Horn fly (Haematobia irritans) resistance to cypermethrin and diazinon in the state of Tamaulipas, Mexico: current situation

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ZEFERINO GARCÍA VÁZQUEZ
CONSUELO ALMAZÁN GARCÍA
ANTONIO CANTÚ COVARRUBIAS
ALFREDO VEGA FLORES
SINDEY KUNZ
ANTONIO MEDELLÍN LEDEZMA

Abstract

THE AIM OF THIS STUDY WAS TO DETERMINE RESISTANCE TO THE PESTICIDES CYPERMETHRIN (PYRETHROID) AND DIAZINON (PHOSPHATE) IN THE HORN FL Y (HAEMATOBIA IRRITANS) IN THE STATE OF TAMAULIPAS, MEXICO. A TOTAL OF 36 FARMS WERE EVALUATED: 11 IN THE NORTH, 14 IN THE CENTRAL AND 11 IN THE SOUTHERN PART OF THE STATE. FOR THE CYPERMETHRIN DIAGNOSIS, IMPREGNATED FILTER PAPERS WITH LD50 AND LD99 WERE USED, AS WELL AS GLASS VIALS IMPREGNATED WITH DIAZINON WITH LD50 AND LD99. HORN FL IES WERE COLLECTED FROM EACH FARM, AND EXPOSED TO 2.5, 6 AND 0 œG/CM2 OF CYPERMETHRIN, AND 0.01, 0.06 AND 0 œG/CM2 OF DIAZINON. THREE REPETITIONS FOR EACH CONCENTRATION WERE CARRIED OUT. MORTALITY PERCENTAGE WAS OBTAINED AFTER TWO HOURS OF EXPOSURE TO THE INSECTICIDES. ALL RANCHES WERE RESISTANT TO CYPERMETHRIN IN THE NORTHERN PART, WHILE ONLY TWO OF THEM WERE RESISTANT TO DIAZINON. ALL RANCHES IN THE CENTRAL PART, EXCEPT FOR ONE, SHOWED RESISTANCE TO CYPERMETHRIN, WHILE IN MOST OF THE FARMS THE HORN FLIES WERE SUSCEPTIBLE TO DIAZINON. RESISTANCE TO CYPERMETHRIN WAS FOUND IN ALL RANCHES IN THE SOUTHERN PART; HOWEVER, EIGHT OF THEM (72%) WERE ALSO RESISTANT TO DIAZINON. THEREFORE, WE SUGGEST THAT ENHANCED TOXICITY OF DIAZINON (OR NEGATIVE CROSS-RESISTANCE), AS OBSERVED IN PYRETHROID-RESISTANT HORN FL Y FIELD POPULATION, COULD BE USED AS A RESISTANCE MANAGEMENT PRACTICE IN THE STATE OF TAMAULIPAS.
Keywords:
RESISTANCE HORN FLY HAEMATOBIA IRRITANS CYPERMETHRIN DIAZINON

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