Comparação da eficácia de formulação carrapaticida aplicada em diferentes sistemas de pulverização para controle de Rhipicephalus microplus
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2022-02-25
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Universidade Federal de Goiás
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The present work compared the efficiency of three different equipment for acaricides application to control Rhipicephalus microplus. Two comparative experiments were performed. To compare the equipment, an acaricide containing three active ingredients (one pyrethroid and two organophosphate) was used. In experiment 1, three devices were tested: backpack sprayer (BS), high pressure sprayer (HPS) and automated sprayer (AS). In experiment 2, two devices were tested: BS and HPS. In both experiments, 10 bovines with similar tick burden were used. In day 0, both experiments, the animals were treated with the acaricide. On days +1 (only experiment 1), +3, +7, +14, +21, +28 and +35 (only experiment 2), ticks count was performed to determine the efficiency of control. The application time, pressure (KPa) and volume applied (L) in each spraying system were also evaluated. Adult immersion test (AIT) using three different acaricides based on pyrethroid and organophosphate was performed to compare the susceptibility of strains from each farm. In experiment 1, all treatments reduced significantly (p < 0.05) the number of ticks on animals, however, the HPS showed better efficacy of the acaricide since day +1. In experiment 2, both treatments reduced (p < 0.05) the tick burden, however the HPS resulted in more accentuated reduction. The application period was of 4.5, 150 e 330 seconds, while pressure was of 306.8, 4,826.3 and 172.4 – 220.6 KPa for AS, HPS and BS, respectively. In the AIT the observed efficacies were between 99.8 - 100% for the strain of the farm of the experiment 1, while were between 67.2 - 80.9% for the strain from the farm of experiment 2. We conclude the application device influences the efficiency of the acaricide. All three sprayers were efficient for acaricide application; the best efficiency was obtained using the HPS while the AS showed a reliable efficiency with lower application period and the strain of the farm of the experiment 1 was more susceptible for all acaricides tested.
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MORAES JUNIOR, N. R. Comparação da eficácia de formulação carrapaticida aplicada em diferentes sistemas de pulverização para controle de Rhipicephalus microplus. 2022. 65 f. Dissertação (Mestrado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2022.