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

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 São Paulo (Brazil)...

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Bibliographic Details
Published in:Veterinary parasitology 2011-06, Vol.178 (3), p.383-388
Main Authors: Mendes, M.C., Lima, C.K.P., Nogueira, A.H.C., Yoshihara, E., Chiebao, D.P., Gabriel, F.H.L., Ueno, T.E.H., Namindome, A., Klafke, G.M.
Format: Article
Language:English
Subjects:
Acari
Acaricide resistance
Animals
Boophilus
Boophilus microplus
Cattle
Cattle Diseases - parasitology
Cattle Diseases - prevention & control
Chlorpyrifos
cypermethrin
deltamethrin
Female
Insecticide Resistance
Insecticides
Ixodidae
Larval packet test
Male
monitoring
Nitriles
Organophosphates
Pyrethrins
questionnaires
Rhipicephalus
Rhipicephalus ( Boophilus) microplus
Rhipicephalus - growth & development
small farms
surveys
Surveys and Questionnaires
Synthetic pyrethroids
tick control
Tick Infestations - prevention & control
Tick Infestations - veterinary
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Summary: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 São 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 São 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.
ISSN:0304-4017
1873-2550
DOI:10.1016/j.vetpar.2011.01.006