Volume 100, June 2015, Pages 165–168
Acaricidal activity of extracts from the leaves and aerial parts of Neoglaziovia variegata (Bromeliaceae) on the cattle tick Rhipicephalus (Boophilus) microplus
Highlights
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- We evaluated the acaricidal activity of leaves and aerial parts of N. variegata.
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- The extracts were tested in females by adult immersion test.
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- The hatching eggs percentage, oviposition inhibition and efficacy were evaluated.
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- The hexane extract showed the best results in all parameters evaluated.
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- The other fractions can be used for auxiliary control of ticks.
Abstract
This experiment was carried out to study the bioacaricidal activity of Neoglaziovia variegata against engorged females of Rhipicephalus (Boophilus) microplus.
The mortality and fecundity of groups of engorged adult females exposed
to different concentrations of ethanol, hexane, chloroform, and ethyl
acetate extracts obtained from the leaves and aerial parts of N. variegata
were evaluated, using three treatments with concentrations of 5, 10 e
25 mg/ml; two controls (distilled water and distilled water with drops
of cremophor); with three replicates. The hexane extract of the leaves
demonstrated significant results, presenting 94.1% inhibition of
oviposition; 0.33% the average percentage of eclosion of eggs; and 99.8%
of effectiveness. These results indicate N. variegata, particularly the hexane extract of leaves, as potential alternative control agents of R. (B.) microplus. Pharmacological and chemical studies are continuing in order to characterize the mechanism responsible for this effect.
Keywords
- Tick;
- Control;
- Acaricide;
- Plant extract;
- Caatinga
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