期刊
VETERINARY PARASITOLOGY
卷 178, 期 3-4, 页码 383-388出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.vetpar.2011.01.006
关键词
Rhipicephalus (Boophilus) microplus; Acaricide resistance; Synthetic pyrethroids; Organophosphates; Larval packet test
资金
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo [2006/55934-4]
A field survey of resistance was conducted based on the larval packet test technique with synthetic pyrethroids (cypermethrin and deltamethrin) and organophosphates (chlorpyriphos) in Rhipicephalus (Boophilus) microplus field populations from six different regions of the State of Sao Paulo (Brazil). 82.6% of the populations showed resistance to cypermethrin, 86.36% to deltamethrin and 65.25% to chlorpyriphos, with 50% presenting resistance to both SP and OP acaricide. According to the questionnaires completed by the producers, OP + SP mixtures followed by SP-only formulations were the products most commonly used for controlling the cattle tick in the surveyed areas. The present study showed high occurrence of resistance to SP and OP in the State of Sao Paulo, Brazil and revealed the type of strategy adopted by small dairy farms in this state. This information is fundamental in order to establish the monitoring of resistance on each farm individually, contributing to the rational use of acaricides for the control of R. (B.) microplus. (C) 2011 Elsevier B.V. All rights reserved.
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