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The association of extracts of Achyrocline satureioides and the fungus Beauveria bassiana against the tick Rhipicephalus microplus

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Abstract

The tick Rhipicephalus microplus (Canestrini) is a major economic hurdle to the global livestock industry. The incorrect and indiscriminate control carried out by synthetic chemical compounds has contributed to the emergence of parasite resistance present today to many products available in the veterinary market. Effective, economically viable and potentially safe alternatives need to be investigated, including herbal medicine and biological control by entomopathogenic fungi. In this study, extracts from Achyrocline satureioides (Lam.) DC. obtained by extraction with solvents of different polarities associated and not associated with the entomopathogenic fungus Beauveria bassiana (Balsamo-Crivelli) Vuillemin were evaluated on different stages of the life cycle of R. microplus. The activity of plant extracts, fungus and their associations in ticks was analyzed in vitro through the adult immersion test, larval packet test and larval immersion test. The highest efficacy on engorged females (43.3%) was reached by the hexanic partition (ASh) at 5 mg/mL + fungus, reducing larval hatchability. ASh associated with B. bassiana also caused high mortality of larvae, reaching LC50 of 6.23 and 2.65 mg/mL in the packet and immersion tests, respectively. The results obtained showed that extracts, when used in combination with the fungus, have their action enhanced, reaching 100% mortality of larvae. Among the evaluated methodologies, it was observed that the larval immersion test allows better assessment, due to the time of contact with the larvae. The results obtained with A. satureioides associated with the fungus are considered promising and open new perspectives for future product development.

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Data Availability

The data sets analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We thank to the National Council for Scientific and Technological Development (CNPq) for the scholarship granted (RRF), the School of Pharmaceutical Sciences of Araraquara (UNESP) and Embrapa Southeastern Livestock Unit for keeping the host donors by the project 20.18.03.017.00.02.002.

Funding

This study was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP, Brazil), Process FAPESP N° 2018/14116-4 and in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001.

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Contributions

RRF: conceived and designed the experiments; performed the experiments; prepared the manuscript; YAG: provided support in collecting and identifying ticks, analyzing the data; AF: provided support in collecting and identifying ticks; RS: performed the experiment; ACSC: provided support in collecting and identifying ticks, analyzing the data, prepared the manuscript. RCLRP: conceived and designed the experiments; analyzing and interpreting data, prepared the manuscript, supervised the study. All authors read, agreed and approved the final manuscript.

Corresponding author

Correspondence to Rosemeire Cristina Linhari Rodrigues Pietro.

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Ethics approval and consent to participate

All procedures of the present study were approved by the Embrapa Pecuária Sudeste Ethics Committee on Animal Experimentation (CEUA process nº. 01/2019).

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The authors declare that they have no competing interests.

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Fantatto, R.R., Gainza, Y.A., Figueiredo, A. et al. The association of extracts of Achyrocline satureioides and the fungus Beauveria bassiana against the tick Rhipicephalus microplus. Exp Appl Acarol 87, 351–363 (2022). https://doi.org/10.1007/s10493-022-00736-5

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  • DOI: https://doi.org/10.1007/s10493-022-00736-5

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