Rhipicephalus (Boophilus) microplus in the western-central region of Rio Grande do Sul, Brazil: multiresistant tick

Machado, Fabrício Amadori; Pivoto, Felipe Lamberti; Ferreira, Maiara Sanitá Tafner; Gregorio, Fabiano de Vargas; Vogel, Fernanda Silveira Flôres; Sangioni, Luís Antônio

doi:10.1590/s1984-29612014063

Cited by 14 publications

(5 citation statements)

References 22 publications

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“…Rhipicephalus microplus is an important cattle tick that is widely distributed in tropical and subtropical agroecosystems worldwide (Lovis et al, 2011;Machado et al, 2014). This species causes economic losses in the cattle production industry by reducing weight gain and milk production in cattle, depreciating the quality of leather and transmitting pathogens (Rodriguez-Vivas et al, 2004;Grisi et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Assessment of the repellent effect of Lippia alba essential oil and major monoterpenes on the cattle tick Rhipicephalus microplus

Lima

Carvalho

Peixoto

et al. 2015

Medical Vet Entomology

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The control of Rhipicephalus microplus (Ixodida: Ixodidae) is achieved using synthetic acaricides. However, resistant tick populations are widespread around the world. Plant essential oils can act as repellents, keeping ticks away from hosts and decreasing the selection pressure on synthetic acaricides. The aim of this study was to evaluate the in vitro repellent effect of Lippia alba essential oil on R. microplus larvae. Leaves from two L. alba genotypes maintained under the same agronomic and environmental conditions were collected. Essential oil was extracted by hydrodistillation and analysed by gas chromatography-mass spectrometry (GC-MS). The major monoterpenes detected in the chemical analysis were commercially acquired and tested. For the repellency test, a glass rod was vertically fixed to measure active climbing of approximately 30 R. microplus larvae aged 14-21 days in response to essential oils and monoterpenes. Repellency was evaluated at 1 h, 3 h and 5 h after treatment. Variation in repellent action was detected between the genotypes. The major monoterpenes identified in the essential oils (limonene and carvone) showed low repellent effects in comparison with intact essential oils. Thus, the present results showed that L. alba essential oil contains bioactive compounds with great repellent activity against ticks that varies according to the plant genotype.

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Section: Introductionmentioning

confidence: 99%

Assessment of the repellent effect of Lippia alba essential oil and major monoterpenes on the cattle tick Rhipicephalus microplus

Lima

Carvalho

Peixoto

et al. 2015

Medical Vet Entomology

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“…The chemical compounds with isolated active principles did not achieve superior efficiency (66.17%). In contrast, among the associations tested, only two formulations obtained an average efficiency above 95%, demonstrating a scenario of marked tick resistance to acaricides in this particular area (Machado et al, 2012). In the same Brazilian state, Reginato et al (2017) evaluated a total of 54 farms where 4 different chemical compounds were used.…”

Section: Resultsmentioning

confidence: 94%

Factors associated with the efficiency of acaricides on different populations of Rhipicephalus microplus

Menin¹,

Xavier²,

Grigolo³

et al. 2019

Braz. J. Vet. Res. Anim. Sci.

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Tick infestation causes major problems in cattle. Tick parasitism accounts for significant economic losses in many beef and dairy herds in the vast majority of the states in the Brazilian territory including the State of Santa Catarina in the southern region of the country. Tick resistance to several active principles occurs due to a number of factors including the indiscriminate, injudicious and inadequate use of tick insecticides. Considering the great importance of fighting off tick infestations in cattle, we evaluated the efficiency of 8 different topical active principles against the ixodid tick R. microplus and identified the main factors that contribute to the development of ticks that are resistant to acaricides in the farms and bovine herds studied. For such purpose, R. microplus telegionae were collected in 39 farms locates in different municipalities of the West of Santa Catarina, south Brazil. At the time of sample collection, information about the management, the history of the acar used in the herd, the number of annual applications of these pesticides, the frequency of acaricide rotation, and the frequency of technical monitoring for strategic tick control were retrieved. We collected this data in order determine contributing factors to the development resistant R. microplus populations. For the sensitivity profile of these ticks to a number of different acaricides tested, 10 engorged females for each principle and a control were used. The results of our study show that most associations between pyrethroids and organophosphates had an efficiency between 96.6% and 100% in the control of R. microplus except for the combination of Alfacipermetrine 15%, Ethion 16%, and Chlorpyrifos 8.5% that had 93.4% of efficiency. Among the chemicals not associated with any other type of compound, Amitraz 12.5% was effective in 98.3% of the cases. In contrast, Cypermethrin 15% had an efficiency in only 25.8% of the farms/herds analyzed. Based on the results of the present study, we may infer that the methods of control and management used by producers may be related to the low indexes of resistance to topical acaricides in the different populations of ticks in the study area.

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“…Of the ten field samples evaluated, five were found to be resistant to fluazuron. An analysis of the history of these farms revealed that two of them (MIG and ESP), where resistance to the three active ingredients was detected, had purchased cattle that were already infested from the southern region of the country, where there are numerous reports of acaricide resistance (Martins & Furlong, 2001;Castro-Janer et al, 2009;Reck et al, 2014;Machado et al, 2014). At the farm where the JUL sample was obtained, fluazuron has been used for many years to control cattle ticks, but no animals have been purchased from other farms.…”

Section: /7mentioning

confidence: 99%

Status of Rhipicephalus microplus resistance to ivermectin, fipronil and fluazuron in Mato Grosso do Sul, Brazil

Valsoni

Freitas

Borges

et al. 2021

Rev. Bras. Parasitol. Vet.

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Southern cattle tick resistance to pour-on and injectable acaricides has yet to be evaluated on a broader scope, and the paucity of information on the subject may hinder efforts to control this parasite. The objective of this study was to evaluate the resistance profile of ten populations of Rhipicephalus microplus to the acaricides fluazuron, fipronil and ivermectin in cattle herds in Mato Grosso do Sul, Brazil. The larval immersion test (LIT) was used to evaluate susceptibility to ivermectin and fipronil and the adult immersion test (AIT) was performed to evaluate fluazuron. Samples were randomly obtained in ten farms, and in general, we found resistance in five samples to fluazuron and in four samples to ivermectin and fipronil. Six samples showed incipient resistance to ivermectin and fipronil. Five of the ten evaluated samples showed resistance and/or incipient resistance to all the active ingredients, and the other five to two active ingredients. Among the samples classified as resistant, the average resistance ratio for ivermectin was 2.75 and 3.26 for fipronil. These results demonstrate the advanced status of resistance to the most modern chemical groups for the control of R. microplus in the state of Mato Grosso do Sul.

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Rhipicephalus (Boophilus) microplus in the western-central region of Rio Grande do Sul, Brazil: multiresistant tick

Cited by 14 publications

References 22 publications

Assessment of the repellent effect of Lippia alba essential oil and major monoterpenes on the cattle tick Rhipicephalus microplus

Assessment of the repellent effect of Lippia alba essential oil and major monoterpenes on the cattle tick Rhipicephalus microplus

Factors associated with the efficiency of acaricides on different populations of Rhipicephalus microplus

Status of Rhipicephalus microplus resistance to ivermectin, fipronil and fluazuron in Mato Grosso do Sul, Brazil

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