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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Resistance to cypermethrin, deltamethrin and chlorpyriphos in populations of Rhipicephalus (Boophilus) microplus (Acari: Ixodidae) from small farms of the State of Sao Paulo, Brazil

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Author(s):
Mendes, M. C. [1] ; Lima, C. K. P. [1] ; Nogueira, A. H. C. [1] ; Yoshihara, E. [2] ; Chiebao, D. P. [3] ; Gabriel, F. H. L. [3] ; Ueno, T. E. H. [4] ; Namindome, A. [5] ; Klafke, G. M. [5]
Total Authors: 9
Affiliation:
[1] Ctr Pesquisa & Desenvolvimento Sanidade Anim, Inst Biol, BR-0414002 Sao Paulo - Brazil
[2] Agencia Paulista Tecnol Agronegocios, BR-19015970 Presidente Prudente, SP - Brazil
[3] Agencia Paulista Tecnol Agronegocios, Polo Reg Ctr Insumos, BR-18013440 Sorocaba, SP - Brazil
[4] Agencia Paulista Tecnol Agronegocios, Polo Reg Ctr Norte, BR-15830000 Pindorama, SP - Brazil
[5] Univ Sao Paulo, Inst Ciencias Biomed, Dept Parasitol, BR-05508900 Sao Paulo - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Veterinary Parasitology; v. 178, n. 3-4, p. 383-388, JUN 10 2011.
Web of Science Citations: 47
Abstract

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. (AU)