Sensibilidade do carrapato Boophilus microplus a solventes Sensibility of Boophilus microplus tick to solvents. Directory of Open Access Journals Sweden. Experiments carried out with synthetic or natural acaricides usually use a solvent. To investigate the sensitivity of Boophilus microplus cattle tick to different solvents, larvae and engorged female were subjected to seven solvents in five different concentrations. It was done in the presence and absence of olive oil. The results showed that the utilization of olive oil doesn't produce different statistical results in impregnated paper larvae test.

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Sensibilidade do carrapato Boophilus microplus a solventes Sensibility of Boophilus microplus tick to solvents. Directory of Open Access Journals Sweden. Experiments carried out with synthetic or natural acaricides usually use a solvent.

To investigate the sensitivity of Boophilus microplus cattle tick to different solvents, larvae and engorged female were subjected to seven solvents in five different concentrations. It was done in the presence and absence of olive oil. The results showed that the utilization of olive oil doesn't produce different statistical results in impregnated paper larvae test.

It did not happen in adults immersion test with hydrophilic compounds. The mean mortality caused by solvents was small in impregnated paper larvae test, increasing in immersion tests of larvae and adults. Solvents with low molecular weight and viscosity like ethyl alcohol and methyl alcohol did not cause interference in the mortality of B. A description of the drop-off behaviour of engorged females of the tick Boophilus microplus was carried out as a result of an experiment at the Experimental Station, Embrapa Gado de Leite, Coronel Pacheco, MG, Brazil.

Its objective was to evaluate any repercussions of changing the time of milking of cattle in terms of reduced recontamination of the pastures with the tick. Such possible changes in this daily cattle management routine have recently become a reality since the advent of refrigerated on-farm storage of the milk and non-daily collection by tanker truck. The field experiment. The products were obtained through the camphor and isopinocamphone clorosulfonation.

Thirty-three products were submitted to solubilization and tested alone and together, against tick larvae. Ticks were caught in filter paper envelopes impregnated with products, which were incubated under controlled conditions.

The 33 products tested in the biological screening could not be considered as potential acaricides. Perspectives for the use of plant extracts to control the cattle tick Rhipicephalus Boophilus microplus Perspectivas para o uso de extratos de plantas para o controle do carrapato de bovinos Rhipicephalus Boophilus microplus. Full Text Available The evolution of resistance of Rhipicephalus Boophilus microplus to synthetic acaricides has given rise to the need for new scientific investigations on alternative ways to control this tick.

In this regard, various studies on plants have been developed in an attempt to find extracts with acaricidal properties. Evaluations on plant extracts for controlling R. There are many advantages from using plant extracts: for example, they can be used in organic cattle farming or even replace synthetic acaricides and they are associated with lower environmental and food contamination, slower development of resistance and lower toxicity to animals and humans.

In vitro studies on plant extracts have shown promising results, but most of these extracts have not been tested on animals to validate their use. Difficulties in preparing proper formulations, differences in the chemical composition of plants of the same species due to extrinsic and intrinsic factors and sparse information on active acaricide compounds are hindrances that need to be addressed in order to enable progress within this scientific field. The indiscriminate use of chemical products to control the cattle tick is the main cause of the gradual increase in the number of strains of this parasite that are resistant to the bases currently available in the market.

The use of essential oils and plant extracts is an ancient practice for tick control; however, only recently has it received due attention by researchers. The aim of this experiment was to evaluate the in vitro efficacy of lemongrass Cymbopogon citratus essential oil on engorged females of Rhipicephalus Boophilus microplus through immersion test. O controle de B.

The objective of the study was to analyse the control methods of the cattle tick, Boophilus microplus. Farm management, the Bos indicus and Bos taurus composition of herds, climatic factors and seasonal variation in tick infestation level of cattle was taken into account. Counts of engorged female ticks, measuring between 4. In the southern. Full Text Available At present not only is the site of fertilization in ticks still unknown but it is also unclear as to how this mystery can be solved.

Signs of fertilization can be observed throughout the female genital tract and these can be clues for the elucidation of the unsolved questions relating to ticks fertilization. In Boophilus microplus Canestrini, the most important signs are the following: the final eversion of the acrosomal canal in females ready for oviposition; the presence of small tubules, resembling the subplasmalemal process of the spermatozoon between the oviduct cells; budding nuclei throughout the female genital tract; and the two Feulgen and DAPI positive areas in the oocyte at vitelogenesis.

These morphological characteristics suggest that fertilization takes place in the internal cylinder which extends from the uterus to the ovary itself.

This study was developed in the Experimental Station of Embrapa Dairy Cattle, Coronel Pacheco, Minas Gerais, Brazil, and had the aim of verifying the occurrence of intra-specific competition in the cattle tick Boophilus microplus during its parasite life and to confirm the relation between the weight of engorged females and the egg mass laid. Observations were done with cattle naturally and experimentally infested with different quantities of larvae during different intervals of time.

The infested animals remained in individual stalls for the whole period of engorged females drop-off, in order to collect them daily. The observed differences among weight of engorged females during drop-off days suggested the competition occurrence during the feeding phase.

It was also seen that the oviposition potential of an engorged female is directly related to its feeding capacity. Full Text Available The objective of this work was to study the reproductive behavior of two strains of R. Engorged ticks from each strain were collected monthly from February to February These were weighed and kept in the laboratory until egg-laying.

Oogenic masses were individually weighed and incubated until larvae emergence. An analysis of variance and Duncan's multiple rank tests were carried out on the data P O objetivo deste trabalho foi estudar a conduta reprodutiva de duas cepas de R. Full Text Available In the Pantanal, domestic and wild animals share the same habitats; their parasites and environment interact in a complex and dynamic way.

The Rhipicephalus Boophilus microplus is the most important cattle tick in Brazil. In the past two decades, some traditional management practices are being replaced with the aim of intensifying cattle production.

Forested areas are being replaced by exotic pasture and ranch owners are replacing Nelore for European breeds. The pampas deer Ozoctoceros bezoarticus is a medium-sized cervid that occurs in grasslands of South America. Between December and January , we captured and collected ticks from 15 pampas deer and bovines.

Entre dezembro de e janeiro de , foram coletados carrapatos de 20 veados-campeiros e bovinos. Controle de larvas de Boophilus microplus por Metarhizium anisopliae em pastagens infestadas artificialmente Control of Boophilus microplus larvae by Metarhizium anisopliae in artificially infested pastures. The objective of this work was to evaluate the efficiency of Metarhizium anisopliae fungus against Boophilus microplus population in Brachiaria brizantha and Tifton 85 Cynodon pastures, artificially infested with tick engorged females.

Pastures were infested with engorged tick females. Neste estudo, teve-se por objetivo conhecer a suscetibilidade desse carrapato a acaricidas em Mato Grosso do Sul.

Full Text Available The cattle tick Rhipicephalus Boophilus microplus is responsible for great economic losses. It is mainly controlled chemically, with limitations regarding development of resistance to the chemicals.

Vaccines may help control this parasite, thereby reducing tick pesticide use. The subcloning was done in the pPIC9 expression vector, for transformation in the yeast Pichia pastoris.

The serum produced in cattle vaccinated with the antigen CG rBm86 presented high antibody titers and recognized the native protein. The rBmGC has potential relevance as an immunogen for vaccine formulation against cattle ticks. Full Text Available Studies have shown that ticks are susceptible to infection by entomopathogenic nematodes. These studies indicate different susceptibilities of ticks to infection by these fungi, depending on the tick species, development phase, entomopathogenic nematodes species and strains and the time the ticks are exposed to them.

Usually this period ranges from 24 to 72 hours. The aim of this study was to evaluate the infection times in vitro of engorged Rhipicephalus Boophilus microplus females by the entomopathogenic nematodes Steinernema glaseri CCA strain, by analysis of the ticks' biological parameters. The results show that a 2-hour exposure time was sufficient for the engorged R. Immunogenic potential of Rhipicephalus Boophilus microplus aquaporin 1 against Rhipicephalus sanguineus in domestic dogs.

Twenty-one da Nuevos enfoques para el control de Rhipicephalus Boophilus microplus. Further studies on South African plants: Acaricidal activity of organic plant extracts against Rhipicephalus Boophilus microplus Acari: Ixodidae. Full Text Available -1 Veterinary Parasitology, vol. Full Text Available The cattle tick Rhipicephalus Boophilus microplus is responsible for major losses in the Brazilian livestock, mainly due to reduction in cattle productive performance.

Resistance development to major classes of acaricide widely used nowadays has been extensively reported, as well as the occurrence of residues from these compounds in animal products and the environment.

This study aimed to evaluate the efficiency of acaricides on R. Ticks were collected in several cattle farms in the cited region, and an in vitro acaricide efficiency assay was performed based on the immersion of ticks in acaricide solutions made according to manufacturers' recommendations. Annonaceae graviola; flores de Syzygium malaccensis L. Myrtaceae jambo; folhas de Cymbopogon citratus DC.

Stapf Poaceae capim-santo; folhas de Azadirachta indica A. O extrato de A. Plant extracts were studied to evaluate its efficiency in the control of Rhipicephalus Boophilus microplus Canestrini, in laboratory. Engorged female ticks were collected from the cattle, kept in Petri dishes. Annonaceae soursop; flowers of Syzygium malaccensis L. Myrtaceae iamb, leaves of Cymbopogon citratus DC. Stapf Poaceae holy grass, leaves of Azadirachta indica A.

The extract of A. The seed extract of A. Oocysts of Hepatozoon canis in Rhipicephalus Boophilus microplus collected from a naturally infected dog. Canine hepatozoonosis is a tick-borne disease caused by protozoans of the genus Hepatozoon.

Several tick species have been implicated as potential vectors. Therefore, extensive studies are needed to determine the 'natural' endemic cycle of this parasite. This paper presents the first report of the presence of Hepatozoon canis oocysts in Rhipicephalus Boophilus microplus collected from an infected dog.

All rights reserved. Vitellin- and hemoglobin-digesting enzymes in Rhipicephalus Boophilus microplus larvae and females. The aim of the present study was to address the involvement of Rhipicephalus microplus larval cysteine endopeptidase RmLCE in protein digestion in R. In this work, an improved purification protocol for native RmLCE was developed. Partial amino acid sequence of the purified enzyme indicates that it is the same enzyme as Boophilus microplus cathepsin-L1 BmCL1.

When vitellin Vt degradation by egg and larval enzymes was analyzed, stage-specific differences for RmLCE activity in comparison to vitellin-degrading cysteine endopeptidase VTDCE were observed.


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Natural infestation by external parasites in beef cattle females in southern Brazil. Foram feitas de 6 a 10 contagens em cada animal, totalizando 5. It was evaluated in this work, the degree of natural infestation by external parasites in beef cattle females from three genetic groups. It was realized from 6 to 10 countings in each animal, totalizing 5, observations in females at seven physiological stages calf; empty heifers, pregnant heifers, primiparous cows with or without calf; and pluriparous cows, with or without calf. Differences among genetic groups depended on year-season counting; however, in general, Nellore females were the least infected by ticks, and Angus x Nellore females were the most infected by horn flies and by beef-worms. There was a physiological stage effect of the female in all the three studied characteristics and the differences changed accordingly to the trait. Despite of the counting year-season x genetic group, there are differences among Nellore, Canchim x Nelore, Angus x Nellore and Simmental x Nelore genetic groups regarded to the degree of natural infestation by cattle tick, horn fly and beef-worm.


Impacto econômico das parasitoses de bovinos


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