Ferreira Aline Kelly Araújo Costa Velame, E Silva Neto Wagner Carvalho, de Castro Oliveira Igor, Rodrigues Maria Clara Bastos, de Oliveira Lima Ângela Cristina, Ferreira Tiago Velame, de Matos Carolina Carneiro, da Silva Cavalcante Ana Karina, de Carvalho Lorendane Millena, de Souza Perinotto Wendell Marcelo
Curso de Pós-Graduação Em Ciência Animal Nos Trópicos, Universidade Federal da Bahia, Av. Milton Santos, S/nº - Ondina, Salvador, BA, CEP: 40170 - 110, Brazil.
Centro de Ciências Agrárias, Ambientais E Biológicas, Universidade Federal Do Recôncavo da Bahia, Rua Rui Barbosa, 710, Cruz das Almas, Bahia, CEP: 44380 - 000, Brazil.
Trop Anim Health Prod. 2025 May 5;57(4):207. doi: 10.1007/s11250-025-04444-1.
This study aimed to evaluate the efficacy of a commercial formulation containing the combination of chlorfenvinphos and dichlorvos on Rhipicephalus microplus in a field test in northeastern Brazil. Adult crossbred cattle naturally infested with R. microplus were restrained in a trunk to count partially engorged female ticks between 4.5 and 8.0 mm in length on days -7, -3, and -1 before the acaricide was applied. The animals were divided into two groups containing ten animals each and with similar tick infestations (P > 0.05). In the control group, the animals were sprayed with drinking water. In contrast, in the treated group, the animals were sprayed with the acaricide formulation containing chlorfenvinphos and dichlorvos diluted following the manufacturer's instructions using 1 L of water/product for every 100 kg of the animal. To assess treatment efficacy, partially engorged female tick counts were carried out, by individually inspecting each animal on the left side of the body every seven days for 28 days. The results showed that the combination of chlorfenvinphos and dichlorvos was highly effective, especially on days + 7 and + 14, with tick reductions of 96.6% and 95.9%, with an overall average decrease in ticks of the four counts of 92.4%. Formulation containing chlorfenvinphos and dichlorvos was effective in the field test on the population of R. microplus in cattle in the northeast of Brazil. These results are significant because they enable producers to use a formulation considered to be low-cost and have a short waiting period of action, which will contribute to the control of cattle ticks.
本研究旨在评估一种含有毒虫畏和敌敌畏组合的商业制剂在巴西东北部进行的田间试验中对微小扇头蜱的疗效。自然感染微小扇头蜱的成年杂交牛被限制在一个树干内，以便在施用杀螨剂前的第-7天、-3天和-1天对体长在4.5至8.0毫米之间的部分饱血雌蜱进行计数。将动物分为两组，每组十只，蜱虫感染情况相似（P>0.05）。对照组动物用饮用水喷洒。相比之下，在治疗组中，按照制造商的说明，使用每100千克动物1升水/产品的比例稀释含有毒虫畏和敌敌畏的杀螨剂制剂对动物进行喷洒。为了评估治疗效果，在28天内每七天对每只动物身体左侧进行单独检查，对部分饱血雌蜱进行计数。结果表明，毒虫畏和敌敌畏的组合非常有效，尤其是在第+7天和+14天，蜱虫减少率分别为96.6%和95.9%，四次计数的蜱虫总体平均减少率为92.4%。含有毒虫畏和敌敌畏的制剂在巴西东北部牛群中的微小扇头蜱种群田间试验中有效。这些结果意义重大，因为它们使生产者能够使用一种被认为成本低廉且作用等待期短的制剂，这将有助于控制牛蜱。
