassay results. It is likely an additional mutation(s) occurs in the target site and/or a metabolic resistance mechanism exists in organophosphate-resistant horn fly populations.

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Effects of mid-season avermectin treatments on pyrethroid resistance in horn fly (Diptera: Muscidae) populations at three locations in Louisiana

Cited by 14 publications

References 12 publications

Dynamics and mechanisms of permethrin resistance in a field population of the horn fly, Haematobia irritans irritans

Dynamics and mechanisms of permethrin resistance in a field population of the horn fly, Haematobia irritans irritans

High Levels of Insecticide Resistance in Introduced Horn Fly (Diptera: Muscidae) Populations and Implications for Management

Detection of Target Site Resistance to Pyrethroids and Organophosphates in the Horn Fly Using Multiplex Polymerase Chain Reaction

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