Pyrethroid and organophosphate pesticide resistance in field populations of horn fly in Brazil

Pyrethroid and organophosphate pesticide resistance in field populations of horn fly in Brazil

Pesticides are used worldwide to control arthropod parasites in cattle herds. The indiscriminate and/or inappropriate use of pesticides without veterinary guidance is a reality in several countries of South America. Improper pesticide use increases the chances of contamination of food and the enviro...

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Bibliographic Details
Published in:Medical and veterinary entomology Vol. 33; no. 1; pp. 121 - 130
Main Authors: Brito, L. G., Barbieri, F. S., Rocha, R. B., Santos, A. P. L., Silva, R. R., Ribeiro, E. S., Guerrero, F., Foil, L., Oliveira, M. C. S.
Format: Journal Article
Language:English
Published: Oxford, UK Blackwell Publishing Ltd 01-03-2019
Wiley Subscription Services, Inc
Subjects:
acetylcholinesterase mutation
Animals
Bovidae
Brazil
Food contamination
Haematobia irritans
Insecticide Resistance - genetics
Insecticides - pharmacology
Livestock
Metabolites
Muscidae - drug effects
Muscidae - genetics
Mutation
Organophosphates
Organophosphates - pharmacology
Parasites
Pesticide resistance
Pesticides
Point mutation
Population studies
Pyrethrins - pharmacology
resistance mechanism
sodium channel
Sodium channels
Brazil
acetylcholinesterase mutation
resistance mechanism
sodium channel
Haematobia irritans
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Summary:Pesticides are used worldwide to control arthropod parasites in cattle herds. The indiscriminate and/or inappropriate use of pesticides without veterinary guidance is a reality in several countries of South America. Improper pesticide use increases the chances of contamination of food and the environment with chemical pesticides and their metabolites. Reduction of these contamination events is an increasing challenge for those involved in livestock production. The horn fly, Haematobia irritans (Linnaeus) (Diptera: Muscidae), is one of the most economically important parasites affecting cattle herds around the world. As such, horn fly control efforts are often required to promote the best productive performance of herds. Pesticide susceptibility bioassays revealed that pyrethroid resistance was widespread and reached high levels in horn fly populations in the Brazilian state of Rondônia. The knockdown resistance (kdr) sodium channel gene mutation was detected in all horn fly populations studied (n = 48), and the super kdr sodium channel gene mutation was found in all homozygous resistant kdr individuals (n = 204). Organophosphate resistance was not identified in any of the fly populations evaluated. The horn fly is one of the most economically important parasites affecting cattle herds around the world. Pesticide control in horn fly populations promotes excellent initial results, but the excessive use of these compounds results in insecticide resistance issues. The selection pressure imposed by pesticides means that as pesticide effectiveness increases, so do the selection for and rapidity of resistance development in horn fly populations.
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ISSN:0269-283X
1365-2915
DOI:10.1111/mve.12330