Comparative Results of Action of Natural and Synthetic Acaricides in Reproductive and Salivar Systems of Rhipicephalus sanguineus - Searching by a Sustainable Ticks Control

Mathias, Maria Izabel Camargo

doi:10.5772/29127

Insecticides - Advances in Integrated Pest Management 2012

DOI: 10.5772/29127

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Comparative Results of Action of Natural and Synthetic Acaricides in Reproductive and Salivar Systems of Rhipicephalus sanguineus - Searching by a Sustainable Ticks Control

Maria Izabel Camargo Mathias¹

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2014

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References 26 publications

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Histopathological study of ovaries of Rhipicephalus sanguineus (Acari: Ixodidae) exposed to different thymol concentrations

et al. 2014

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Thymol is a monoterpene with proven acaricide action for several tick species. In addition to killing these ectoparasites, thymol can also reduce oviposition and egg hatch rate. However, the effects of thymol on the morphophysiology of tick ovaries are still unknown. Thus, the aim of this study was to evaluate the morphophysiological changes caused by this active principle in ovaries of Rhipicephalus sanguineus after a 6-day feeding period, through the application of morphohistochemical techniques. After the feeding period, a total of 50 females were divided into five groups and immersed in the following solutions: (I) distilled water (control), (II) 30% ethanol (control), (III) 1.25 mg/mL thymol, (IV) 2.5 mg/mL thymol, and (V) 5.0 mg/mL thymol. The experimental groups were kept in a climatic chamber (27 ± 1 °C; RH 80 ± 10%) for 5 days. After this period, morphological (hematoxylin/eosin) and histochemical (von Kossa) techniques were applied after remotion of the ovaries. The morphological results revealed large vacuoles in germ cells at different developmental stages and invaginations that represent deformations in the chorionic membrane. From the results obtained in this study, it was concluded that thymol interfered with the development of oocytes, which showed degeneration signs. The treatment containing 5.0 mg/mL thymol affected more accentuately the morphological development. Moreover, thymol also altered the calcium content of yolk granules, which generally showed an intense staining for this element.

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Histopathological study of ovaries of Rhipicephalus sanguineus (Acari: Ixodidae) exposed to different thymol concentrations

et al. 2014

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Comparative Results of Action of Natural and Synthetic Acaricides in Reproductive and Salivar Systems of Rhipicephalus sanguineus - Searching by a Sustainable Ticks Control

Cited by 1 publication

References 26 publications

Histopathological study of ovaries of Rhipicephalus sanguineus (Acari: Ixodidae) exposed to different thymol concentrations

Histopathological study of ovaries of Rhipicephalus sanguineus (Acari: Ixodidae) exposed to different thymol concentrations

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