Efficacy profile of Cypermethrin and Chlorpyrifos based acaricides on Rhipicephalus microplus control on cattle in the rearing phase, naturally infested and exposed to tick fever agents in central Brazil.
RODRIGUESA, V. DA S. | BONATE JUNIOR, P. | GARCIA, M. V. | HIGA, L. DE O. S. | PIÑA, F. T. B. | ZIMMERMANND, N. P. | DUARTE, P. O. | BARROS, J. C. | ANDREOTTI, R. | Vinicius da Silva Rodrigues, Pós-Graduação em Doenças Infecciosas e Parasitárias/Faculdade de Medicina/Universidade Federal Mato Grosso do Sul - UFMS; Paulino Bonatte Jr, Pós-Graduação em Ciência Animal/Faculdade de Medicina Veterinária/Universidade Federal Mato Grosso do Sul - Pós-Graduação em Ciência Animal, Faculdade de Medicina Veterinária/Universidade Federal Mato Grosso do Sul - UFMS; Marcos Valério Garcia, Laboratório de Biologia do Carrapato/Embrapa Gado de Corte; Leandro de Oliveira Souza Higa, Pós-Graduação em Doenças Infecciosas e Parasitárias/Faculdade de Medicina/Universidade Federal Mato Grosso do Sul - UFMS; Francisco Tobias Barradas Piña, Pós-Graduação em Doenças Infecciosas e Parasitárias/Faculdade de Medicina/Universidade Federal Mato Grosso do Sul - UFMS; Namor Pinheiro Zimmermannd, Centro Universitário da Grande Dourados; Pâmella Oliveira Duarte, Pós-Graduação em Doenças Infecciosas e Parasitárias/Faculdade de Medicina/Universidade Federal Mato Grosso do Sul - UFMS; JACQUELINE CAVALCANTE BARROS, CNPGC; RENATO ANDREOTTI E SILVA, CNPGC.
The objective of this work was to evaluate the efficacy of two cypermethrin- and chlorpyrifos-based acaricides in controlling Rhipicephalus microplus in a naturally infested bovine herd and in in vitro tests, as well as to monitor the animals for tick fever. Male bovines in the rearing phase were used, with 30 Brangus and 30 Nellore animals naturally infested. The groups were composed as follows: 15 Nellore treated, 15 Nellore control, 15 Brangus treated and 15 Brangus control. Every 18 days, the animals were monitored for tick count, acaricide treatment, weight, blood pack cell volume, and clinical signs. For in vitro tests, the larval packet test, adult immersion test and DNA amplification for tick fever diagnosis were performed. In the first animal treatment period, product 1 (cypermethrin, 15 g+chlorpyrifos, 25 g+citronellal, 1 g) was used; in the second period, product 2 (cypermethrin, 15 g+chlorpyrifos, 30 g+fenthion, 15 g) was used. In Brangus animals, the mean efficacy was 35.1% and 95.8% in the first and second periods, respectively, for the same animals. For Nellore animals, the efficacy in periods one and two was 51% and 97.1%, respectively. The in vitro results showed efficacy above 95% for the two challenged acaricides. The Brangus animals showed a high production of ticks associated with the presence of tick fever agents, which could generate risks for the disease's enzootic stability.
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