TESTES IN VITRO DE RESISTÊNCIA CARRAPATICIDA EM LAVRAS DE RHIPICEPHALUS(Boophilus) MICROPLUS PROVENIENTES DA REGIÃO DO BREJO PARAÍBANO

Abstract

Among the important ectoparasites for domestic livestock, the Rhipicephalus (Boophilus) microplus assumes great importance, because of the direct losses, with consequent loss in production of meat and / or milk and indirect for disease transmission beyond the drug costs for its control. This study evaluated the sensitivity of strains of Rhipicephalus (Boophilus) microplus to the following active ingredients: amitraz, chlorpyrifos, fipronil, cypermethrin, ivermectin through the test packet of samples of larvae in the cities of Areia-PB and Bananeiras- PB total of four properties from November to December 2014 very high resistance factor levels were found in the properties studied: Cypermethrin (100%), Amitraz (75%), Ivermectin, (50%) and Chlorpyrifos (50%). The only drug that got irrelevant values in 75% of the properties was Fipronil, which is little used will field due to the high cost, can justify such data. Chemical control, based on SAE remain as the main weapon for its effective combat, making it essential to earlier diagnosis of the resistance, and hence the choice of the most effective active ingredients in your control, simply and cost.