Avaliação in vitro da eficácia de acaricidas sobre Boophilus microplus (Canestrini, 1887) (Acari: Ixodidae) de bovinos no município de Ilhéus, Bahia, Brasil

Júnior, Dunezeu Alves Campos; Oliveira, Paulo Roberto de

doi:10.1590/s0103-84782005000600025

Cited by 43 publications

(26 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The association evaluated in this test involved an organophosphate and a pyrethroid. Some published reports concerning the efficacy of this type of association can be found, as it could be seen that in Bahia State, municipality of Ilhéus, the efficacy was of about 75.73% (CAMPOS JUNIOR;OLIVEIRA, 2005) and efficiency ranged from 40.38% to 76.81% in Ibiúna, State of Sao Paulo (MENDES et al, 2007). In addition, in the present study, this association was not able to produce good levels of efficiency.…”

Section: Discussionmentioning

confidence: 99%

“…Chemical control of ticks has been characterized by continuous increase of resistance, with consequent increase in the frequency of acaricides application and the presence of residues of these products in milk and meat (VARGAS et al, 2003;CAMPOS JUNIOR;OLIVEIRA, 2005;MENDES, 2005). A chemical base tick must present more than 95% efficacy on a sensitive strain of R.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Acaricides efficiency on Rhipicephalus(Boophilus) microplus from Bahia state North-Central region

Filho

Silva

Sousa

et al. 2013

Rev. Bras. Parasitol. Vet.

View full text Add to dashboard Cite

The cattle tick Rhipicephalus (Boophilus) microplus is responsible for major losses in the Brazilian livestock, mainly due to reduction in cattle productive performance. Resistance development to major classes of acaricide widely used nowadays has been extensively reported, as well as the occurrence of residues from these compounds in animal products and the environment. This study aimed to evaluate the efficiency of acaricides on R. (B.) microplus collected from rural properties in the North-Central region of Bahia State. Ticks were collected in several cattle farms in the cited region, and an in vitro acaricide efficiency assay was performed based on the immersion of ticks in acaricide solutions made according to manufacturers' recommendations. The results obtained in the experiments indicated varying degrees of efficiency of the several bases studied, with the products benzofenilurea, macrocyclic lactone and fipronil showing the highest levels of efficiency, 100%, 100% and 97.34%, respectively. It was possible to conclude that, for the region studied, there are different degrees of commercial acaricides efficiency, and many present less than 95% effectiveness, value determined as acceptable by the Brazilian legislation.Keywords: Ticks, cattle, drug resistance, acaricide, Brazilian Northeast. ResumoO carrapato Rhipicephalus (Boophilus) microplus é responsável por grandes perdas na pecuária brasileira, principalmente devido à redução no desempenho produtivo dos animais. A resistência do parasita a diferentes classes de acaricidas tem sido amplamente relatada, bem como os problemas de ocorrência de resíduos desses compostos em produtos de origem animal e no ambiente. Esse estudo teve como objetivo avaliar a eficiência de diversos acaricidas sobre populações de R. (B.) microplus provenientes de propriedades rurais da Região Centro-Norte do Estado da Bahia, Brasil. Teleóginas ingurgitadas foram colhidas em diferentes propriedades da região e submetidas a ensaio in vitro de eficiência de acaricidas, baseado na imersão dos carrapatos em soluções de acaricidas feitas seguindo as recomendações dos fabricantes. Os resultados obtidos indicam níveis variados de eficiência das bases estudadas, com os acaricidas benzofenilureia, lactona macrocíclica e fipronil apresentando os índices mais altos de eficiência, 100%, 100% e 97.34%, respectivamente. Pode-se concluir que, para a região estudada, os acaricidas apresentam níveis diversos de eficiência, e muitos deles possuem eficácia de menos de 95%, como recomendado pela legislação brasileira.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acaricides efficiency on Rhipicephalus(Boophilus) microplus from Bahia state North-Central region

Filho

Silva

Sousa

et al. 2013

Rev. Bras. Parasitol. Vet.

View full text Add to dashboard Cite

show abstract

“…The first amitraz-resistant cattle-tick population in Brazil was detected in 1994, subsequently, cases of resistance have been reported in other parts of this country (CAMPOS JÚNIOR. ;OLIVEIRA, 2005;ANDREOTTI et al, 2011;VEIGA et al, 2012). In the state of Rio Grande do Sul, several cases of resistance have been reported (VARGAS et al, 2003;CAMILLO et al, 2009;SANTOS et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Comparison of three larval bioassays to evaluate susceptibility of Rhipicephalus (Boophilus) microplus to amitraz

Santos

Klafke²,

Pappen

et al. 2013

Rev. Bras. Parasitol. Vet.

View full text Add to dashboard Cite

Field samples of Rhipicephalus (Boophilus) microplus from the state of Rio Grande do Sul, Brazil, were assessed using the following methods: larval packet test (LPT), larval immersion test (LIT) and syringe immersion test (SIT). The following parameters were determined for each population and for the Mozo susceptible reference strain: lethal concentration for 50% (LC 50 ) with its 95% confidence interval (95% CI), regression line slope and resistance ratio (RR). Using the LPT, only one population was susceptible to amitraz, presenting a RR of 1.9. Using the same technique, the other populations presented RRs of between 92.9 and 3445.8 and were considered resistant. The LC 50 of the Mozo strain calculated using the LPT, LIT and SIT was 2.9, 27.3, and 52.7 µg/mL, respectively. In general, a good fit to the probit statistical model was only achieved using the LPT. The results obtained in this study impair recommendations for using the LIT and SIT to diagnose amitraz resistance in R. (B.) microplus populations. Additional studies are required to improve the sensitivity of these tests in relation to the LPT.Keywords: Rhipicephalus (Boophilus) microplus, amitraz, bioassays, resistance diagnosis. ResumoAmostras de Rhipicephalus (Boophilus) microplus coletadas à campo no Rio Grande do Sul, Brasil, foram analisadas pelos seguintes métodos: teste do pacote de larvas (TPL), teste de imersão de larvas (TIL) e teste de imersão em seringas (TIS). Os seguintes parâmetros foram determinados para cada população e para a amostra referência suscetível Mozo: concentração letal para 50% (CL 50 ) e seu intervalo de confiança de 95% (IC95%), inclinação da reta de regressão e os fatores de resistência (FR). Pelo TPL, apenas uma população foi sensível ao amitraz, com FR de 1,9. Utilizando a mesma técnica, as outras amostras apresentaram FR entre 92,9 e 3445,8 sendo consideradas resistentes. As CL 50 da cepa Mozo calculadas por meio do TPL, TIL e TIS foram 2,9, 27,3 e 52,7 µg/mL, respectivamente. De forma geral, a adequação ao modelo estatístico de probitos só foi alcançada com o uso do TPL. Os resultados obtidos no presente estudo limitam a recomendação de uso do TIL e TIS para diagnóstico de resistência ao amitraz em populações de R. (B.) microplus. Estudos adicionais são necessários para aprimorar a sensibilidade destes testes em relação ao LPT.Palavras-chave: Rhipicephalus (Boophilus) microplus, amitraz, bioensaio, diagnóstico de resistência.

show abstract

“…However, the indiscriminate use of these substances has been conducted to the appearance of several cases of tick resistance (Arantes et al, 1995). This phenomenon has been widely reported (Li et al, 2004;Rosado-Aguilar et al, 2008), including various descriptions in Brazil (Campos Júnior;Oliveira, 2005;Gomes et al, 2011), where there are reports in Rio Grande do Sul (Patarroyo;Costa, 1980), Minas Gerais, Espírito Santo (Leite et al, 1995), São Paulo (Soares et al, 2001), Bahia and Pernambuco (Santana et al, 2013).…”

Section: Introductionmentioning

confidence: 83%

“…microplus population studied. Percentages of inefficacy ranging from 30.95 to 88.75% have been reported in Bahia, Pernambuco, Minas Gerais and São Paulo (Arantes et al, 1995;Santana et al, 2001;Campos-Júnior;Oliveira, 2005;Mendes et al, 2007). Conversely, few studies report the efficacy of this compound (e.g., 98.13%, Mendes et al, 2007) as observed herein for the populations of Timbaúba and Limoeiro.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the efficacy of cypermethrin and amitraz against Rhipicephalus (Boophilus) microplus, in the State of Pernambuco, Brazil

et al. 2016

View full text Add to dashboard Cite

The Rhipicephalus (Boophilus )microplus is an important tick species which affect bovines in tropical areas. Its control is based on the use of chemical acaricides, but the frequent use of these substances has been conducted to the development of tick resistance. The aim of this study was to assess the efficacy of cypermethrin and amitraz against R. (B. )microplus collected of bovines from different municipalities of the state of Pernambuco. From August 2009 to July 2011, engorged females were collected and subjected to the "Adult Immersion Test" in order to evaluate the efficacy of cypermethrin and amitraz. The results indicate that populations of R. (B. )microplus from Pernambuco present resistance to acaricides (i.e., cypermethrin and amitraz). In this study, a single population (Brejo da Madre de Deus) was susceptible to cypermethrin, whereas two (Timbaúba and Limoeiro) were susceptible to amitraz. Data herein reported follow a pattern observed in other regions of Brazil and alert to the fact that alternative measures of control should be implemented in this area studied.

show abstract

Avaliação in vitro da eficácia de acaricidas sobre Boophilus microplus (Canestrini, 1887) (Acari: Ixodidae) de bovinos no município de Ilhéus, Bahia, Brasil

Cited by 43 publications

References 2 publications

Acaricides efficiency on Rhipicephalus(Boophilus) microplus from Bahia state North-Central region

Acaricides efficiency on Rhipicephalus(Boophilus) microplus from Bahia state North-Central region

Comparison of three larval bioassays to evaluate susceptibility of Rhipicephalus (Boophilus) microplus to amitraz

Evaluation of the efficacy of cypermethrin and amitraz against Rhipicephalus (Boophilus) microplus, in the State of Pernambuco, Brazil

Contact Info

Product

Resources

About