Obtention of a Rhipicephalus (Boophilus) microplus (ACARI:IXODIDAE) ivermectin-resistant strain. / Obtenção de uma cepa de Rhipicephalus (Boophilus) microplus (ACARI:IXODIDAE) resistente à ivermectina

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The establishment of drug resistant Rhipicephalus (B.) microplus isolates is a fundamental step on researches about drugs mechanisms of action and on the development of new acaricides. Different selection treatments were effectuated upon a field population with an ivermectin (IVM) resistant ratio (RR) 1,37 aiming to obtain experimentally a resistant strain. The larval treatments with IVM do not reach calf infestations. The adult treatments, in two consecutive generations do not changed the population RR. To this last protocol was added the IVM host treatment, increasing significantly the RR. Infestations using larvae obtained from the high-eclodibility oviposition seemed to have contributed much more to the RR increase observed on the last generation. Finally, it was possible to establish for the first time, on laboratory, an IVM resistant strain that showed a significantly higher RR value from the last generation (F10) in relation to the first one analyzed (F1).

ASSUNTO(S)

acaricida carrapato acaricida ivermectina ivermectina seleção tick seleção resistência resistência rhipicephalus (boophilus) microplus rhipicephalus (boophilus) microplus

ACESSO AO ARTIGO

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