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2004, Number 3

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Vet Mex 2004; 35 (3)

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

Almazán GC, Cantú CA, Vega FA, García VZ, Kunz S, Medellín LA

Language: English/Spanish
References: 21
Page: 237-244
PDF size: 419.19 Kb.


ABSTRACT

The aim of this study was to determine resistance to the pesticides cypermethrin (pyrethroid) and diazi-non (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 fi lter 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 µg/cm2 of cypermethrin, and 0.01, 0.06 and 0 µg/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 cyperme-thrin, while in most of the farms the horn fl ies 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 diazi-non. Therefore, we suggest that enhanced toxicity of diazinon (or negative cross-resistance), as observed in pyrethroid-resistant horn fl y fi eld population, could be used as a resistance management practice in the state of Tamaulipas.


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