Objetivo. Determinar la eficacia de una mezcla de Cipermetrina y Clorpirifós contra la mosca de los cuernos Haematobia irritans. Materiales y métodos. Se utilizaron 24 novillas Holstein con infestación natural de moscas Haematobia irritans y se asignaron aleatoriamente a dos grupos, tratado y control, de 12 animales cada uno. El grupo tratado recibió el producto por aspersión en dilución 1:800, utilizando 1 litro por cada 100 kilos de peso. Se hicieron conteos de moscas antes del tratamiento y en los días 7, 14 y 21 post-aplicación para evaluar la eficacia del producto. Resultados. Los porcentajes de eficacia del producto fueron de 89.9, 97.4 y 99.5%, para los días 7, 14 y 21 post-tratamiento, respectivamente. Conclusiones. La mezcla de Cipermetrina y Clorpirifós resultó altamente eficaz contra la mosca de los cuernos Haematobia irritans y surge como una nueva alternativa para el control del parásito, especialmente donde se presente resistencia a las diferentes moléculas que contienen los productos comerciales.
Objective. To determine the effect of a mixture of Cypermethrin and Chlorpiriphos on the control of the Haematobia irritans fly (horn fly). Materials and methods. A total of 24 Holstein heifers, naturally infested with Haematobia irritans flies, were randomly allocated into two Groups (n=12): 1) Group Control and 2) Group Treated. The control group was not sprayed with any product and the treated group was sprayed with the product diluted (1:800), using 1 liter per 100 kilos of body weight. to evaluate the effect of the product. Flies were counts in each animal before treatment (day 0) and on days 7, 14 and 21 post application of the product. Total number of flies (%) were compared between groups and between days. Results. Efficacy of the product were 89.9, 97.4 and 99.5%, for days 7, 14 and 21 post-treatment, respectively. Conclusions. The mixture of Cypermethrin and Chlorpiriphos was highly effective against the horn fly and stands up as a new alternative for the control of the parasite, especially where resistance to different molecules of commercial products have occurred.
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