Data/hora: 21/09/2024 21:40:01

Biblioteca(s): 	Embrapa Gado de Leite.	
Data corrente: 	10/08/2021	
Data da última atualização: 	10/08/2021	
Autoria: 	MARCHESINI, P.; NOVATO, T. P.; CARDOSO, S. J.; PRATA, M. C. de A.; NASCIMENTO, R. M. do; KLAFKE, G.; COSTA-JÚNIOR, L. M.; MATURANO, R.; LOPES, W. D. Z.; BITTENCOURT, V. R. E. P.; MONTEIRO, C.	
Afiliação: 	PAULA MARCHESINI, Universidade Federal Rural do Rio de Janeiro; TATIANE PINHEIRO NOVATO, Universidade Federal Rural do Rio de Janeiro; SIMONE JAQUELINE CARDOSO, Universidade Federal de Juiz de Fora; MARCIA CRISTINA DE AZEVEDO PRATA, CNPGL; RAFAEL MOREIRA DO NASCIMENTO, Universidade Federal de Juiz de Fora; GUILHERME KLAFKE, Centro de Pesquisa em Saúde Animal, Eldorado do Sul, RS; LÍVIO M. COSTA-JÚNIOR, Universidade Federal do Maranhão; RALPH MATURANO, Universidade Federal de Juiz de Fora; WELBER DANIEL ZANETI LOPES, Universidade Federal de Goiás; VÂNIA RITA ELIAS PINHEIRO BITTENCOURT, Universidade Federal Rural do Rio de Janeiro; CAIO MONTEIRO, Universidade Federal de Goiás.	
Título: 	Acaricidal activity of (E)-cinnamaldehyde and alpha-bisabolol on populations of Rhipicephalus microplus (Acari: Ixodidae) with different resistance profiles.	
Ano de publicação: 	2020	
Fonte/Imprenta: 	Veterinary Parasitology, v. 286, 109226, 2020.	
DOI: 	https://doi.org/10.1016/j.vetpar.2020.109226	
Idioma: 	Inglês	
Conteúdo: 	This study aimed to investigate the acaricidal activity of (E)-cinnamaldehyde and &#945;-bisabolol on populations of Rhipicephalus microplus with different resistance profiles. The adult immersion test (AIT) was used to characterize the susceptibility of tick populations (50 field populations) to synthetic acaricides: deltamethrin, amitraz, and chlorfenvinphos. The larval packet test (LPT) was used to determine the LC50 values for (E)-cinnamaldehyde (populations 1?25) and &#945;-bisabolol (populations 26?50) at the concentrations of 0.31, 0.62, 1.25, 2.0, 2.5, 5.0 and 10.0 mg/mL. The susceptible strain Porto Alegre (POA) was used as a reference for calculating the resistance ratio (RR). In the AIT, deltamethrin did not show efficacy >95 % for any of the populations, whereas amitraz and chlorfenvinphos have presented efficacy >95 % for three (6 %) and 15 (30 %) populations, respectively. In the LPT, the LC50 values of (E)-cinnamaldehyde and &#945;-bisabolol varied from 0.23 to 2.36 mg/mL and 1.57?3.01 mg/mL, respectively. The RR50 for (E)-cinnamaldehyde showed 20 (80 %) populations with values <1.0 and no population with values>1.5. As for &#945;-bisabolol, only two (8%) populations have presented RR50 <1.0, whereas three (12 %) populations showed incipient resistance to this sesquiterpene (RR50 between 1.5 and 2.0). The results indicate that all studied tick populations showed low susceptibility to at least one of the commercial acaricides tested. In addition, comparison between the LC50 values of (E)-cinnamaldehyde and &#945;-bisabolol for the field populations and the susceptible strain POA suggests that there is no cross-resistance of (E)-cinnamaldehyde and &#945;-bisabolol for the tick populations evaluated, and that the differences in the LC50 values are due to population variations.	
Palavras-Chave: 	Fenilpropanóide; Resistência cruzada; Sesquiterpeno.	
Thesagro: 	Acaricida; Bovino; Carrapato.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
Registro original: 	Embrapa Gado de Leite (CNPGL)	
Exemplares: 	CNPGL - (25164-1) - UPC - AP - DD -  -  -  - DIS