Effect of the formulation with fipronil and fluazuron on the reproductive biology and ovaries histopathology of Rhipicephalus microplus engorged females

Secchis, Mirna Vieira; Vale, Letícia; Rodrigues, Daniel Alencar; Perinotto, Wendell Marcelo de Souza; Matos, Renata da Silva; Lopes, Thiago Rocha; Brito, Pedro Vale de Azevedo; Lopes, Welber Daniel Zanetti; Arruda, Walquíria; Monteiro, Caio Márcio de Oliveira

doi:10.1007/s00436-022-07454-2

Cited by 5 publications

(1 citation statement)

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“…Engorged females of R. microplus Gyn strain 41 were obtained from artificially infested cattle at the Escola de Veterinária e Zootecnia (EVZ) of the Universidade Federal de Goiás, Goiânia, Goiás, Brazil. Seventy‐two engorged females were weighed and distributed by weight as homogeneously as possible in 12 groups ( p > 0.05).…”

Section: Methodsmentioning

confidence: 99%

From the laboratory to the field: efficacy of entomopathogenic nematodes to control the cattle tick

Gomes

Matos²,

Barreto

et al. 2022

Pest Management Science

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BACKGROUND:The control of ticks is challenged by the resistance of tick populations to chemical acaricides. In this study, we evaluated, under laboratory conditions, the efficacy of Heterorhabditis bacteriophora against Rhipicephalus (Boophilus) microplus engorged females with varying body weights (150, 200, 250, 300 or 350 mg per female) or from eight different geographical populations. We also determined the efficacy of H. bacteriophora for tick control under field conditions. RESULTS: R. microplus engorged females with varying body weights exposed to 150 juveniles of H. bacteriophora resulted in a high control efficacy (97.5% to 98.4%). Tests with females from different geographical populations comprised eight tick strains treated with H.bacteriophoraandtheirrespectivecontrolgroups.Thebiologicalparametersoffemalesexposedtonematodetreatmentsdidnotdiffer significantly and resulted in 89% to 99% of control efficacy. Trials conducted under field conditions were performed in field plots with Megathyrsusmaximusgrass.TreatmentgroupsreceivedeightcadaversofTenebriomolitorfully colonizedwithH.bacteriophoraat1 week prior to the release of female ticks, whereas control groups were untreated. On the first day of the experiment, six engorged females were distributed in each plot. On day 42 and day 63, the apical portion of the grasses with R. microplus larvae were collected and quantified. The population of R. microplus larvae was reduced up to 73.1% in plots treated with H. bacteriophora at day 63 after treatment. CONCLUSION: R. microplus engorged females with varying body weights or from different geographical populations were highly susceptible to H. bacteriophora. The field test demonstrated the efficacy of H. bacteriophora in reducing R. microplus larvae in infested pastures.

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Section: Methodsmentioning

confidence: 99%