scholarly journals Factors associated with the efficiency of acaricides on different populations of Rhipicephalus microplus

2019 ◽  
Vol 56 (3) ◽  
pp. e157595
Author(s):  
Michel Menin ◽  
Carolain Xavier ◽  
Mauricio Francisco Grigolo ◽  
Kaio Fernando Molosse ◽  
Michele Helena Weirich ◽  
...  
Keyword(s):  
Ixodid Tick ◽  
Tick Control ◽  
Economic Losses ◽  
Cattle Tick ◽  
Sample Collection ◽  
Contributing Factors ◽  
Santa Catarina ◽  
History Of ◽  
Different Populations ◽  
Control And Management

Tick infestation causes major problems in cattle. Tick parasitism accounts for significant economic losses in many beef and dairy herds in the vast majority of the states in the Brazilian territory including the State of Santa Catarina in the southern region of the country. Tick resistance to several active principles occurs due to a number of factors including the indiscriminate, injudicious and inadequate use of tick insecticides. Considering the great importance of fighting off tick infestations in cattle, we evaluated the efficiency of 8 different topical active principles against the ixodid tick R. microplus and identified the main factors that contribute to the development of ticks that are resistant to acaricides in the farms and bovine herds studied. For such purpose, R. microplus telegionae were collected in 39 farms locates in different municipalities of the West of Santa Catarina, south Brazil. At the time of sample collection, information about the management, the history of the acar used in the herd, the number of annual applications of these pesticides, the frequency of acaricide rotation, and the frequency of technical monitoring for strategic tick control were retrieved. We collected this data in order determine contributing factors to the development resistant R. microplus populations. For the sensitivity profile of these ticks to a number of different acaricides tested, 10 engorged females for each principle and a control were used. The results of our study show that most associations between pyrethroids and organophosphates had an efficiency between 96.6% and 100% in the control of R. microplus except for the combination of Alfacipermetrine 15%, Ethion 16%, and Chlorpyrifos 8.5% that had 93.4% of efficiency. Among the chemicals not associated with any other type of compound, Amitraz 12.5% ​​was effective in 98.3% of the cases. In contrast, Cypermethrin 15% had an efficiency in only 25.8% of the farms/herds analyzed. Based on the results of the present study, we may infer that the methods of control and management used by producers may be related to the low indexes of resistance to topical acaricides in the different populations of ticks in the study area.

scholarly journals Comparative Hemolymph Proteomic and Enzymatic Analyses of Two Strains of Rhipicephalus (Boophilus) microplus Ticks Resistant and Susceptible to Ixodicides

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
H. Aguilar-Díaz ◽  
M. Esquivel-Velázquez ◽  
R. E. Quiroz-Castañeda ◽  
E. Miranda-Miranda ◽  
R. J. P. Conde-Baeye ◽  
...  
Keyword(s):  
Tick Control ◽  
Boophilus Microplus ◽  
Economic Losses ◽  
Cattle Tick ◽  
2D Electrophoresis ◽  
Major Threat ◽  
Hemolymph Protein ◽  
Boophilus Microplus Ticks ◽  
Insight Into ◽  
New Strategies

The cattle tick Rhipicephalus (Boophilus) microplus is one of the most harmful ectoparasites affecting bovines worldwide. It represents a major threat to livestock industry due to the economic losses caused and diseases associated with these ticks. The most important tick control strategy has been the use of ixodicides, resulting in chemically resistant tick populations. It is necessary to understand the mechanisms that result in resistance so as to create new strategies increasing the lifespan of ixodicides or finding alternative targets to produce new acaricides. In this paper, in order to obtain an insight into the mechanisms that govern ixodicides resistance, we will compare the hemolymph proteome of two tick R. microplus strains, one susceptible (MJ) and one resistant (SA) to ixodicides, using HPLC and 2D electrophoresis. Significant differences were found in protein content between strains using HPLC. 2D electrophoresis revealed that 68 hemolymph protein spots were common between strains; however, 26 spots were unique to the susceptible strain MJ and 5 to the resistant strain SA. The most distinctive protein spots on the preparative gels were selected for further analyses. Nine protein spots were identified by mass fingerprinting, 
revealing proteins that may have a role in the ixodicides resistance or susceptibility. In this paper, we present the tick hemolymph proteome revealing a set of proteins which suggest a possible role in tick detoxification.

scholarly journals First Report of Cattle Tick Rhipicephalus (Boophilus) annulatus in Egypt Resistant to Ivermectin

Insects ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 404 ◽  
Author(s):  
Saeed El-Ashram ◽  
Shawky M. Aboelhadid ◽  
Asmaa A. Kamel ◽  
Lilian N. Mahrous ◽  
Magdy M. Fahmy
Keyword(s):  
Immersion Test ◽  
Tick Control ◽  
Cattle Tick ◽  
First Report ◽  
Significant Difference ◽  
History Of ◽  
Rhipicephalus Annulatus ◽  
Almost All ◽  
Lower Slope ◽  
Egg Fertility

Tick control is mainly dependent on the application of acaricides, but resistance has developed to almost all classes of acaricides, including macrolactones. Therefore, we aimed to investigate ivermectin resistance among tick populations in middle Egypt. The larval immersion test was conducted using a commercial formulation of ivermectin (1%). Different concentrations of the immersion solution (0.0000625% (625 × 10−7%), 0.000125% (125 × 10−6%), 0.0005% (5 × 10−4%), 0.001% (1 × 10−3%), 0.0025% (2.5 × 10−3%), 0.005% (5 × 10−3), and 0.01% (1 × 10−2%)) were prepared by diluting a commercial ivermectin (1%) with distilled water containing 1% (v/v) ethanol and 2% (v/v) TritonX-100. Field populations of Rhipicephalus annulatus were collected from five different localities in Beni-Suef province, Egypt. Adult engorged female ticks were collected and assessed for oviposition and egg fertility. Eggs were collected, and hatched larvae were then used in the experiment. Application of acaricides was conducted on 10-day-old larvae. There was a significant difference in the LC50 (50% lethal concentration) among the examined localities on the log dose-response plot, where, the LC50 of tick populations from two localities (Emin elaros and Aldiabia) was higher than the other localities (Alhalabia, Alkom, and Beshnna). Besides, tick populations from Emin elaros and Aldiabia showed higher LC90 values with lower slope values compared to those from Alhalabia, Alkom, and Beshnna. According to these values (LC50, LC90, and slope values), as well as a history of acaricide failure to ticks in these areas, R. annulatus developed resistance to ivermectin. This study documents the first report of field populations of R. annulatus resistant to ivermectin in Egypt.

scholarly journals Óleos Essenciais com Atividade Acaricida para Controle de Rhipicephalus (Boophilus) microplus no Brasil

2021 ◽  
Vol 24 (5-esp.) ◽  
pp. 480-488
Author(s):  
Gracieli Gomes Nonato Bressanin ◽  
Andréia Lima Tomé Melo ◽  
Wendell Marcelo de Souza Perinotto
Keyword(s):  
Animal Health ◽  
Tick Control ◽  
Boophilus Microplus ◽  
Economic Losses ◽  
Cattle Tick ◽  
Active Ingredients ◽  
Cattle Breeding ◽  
Pure Compounds ◽  
Low Efficiency ◽  
Pathogenic Agents

No Brasil, a principal espécie de carrapato que compromete a produtividade na criação de bovinos é o ectoparasito hematófago Rhipicephalus (Boophilus) microplus, com perdas econômicas estimadas em aproximadamente 3,24 bilhões de dólares anuais. Tais prejuízos originam-se da perda de sangue do animal, da queda da produtividade, transmissão de agentes infecciosos, baixa eficácia de diversos de produtos carrapaticidas disponíveis no mercado devido ao fenômeno de resistência, entre outros. Este carrapato é vetor dos agentes patogênicos causadores de enfermidades que configura o complexo da tristeza parasitária bovina (TPB). Geralmente, o controle desse parasito ocorre através de acaricidas químicos convencionais. Todavia, o uso indiscriminado desses produtos tem acelerado no processo de seleção de carrapatos resistentes às bases químicas disponíveis. Além disso, existe uma inquietude progressiva relacionada à segurança do meio ambiente e às saúdes humana e animal. Portanto, na busca de novas possibilidades de controle de carrapatos, o emprego de produtos fitoterápicos e biológicos mostra-se como alternativo promissor para o controle. Investigações com plantas para identificar novos princípios ativos capazes de controlar os carrapatos têm sido o foco de extensa pesquisa. Neste estudo, revisou-se o conhecimento atual disponível sobre óleos essenciais (OEs) testados no Brasil como acaricidas sobre R. microplus. Além disso, analisou-se a eficácia de compostos puros isolados dos OEs com potencial atividade acaricida, incluindo as implicações inerentes à aplicação dos OEs como ativos presentes em formulações que poderiam estar disponíveis no mercado. Contudo, considerou-se também a possibilidade de associações dos OEs a agentes utilizados no controle biológico.   Palavras-chave: Carrapato dos Bovinos. Controle. Óleo essencial.   Abstract In Brazil, the main species of tick that compromises productivity in cattle breeding is the hematophagous ectoparasite Rhipicephalus (Boophilus) microplus, with economic losses estimated at approximately 3.24 billion dollars annually. Such losses originate from the blood loss of the animal, from the fall in productivity, transmission of infectious agents, low efficiency of several of the tick products available on the market due to the phenomenon of resistance, among others. This tick is a vector of pathogenic agents that cause diseases that make up the tick-borne diseases complex. Generally, the control of this parasite occurs through conventional chemical acaricides. However, the indiscriminate use of these products has accelerated the process of selecting ticks resistant to the available chemical bases. In addition, there is a progressive concern regarding the safety of the environment and human and animal health. Therefore, in the search for new possibilities for the control of ticks, the use of herbal and biological products is promising alternatives for control. Investigations with plants to identify new active ingredients capable of controlling ticks have been the focus of extensive research. In this study, the current available knowledge about essential oils (EOs) tested in Brazil as acaricides on R. microplus was reviewed. In addition, the effectiveness of pure compounds isolated from EOs with potential acaricidal activity was analyzed, including the implications inherent to the application of EOs as active ingredients in formulations that could be available on the market. However, the possibility of associating EOs with agents used in biological control was also considered.   Keywords: Cattle tick. Control. Essential oil.

scholarly journals Analysis of Bm86 conserved epitopes: is a global vaccine against Cattle Tick Rhipicephalus microplus possible?

2018 ◽  
Author(s):  
Isabella Maiumi Zaidan Blecha ◽  
Bárbara Guimarães Csordas ◽  
André de Abreu Rangel Aguirre ◽  
Rodrigo Casquero Cunha ◽  
Marcos Valério Garcia ◽  
...  
Keyword(s):  
Control Method ◽  
Phylogenetic Analyses ◽  
Rhipicephalus Microplus ◽  
Economic Losses ◽  
Antigenic Determinants ◽  
Cattle Tick ◽  
Universal Vaccine ◽  
Cattle Ticks ◽  
Geographical Regions ◽  
Different Populations

Abstract The cattle tick Rhipicephalus microplus causes significant economic losses in agribusiness. Control of this tick is achieved mainly through the application of chemical acaricides, often resulting in contamination of animal food products and of the environment. Another major concern associated with acaricide use is the increasing reports of resistance of this tick vector against the active ingredients of many commercial products. An alternative control method is vaccination. However, the commercially available vaccine based on a protein homologous to Bm86 exhibits variations in efficacy relative to the different geographical locations. This study aimed to identify antigenic determinants of the sequences of proteins homologous to Bm86. Phylogenetic analyses were performed to determine the extent of divergence between different populations of R. microplus to identify the sequence that could be used as a universal vaccine against the multiple geographically distinct populations of R. microplus and related tick species. Considering the extensive sequence and functional polymorphism observed among strains of R. microplus from different geographical regions, we can conclude that it may be possible to achieve effective vaccination against these cattle ticks using a single universal Bm86-based antigen.

scholarly journals Innovative granular formulation of Metarhizium robertsii microsclerotia and blastospores for cattle tick control

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Allan Felipe Marciano ◽  
Gabriel Moura Mascarin ◽  
Renato Felipe Ferreira Franco ◽  
Patrícia Silva Golo ◽  
Stefan T. Jaronski ◽  
...  
Keyword(s):  
Soil Surface ◽  
Tick Control ◽  
Outdoor Environment ◽  
Economic Losses ◽  
Cattle Tick ◽  
Cattle Industry ◽  
Metarhizium Robertsii ◽  
Promising Tool ◽  
Urochloa Decumbens ◽  
The Impact

AbstractThe tick Rhipicephalus microplus poses a serious threat to the cattle industry, resulting in economic losses aggravated by tick resistance to chemical acaricides. Strains of Metarhizium spp., a well-known group of entomopathogenic fungi, can contribute to managing this ectoparasite. We explored two novel granular, microsclerotia- or blastospores-based formulations of Metarhizium robertsii for R. microplus control under semi-field conditions. Fungal persistence in soil was also observed for 336 days. The experiment used pots of Urochloa decumbens cv. Basilisk grass, treated with 0.25 or 0.5 mg of granular formulation/cm2 (25 or 50 kg/ha) applied to the soil surface prior to transferring engorged tick females onto the treated soil. The fungal granules yielded more conidia with subsequent sporulation under controlled indoor conditions than in the outdoor environment, where the levels of fungus rapidly declined over time. Metarhizium-root colonization ranged from 25 to 66.7% depending on the propagule and rate. Fungal formulations significantly reduced the number of tick larvae during the humid season, reaching at least 64.8% relative efficacy. Microsclerotia or blastospores-granular formulations of M. robertsii can reduce the impact of R. microplus, and thus prove to be a promising tool in the control of ticks.

scholarly journals Acaricide activity of leaves extracts of Sambucus australis Schltdl. (Caprifoliaceae) at 2% on engorged females of Rhipicephalus (Boophilus) microplus

2011 ◽  
Vol 41 (12) ◽  
pp. 2159-2163 ◽  
Author(s):  
Felipe da Silva Krawczak ◽  
Andréia Buzatti ◽  
Felipe Lamberti Pivoto ◽  
Luís Antônio Sangioni ◽  
Fernanda Silveira Flores Vogel ◽  
...  
Keyword(s):  
Folk Medicine ◽  
Ethanol Extract ◽  
Immersion Test ◽  
Tick Control ◽  
Boophilus Microplus ◽  
Economic Losses ◽  
Cattle Tick ◽  
Active Metabolites ◽  
Parasite Infections

Parasite infections caused by Rhipicephalus (Boophilus) microplus are responsible for the most of economic losses in producing-cattle countries in tropical and subtropical areas. Indiscriminate uses of chemical acaricides have contributed with the appearance of tick resistance to many drugs available in the marketplace, and it is a serious problem in the tick control. Flowers of Sambucus australis (South America), called "sabugueiro-from-Brazil", are used on infusions or decoctions forms in the folk medicine with diuretic, antipyretic, anti-inflammatory, and laxative purpose, also employed for treating respiratory diseases in human. The main goal of this study was to evaluate in vitro potential of S. australis leaves extracts as an acaricide agent. Ethanol extract at 70% has been dehydrated and a fraction was suspended in 70% ethanol or in distillated water at final concentration of 2% (0.2mg-1). Using the immersion test of engorged females the efficiency results were obtained in 34% and 66% with the leaves extract diluted in water and 70% ethanol, respectively. This study is the first report on acaricidal activity of S. australis against cattle tick. Further studies to determine the active metabolites in different stages of S. australis could aid to identify suitable extracts to be tested in the R. (B.) microplus control.

Clinical and anamnestic characteristics of patients with adenomyosis, accompanied by pelvic pain syndrome

GYNECOLOGY ◽  
2018 ◽  
Vol 20 (6) ◽  
pp. 77-80
Author(s):  
M R Orazov ◽  
V E Radzinsky ◽  
M B Khamoshina ◽  
A O Dukhin ◽  
L R Toktar ◽  
...  
Keyword(s):  
Pelvic Pain ◽  
Chronic Pelvic Pain Syndrome ◽  
Pain Syndrome ◽  
Reproductive Age ◽  
Pelvic Pain Syndrome ◽  
Common Disease ◽  
Contributing Factors ◽  
High Prevalence ◽  
Inflammatory Processes ◽  
History Of

Pelvic pain syndrome associated with adenomyosis is a common disease in women of reproductive age. Frequency of detection in the population varies from 10 to 53%. The aim - to study the clinical and anamnestic risk factors of pelvic pain, with adenomiose. Materials and methods. The study included 120 (n=120) patients with diffuse adenomyosis with pain and painless form of the disease who underwent examination and treatment in the gynecological Department of the Central clinical hospital №6 of Russian Railways in Moscow. Each patient was provided with an individual card, which was encrypted 171 sign. The studied parameters reflected the passport and anthropometric data, information about education, social status, presence of occupational hazards, complaints, illness. Results. Burdened gynecological and somatic histories, manifested a low health index, a more pronounced hereditary a family history of neoplastic diseases are contributing factors, and high prevalence of postponed surgeries, chronic, long-term ongoing inflammatory processes of the pelvic organs to create a favorable background for the further progression of chronic pelvic pain syndrome in adenomiose.

CLIMATOLOGY OF EXTREME RAINFALL EVENTS IN EASTERN AND NORTHERN SANTA CATARINA STATE, BRAZIL: PRESENT AND FUTURE CLIMATE

2013 ◽  
Vol 31 (3) ◽  
pp. 413 ◽  
Author(s):  
André Becker Nunes ◽  
Gilson Carlos Da Silva
Keyword(s):  
Climate Model ◽  
Climate Modeling ◽  
Linear Trend ◽  
Extreme Rainfall ◽  
Eastern Region ◽  
Santa Catarina ◽  
Extreme Rainfall Events ◽  
Rainfall Events ◽  
History Of ◽  
Santa Catarina State

ABSTRACT. The eastern region of Santa Catarina State (Brazil) has an important history of natural disasters due to extreme rainfall events. Floods and landslides are enhancedby local features such as orography and urbanization: the replacement of natural surface coverage causing more surface runoff and, hence, flooding. Thus, studies of this type of events – which directly influence life in the towns – take on increasing importance. This work makes a quantitative analysis of occurrences of extreme rainfall events in the eastern and northern regions of Santa Catarina State in the last 60 years, through individual analysis, considering the history of floods ineach selected town, as well as an estimate through to the end of century following regional climate modeling. A positive linear trend, in most of the towns studied, was observed in the results, indicating greater frequency of these events in recent decades, and the HadRM3P climate model shows a heterogeneous increase of events for all towns in the period from 2071 to 2100.Keywords: floods, climate modeling, linear trend. RESUMO. A região leste do Estado de Santa Catarina tem um importante histórico de desastres naturais ocasionados por eventos extremos de precipitação. Inundações e deslizamentos de terra são potencializados pelo relevo acidentado e pela urbanização das cidades da região: a vegetação nativa vem sendo removida acarretando um maior escoamento superficial e, consequentemente, em inundações. Desta forma, torna-se de suma importância os estudos acerca deste tipo de evento que influencia diretamente a sociedade em geral. Neste trabalho é realizada uma análise quantitativa do número de eventos severos de precipitação ocorridos nas regiões leste e norte de Santa Catarina dos últimos 60 anos, por meio de uma análise pontual, considerandoo histórico de inundações de cada cidade selecionada, além de uma projeção para o fim do século de acordo com modelagem climática regional. Na análise dos resultados observou-se uma tendência linear positiva na maioria das cidades, indicando uma maior frequência deste tipo de evento nas últimas décadas, e o modelo climático HadRM3P mostra um aumento heterogêneo no número de eventos para todas as cidades no período de 2071 a 2100.Palavras-chave: inundações, modelagem climática, tendência linear.

scholarly journals Prevalence of mastitis in Nigerian livestock: a Review

2020 ◽  
Vol 1 (1) ◽  
pp. 20-29
Author(s):  
Hussaini Ojagefu Adamu ◽  
Rahimat Oshuwa Hussaini ◽  
Cedric Obasuyi ◽  
Linus Irefo Anagha ◽  
Gabriel Oscy Okoduwa
Keyword(s):  
Control Strategies ◽  
Dairy Farms ◽  
Livestock Production ◽  
Sub Saharan Africa ◽  
Economic Losses ◽  
Ecological Development ◽  
Management Plans ◽  
Sub Saharan ◽  
Control And Management ◽  
The Impact

AbstractMastitis is a disease of livestock that directly impede livestock production and thus hindering the socio-ecological development of sub-Saharan Africa. Studies have estimated the prevalence of this disease in 30% of Africa countries, with Ethiopia having the highest prevalence. The coverage is low, despite the wide livestock and dairy farms distribution in Africa. Furthermore, estimated economic losses due to the impact of mastitis are lacking in Nigeria. The disease is endemic in Nigeria as indicated by the available data and there are no proposed management plans or control strategies. This review is thus presented to serve as a wakeup call to all parties involved to intensify efforts towards the diagnosis, control, and management of the disease in Nigeria.

scholarly journals Efficacy of two commercial synthetic pyrethroids (cypermethrin and deltamethrin) on Amblyomma variegatum and Rhipicephalus microplus strains of the south-western region of Burkina Faso

2021 ◽  
Vol 53 (3) ◽  
Author(s):  
Achille S. Ouedraogo ◽  
Olivier M. Zannou ◽  
Abel S. Biguezoton ◽  
Kouassi Yao Patrick ◽  
Adrien M. G. Belem ◽  
...  
Keyword(s):  
Burkina Faso ◽  
Pyrethroid Resistance ◽  
Tick Control ◽  
Rhipicephalus Microplus ◽  
Amblyomma Variegatum ◽  
Synthetic Pyrethroid ◽  
Cattle Tick ◽  
Control Problems ◽  
Synthetic Pyrethroids ◽  
Western Region

AbstractSince 2011, period of the livestock invasion by the cattle tick Rhipicephalus microplus in Burkina Faso (BF), tick-control problems were exacerbated. Based on farmer’s reports, most commonly used commercial acaricides were found to be ineffective in Western South part of the country. To investigate the occurrence and extent of such acaricidal ineffectiveness, we performed the standardized larval packet test (LPT) with commercial deltamethrin (vectocid) and cypermethrin (cypertop), on two cattle tick species, the native Amblyomma variegatum and the invasive R. microplus. The resistance ratios (RR) were computed with susceptible Hounde strain of Rhipicephalus geigyi as reference. The R. microplus population showed resistance to the two acaricides tested with the highest lethal concentration (LC) values, and different resistance ratios higher than 4 (deltamethrin: RR50 = 28.18 and RR90 = 32.41; cypermethrin: RR50 = 8.79 and RR90 = 23.15). In the contrary, A. variegatum population was found to be highly susceptible to acaricides tested with low lethal concentrations and resistance ratio values (deltamethrin: RR50 = 0.5 and RR90 = 0.48; cypermethrin: RR50 = 0.68 and RR90 = 0.79). These data demonstrate high synthetic pyrethroid resistance in R. microplus strain, leading to conclude that the acaricide ineffectiveness in tick populations control remains a concern in BF.

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