Resistência de Rhipicephalus (Boophilus) microplus (Canestrini, 1888) aos acaricidas utilizados em gado leiteiro de Teixeirópolis, Rondônia, Brazil

Paulo Henrique Gilio Gasparotto,Jerônimo Vieira Dantas Filho,Carlos Alexandre Fernandes Dos Santos,Rauane Cristine Santos Ferraz,Cíntia Daudt,Flavio Roberto Chaves Da Silva

doi:10.21708/avb.2020.14.2.9123

Paulo Henrique Gilio Gasparotto, Jerônimo Vieira Dantas Filho + Show 4 more

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https://doi.org/10.21708/avb.2020.14.2.9123

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Abstract

Rhipicephalus microplus is one of the main ectoparasites of dairy cattle in Brazil, whose control is mainly based on the use of chemicals. However, the low variety of chemicals available, coupled with the indiscriminate use of these substances, has led to increased resistance for this tick. The objective of this study was to evaluate the resistance profile of the tick Rhipicephalus microplus to different acaricidal products used on dairy cows in Teixeiropolis-RO, using the Adult Immersion Test (TIA) or biocarrapaticidogram. Data was collected from nine farms by performing nine in vitro evaluation tests on engorged R. microplus females, using six different tick repelling treatments available on the market. Replicates of each treatment with 20 teleogins were performed for each treatment and a control group in distilled water was used for positive and negative controls. The efficiency amplitudes of each group and the average effectiveness of the acaricidal compounds were evaluated and compared by the Kruskal-Wallis test with a significance level of 95%. Statistical analyses were performed in the Action Stat statistical program. The tick repellents tested presented the following effectiveness averages: 100% (Chlorpyrifos at 50% + Cypermethrin at 6%); 99.99% (15% Cypermethrin + Chlorpyrifos at 25% + Citronellal at 1%); 77.63% (Cypermethrin at 20% + Chlorpyrifos at 50%); 100% (15% Cypermethrin + Chlorpyrifos at 25% + Piperonyl butoxide at 1%) -; 21.68% (Amitraz to 12.5%) -; 42.17% (Deltamethrin at 5%). Products with combinations of active ingredients were the most effective, and thus considered the best alternative for tick control.

Highlights

Brazil is one of the leading producers of milk in the world, with a herd of 17 million dairy cows in 2017 and a production of more than 30 million tons of milk per year (IBGE, 2017)
According to an estimate by the Food and Agriculture Organization of the United Nations, approximately 150 million farms are involved in milk production worldwide
Cypermethrin 20% + Chlorpyrifos 50%, The results in Table 1 show that 33.33% of the farms presented resistance to 50% of the formulations tested, indicating a problem for milk producers

Summary

Introduction

Brazil is one of the leading producers of milk in the world, with a herd of 17 million dairy cows in 2017 and a production of more than 30 million tons of milk per year (IBGE, 2017). According to an estimate by the Food and Agriculture Organization of the United Nations, approximately 150 million farms are involved in milk production worldwide. This activity is characteristic of developing countries and family farming, due to the rapid return that milk production provides to rural families (FAO, 2016). Among the milk producing countries, Brazil ranks 3rd in the world, after the United States and India (FAO, 2019)

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