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Parasitology Research

, Volume 112, Issue 1, pp 45–58 | Cite as

Fluazuron-induced morphophysiological changes in the cuticle formation and midgut of Rhipicephalus sanguineus Latreille, 1806 (Acari: Ixodidae) nymphs

  • Patrícia Rosa de Oliveira
  • Izabela Braggião Calligaris
  • Gislaine Cristina Roma
  • Gervásio Henrique Bechara
  • Maria Izabel Camargo-MathiasEmail author
Original Paper

Abstract

The present study demonstrated the effects of the arthropod growth regulator, fluazuron (Acatak®), in the formation of the integument and digestive processes of Rhipicephalus sanguineus nymphs fed on rabbits treated with different doses of this chemical acaricide. For this, three different doses of fluazuron (20, 40, or 80 mg/kg) were applied “pour on” to the hosts (groups II, III, and IV), as well as distilled water to the control group. On the first day after treatment (24 h), the hosts were artificially infested with R. sanguineus nymphs. After full engorgement (7 days), the nymphs were removed, placed on labeled Petri dishes, and kept in biochemical oxygen demand incubator for 7 days. The engorged nymphs were then taken for morphological, histochemical, and histological analyses. The results showed the occurrence of cytological, morphohistological, and histochemical alterations in the integument and midgut of nymphs from all the different treated groups. These alterations occurred at cuticular level in the subdivisions of the cuticle, related to the size of the digestive cells, amount of accumulated blood elements, and digestive residues, as well as the presence of vacuoles in the cytoplasm of the digestive cells. Thus, this study demonstrated that fluazuron acts on the integument and midgut cells of R. sanguineus nymphs fed on treated rabbits and pointed out the possibility of the use of this chemical—which is more specific, less toxic, and less harmful to the environment and nontarget organisms—in the control of R. sanguineus, at least in the nymphal stage of its biological cycle.

Keywords

Chitin Tick Species Diflubenzuron Digestive Cell Methoprene 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We would like to thank to FAPESP (grant no. 2010/50827-0) for financial support and CNPQ academic career research fellowship to G.H. Bechara and M.I. Camargo-Mathias.

Conflict of interest

None.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Patrícia Rosa de Oliveira
    • 1
  • Izabela Braggião Calligaris
    • 1
  • Gislaine Cristina Roma
    • 1
  • Gervásio Henrique Bechara
    • 2
  • Maria Izabel Camargo-Mathias
    • 1
    Email author
  1. 1.Institute of BiosciencesSao Paulo State University-UNESPRio ClaroBrazil
  2. 2.Faculty of Agronomic and Veterinary SciencesUNESPJaboticabalBrazil

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