| Full text | |
| Author(s): |
de Oliveira, Patricia Rosa
[1]
;
Calligaris, Izabela Braggiao
[1]
;
Roma, Gislaine Cristina
[1]
;
Bechara, Gervasio Henrique
[2]
;
Camargo-Mathias, Maria Izabel
[1]
Total Authors: 5
|
| Affiliation: | [1] Sao Paulo State Univ UNESP, Inst Biosci, BR-13506900 Rio Claro, SP - Brazil
[2] UNESP, Fac Agron & Vet Sci, BR-14884900 Jaboticabal, SP - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Parasitology Research; v. 112, n. 1, p. 45-58, JAN 2013. |
| Web of Science Citations: | 4 |
| Abstract | |
The present study demonstrated the effects of the arthropod growth regulator, fluazuron (Acatak (R)), 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. (AU) | |