Studies of the management of the tick Rhipicephalus (Boophilus) microplus in southern Rio Grande do Sul, Brazil

Pesquisa Veterinária Brasileira

Pappen, Felipe G.¹  Cunha Filho, Nilton A.²  Vaz Junior, Itabajara S.³  Farias, Nara Amélia R.²  Santos, Tânia Regina B.¹ 

[1] Universidade Federal de Pelotas, Pelotas, Brasil;Universidade Federal de Pelotas, Pelotas;UFRGS, Porto Alegre, Brasil

关键词: Rhipicephalus (Boophilus) microplus;    risk factors;    resistance;    acaricides;    South Brazil.;   

DOI  :  10.1590/S0100-736X2009000100010

来源: Colegio Brasileiro de Patologia Animal-CBPA

【 摘 要 】

In the southern region of Rio Grande do Sul, cattle become infested with Rhipicephalus (B.) microplus mainly between October and April due to the climatic conditions. In addition to knowing its life cycle, knowledge of parasite's epidemiology is essential to establish management strategies. Epidemiological studies on resistance to acaricides in Rio Grande do Sul as well as in the rest of Brazil are scarce. Moreover, the large geographical area and the structural deficiency with respect to the use and access to databases make reliable data difficult to obtain. The present study surveyed the perception by cattle breeders in the southern region of Rio Grande do Sul in regards of identification of R. (B.) microplus populations that are difficult to manage using acaricides, as well as the risk factors for the selection of resistant tick populations. Tick management data on beef cattle in 85 properties of seven municipalities were collected. The results revealed that the difficulty in tick management correlated positively with levels of education of the farm owners (up to elementary school, OR = 3.67 and p = 0.01) and with the yearly number of acaricide applications (over four, with OR = 4.05 and p= 0.006). These results also suggest that properties with more than 100 beef cattle under extensive farming conditions in the southern region of Rio Grande do Sul show characteristics that may contribute to longer acaricide lifetimes as compared to other regions in the Country. Index

【 授权许可】

CC BY-NC