Innovative granular formulation of Metarhizium robertsii microsclerotia and blastospores for cattle tick control
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2021
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The 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-feld 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 signifcantly reduced the number of tick larvae during
the humid season, reaching at least 64.8% relative efcacy. 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.
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MARCIANO, Allan Felipe et al. Innovative granular formulation of Metarhizium robertsii microsclerotia and blastospores for cattle tick control. Scientific Reports, London, v. 11, n. 1, e4972, 2021. DOI: 10.1038/s41598-021-84142-8. Disponível em: https://www.nature.com/articles/s41598-021-84142-8. Acesso em: 11 dez. 2024.