Data/hora: 15/06/2024 09:58:55

Biblioteca(s): 	Embrapa Meio Ambiente.	
Data corrente: 	04/09/2023	
Data da última atualização: 	04/09/2023	
Autoria: 	PAIXÃO, F. R. S. da; MUNIZ, E. R.; CATÃO, A. M. L.; SANTOS, T. R.; LUZ, C.; MARRETO, R. N.; MASCARIN, G. M.; FERNANDES, É. K. K.	
Afiliação: 	FLÁVIA REGINA SANTOS DA PAIXÃO, UNIVERSIDADE FEDERAL DE GOIÁS; ELEN REGOZINO MUNIZ, UNIVERSIDADE FEDERAL DE GOIÁS; ALAINE MARIA LOPES CATÃO, UNIVERSIDADE FEDERAL DE GOIÁS; THAINÁ RODRIGUES SANTOS, UNIVERSIDADE FEDERAL DE GOIÁS; CHRISTIAN LUZ, UNIVERSIDADE FEDERAL DE GOIÁS; RICARDO NEVES MARRETO, UNIVERSIDADE FEDERAL DE GOIÁS; GABRIEL MOURA MASCARIN, CNPMA; ÉVERTON KORT KAMP FERNANDES, UNIVERSIDADE FEDERAL DE GOIÁS.	
Título: 	Microsclerotial pellets of Metarhizium spp.: thermotolerance and bioefficacy against the cattle tick.	
Ano de publicação: 	2023	
Fonte/Imprenta: 	Applied Microbiology and Biotechnology, v. 107, n. 7-8, p. 2263-2275, 2023.	
ISSN: 	0175-7598	
DOI: 	https://doi.org/10.1007/s00253-023-12467-7	
Idioma: 	Inglês	
Conteúdo: 	Abstract: The cattle tick, Rhipicephalus microplus (Acari: Ixodidae), is a multi-billion dollar ectoparasite of global importance affecting beef and milk production. Submerged cultures of cosmopolitan entomopathogenic fungal species of the genus Metarhizium typically produce microsclerotia that provide both long-term survival and environmental resistance. Microsclerotia hold great potential as an unconventional active propagule to control this tick under laboratory and semi-field conditions. However, heat stress caused especially by elevated temperatures poses a critical environmental constraint for the successful development and efficacy of microsclerotia under tropical conditions. First, we screened six strains of Metarhizium anisopliae, Metarhizium robertsii and Metarhizium humberi for their ability to produce microsclerotia by submerged liquid cultivation. In addition, we assessed the biological fitness and bioefficacy of dried microsclerotial pellets under amenable (27 °C) and heat-stressed (32 °C) incubation against engorged adult females of R. microplus. Microsclerotia in pelletized formulation prepared with carriers based on diatomaceous earth and microcrystalline cellulose exhibited conidial production at different extents according to the fungal strain and the incubation temperature, but most strains displayed reduced sporogenesis when exposed to 32 °C. Engorged tick females exposed to sporulated microsclerotia from pelletized M. anisopliae CG47 or IP 119 had fewer number of hatching larvae in comparison to the control group, irrespective of the incubation temperature tested. The minimum dosage of microsclerotial pellets that effectively reduced hatchability of tick larvae was estimated to be 2 mg per plate (equivalent to 6.0 kg per hectare). Metarhizium microsclerotial pellets exhibited significant tolerance to 32 °C and pronounced acaricidal activity against this economically important ectoparasite of cattle, even under simulated environmental heat stress.	
Palavras-Chave: 	Ectoparasite; Fungal entomopathogen; Fungal propagule.	
Thesagro: 	Calor; Carrapato; Fungo Para Controle Biológico.	
Thesaurus Nal: 	Biological control agents; Entomopathogenic fungi; Heat stress; Metarhizium.	
Categoria do assunto: 	S Ciências Biológicas	
Registro original: 	Embrapa Meio Ambiente (CNPMA)	
Exemplares: 	CNPMA - (17448-1) - UPC - AP - DD -  -  -  - DIS