In vitro efficacy of two commercial products of metarhizium anisopliae s.L. for controlling the cattle tick rhipicephalus microplus

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Abstract

The effects of two different products-Metarril® SP Organic (dry conidia) and Metarril® SC Organic (emulsifiable concentrated conidia in vegetable oil)-on eggs, larvae and Rhipicephalus microplus engorged females were here explored. Three concentrations (108, 107, and 106 conidia mL-1) for both products were prepared in water + 0.1% Tween® 80 (v/v); afterward, bioassays were carried out for all R. microplus stages by immersion in suspensions (Metarril® SP) or formulations (Metarril® SC). Metarril® SP suspensions showed low efficacy and did not affect biological parameters of treated engorged females; for eggs and larvae, only slight decreases in hatchability and larvae population were observed. Despite a delay in germination, Metarril® SC presented better results; for females, reductions in Egg Mass Weight (EMW) and Egg Production Index (EPI) were reported. On eggs, 108 conidia mL-1 increased Incubation Period (IP), shortened Hatching Period (HP) and decreased hatchability by up to 61%; for larvae, 107 and 108 conidia mL-1 reached 99.6 and 100% larval mortality respectively, 10 days after fungal exposure. Thus, further studies involving the use of oil-based formulations for ticks such as Metarril® SC need to be performed, especially to control the most susceptible stages (eggs and larvae).

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Nogueira, M. R. dos S., Camargo, M. G., Rodrigues, C. J. B. C., Marciano, A. F., Quinelato, S., de Freitas, M. C., … Bittencourt, V. R. E. P. (2020). In vitro efficacy of two commercial products of metarhizium anisopliae s.L. for controlling the cattle tick rhipicephalus microplus. Revista Brasileira de Parasitologia Veterinaria, 29(2), 1–8. https://doi.org/10.1590/S1984-29612020035

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