In vitro evaluation of the effects of some acaricides on life stages of Rhipicephalus sanguineus (Acari: Ixodidae)

Bicalho, Kelly Alves; Ferreira, Fabiene; Borges, Lígia Miranda Ferreira; Ribeiro, Múcio Flávio Barbosa

doi:10.1590/s0102-09352001000500006

Cited by 24 publications

(9 citation statements)

References 3 publications

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“…The ticks from group II (CT) showed a reduction of 0.13% than the ticks of group I (control). This very high level of reduction in the RI may be due to direct effect of cypermethrin (Bicalho et al 2001). Although cypermethrin has direct toxic effect on challenged ticks and not allowed ticks to feed on treated animals more than 3 days.…”

Section: Discussionmentioning

confidence: 96%

Comparative efficacy of Annona squamosa and Azadirachta indica extracts against Boophilus microplus Izatnagar isolate

2009

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In the search of developing herbal acaricides, eight medicinal plants were screened for their efficacy against Boophilus microplus, the widely distributed tick species in India. Of the seven extracts screened, the extracts prepared from the Annona squamosa seed showed very high level of efficacy (70.8%) after 24 h of treatment. The effect of treatment on oviposition of the survived ticks was also assessed, and a significant reduction (P < 0.05) in the reproductive index was noted in comparison to control. When efficacy of the in vitro optimized concentration of A. squamosa was compared with previously tested extract of Azadirachta indica in in vivo model, it was observed that the extracts prepared from A. indica is more efficacious than the extracts of A. squamosa. A comparable efficacy against B. microplus fed on animals treated with herbal extracts and commonly used synthetic acaricide was noted. The possibility of using the herbal extracts in IPM format for the management of ticks is discussed.

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Section: Discussionmentioning

confidence: 96%

Comparative efficacy of Annona squamosa and Azadirachta indica extracts against Boophilus microplus Izatnagar isolate

2009

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“…Some methods are under scientific scrutiny, such as vaccines (Péter and Brossard 1998), natural predators as the cattle egret, Bubulcus ibis (Alves-Branco et al 1983), the application of pheromones (De Bruyne and Guerin 1994), fungi Metarhizium anisopliae (Costa et al 2002;Tellam et al 1992;Willadsen 1997) and, most frequently, the use of synthetic or natural substances with acaricide action. Examples of synthetic acaricides are the cypermethrin, amitraz (Bicalho et al 2001) and the permethrin (Melo et al 2008). The most important natural acaricides are the neem oil (Denardi et al 2010;Remedio et al 2015), andiroba oil (Roma et al 2013(Roma et al , 2015Vendramini et al 2012) and the castor oil esters (Arnosti et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Deltamethrin as inductor agent of precocious ovarian degeneration in Rhipicephalus sanguineus s.l. (Acari: Ixodidae) ticks

et al. 2017

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The cosmopolitan species Rhipicephalus sanguineus s.l. is one of the most widely distributed ticks all over the world. These ectoparasites are vectors of several pathogens and cause significant direct damage to their hosts. The biological success of these ectoparasites has been attributed to their ovaries and salivary glands, organs that ensure their survival in various environmental conditions. The importance of the ovaries in ticks is that, after mating, the individuals are able to lay approximately three thousand eggs. The present study had the objective to demonstrate the effects of deltamethrin obtained from the product Butox P CE 25 (MSD Saúde Animal, São Paulo, Brazil) on the ovarian development of R. sanguineus s.l. females. The chemical was tested in the concentrations of 25, 50, 100 and 200 ppm (respectively 80, 40, 20 and 10 times lower than the recommended by the manufacturer). Through the application of histological techniques and HE staining, the results showed that the deltamethrin was potentially able to modify the morphophysiology of the oocytes in all developmental stages, interfering in the vitellogenesis, causing intense vacuolation, cytoplasmic disorganization, and alterations in the chorion secretion. In addition, the chemical affected the germ vesicle of some oocytes, causing damages and hypertrophy, fragmenting the chromatin and forming bodies strongly stained by hematoxylin. Therefore, this study confirmed that the deltamethrin had an important action on the reproductive system of the R. sanguineus s.l. females, causing the precocious structural disorganization of the germ cells, consequently preventing the generation of new individuals.

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“…In I. ricinus, 41.14% of normal larvae hatched at the 0.03125% concentration of deltamethrin and complete inhibition of larval hatch was noted at the concentration of 0.0625% of this substance. 0.01% cis-cypermethrin, 0.015% cypermethrin, and 0.0025% deltamethrin inhibited larval hatch in R. sanguineus in 72.1, 67.3, and 42.0%, respectively (Bicalho et al 2001).…”

Section: Discussionmentioning

confidence: 95%

The effect of sublethal concentrations of deltamethrin and alphacypermethrin on the fecundity and development of Ixodes ricinus (Acari: Ixodidae) eggs and larvae

et al. 2019

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Two pyrethroids, deltamethrin (D) and alphacypermethrin (AC), have been used as commercial products for tick control worldwide. However, the effects of sublethal doses of these compounds on various tick species and their developmental stages have not been fully explored yet, although such knowledge could contribute to a more effective application of both pyrethroids and simultaneous reduction of their costs and undesirable side effects, including the harmful impact on other organisms and environmental contamination. This study investigates the effect of sublethal concentrations of D and AC applied to engorged females on the fecundity, development of eggs and larvae, and the number of offspring in the Ixodes ricinus (L.) tick, which is the most important vector of tick-borne diseases of humans in Europe. After detachment from rabbit's skin, fully engorged I. ricinus females were treated with 20 μl of pyrethroid solutions at five concentrations from 0.01562 to 0.25% and kept at 28 °C and 75% relative humidity. The impact of the pyrethroids on maturation and development of eggs as well as development of larvae was assessed based on parameters of the preoviposition and oviposition periods and the course of embryogenesis and egg hatch. The investigations have shown that both tested acaricides reduce the reproductive rate in I. ricinus females by inhibition of egg development and disturb embryonic development and larval hatch. Females did not lay eggs at concentrations higher than 0.0625% AC and 0.125% D. The lower concentrations of both pyrethroids disturbed or inhibited the embryogenesis and egg hatch in I. ricinus.

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In vitro evaluation of the effects of some acaricides on life stages of Rhipicephalus sanguineus (Acari: Ixodidae)

Cited by 24 publications

References 3 publications

Comparative efficacy of Annona squamosa and Azadirachta indica extracts against Boophilus microplus Izatnagar isolate

Comparative efficacy of Annona squamosa and Azadirachta indica extracts against Boophilus microplus Izatnagar isolate

Deltamethrin as inductor agent of precocious ovarian degeneration in Rhipicephalus sanguineus s.l. (Acari: Ixodidae) ticks

The effect of sublethal concentrations of deltamethrin and alphacypermethrin on the fecundity and development of Ixodes ricinus (Acari: Ixodidae) eggs and larvae

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