EFFECTS OF SPRAY FORMULATIONS ON RHIPICEPHALUS MICROPLUS’ REPRODUCTIVE PARAMETERS OF FEMALES FROM EXPERIMENTALLY INFESTED CATTLE
Autor(es): Gustavo Felippelli, Luciana Prando, Flavia Carolina Fávero, Willian Giquelin Maciel, Lucas Vinicius Costa Gomes, Weslen Fabrício Pires Texeira, Carolina Buzzulini, Breno Cayeiro Cruz, Gilson Pereira de Oliveira, Alvimar José da Costa
EFFECTS OF SPRAY FORMULATIONS ON RHIPICEPHALUS MICROPLUS’ REPRODUCTIVE PARAMETERS OF FEMALES FROM EXPERIMENTALLY INFESTED CATTLE
» Área de pesquisa: ACAROLOGIA
» Instituição: CPPAR - Animal Health Research Center - Faculdade de Ciências Agrárias e Veterinárias, UNESP, Via de acesso Prof. Paulo Donatto Castellane, s/nº, CEP: 14884-900, Jaboticabal, São Paulo – Brazil.
» Agência de fomento e patrocinadores:
The present study assessed the deleterious effects of cypermethrin 15% + chlorpyriphos 25% + citronellal 1%, cypermethrin 8% + ethion 60% and DDVP 60% + chlorpyriphos 20% on the reproductive parameters of engorged R. (B.) microplus females that naturally detached from experimentally infested cattle in three different experiments. In experiment I, the spray application of cypermethrin + chlorpyriphos + citronellal presented an acaricidal efficacy higher than 80% starting from day 3 to 9 post-treatment (p. t.), occurring again from days 16 to 30 and being above 90% on days 8, 9, 23, 25, 26 and 29. The treated group demonstrated a 63.23% reduction in oviposition, 10.53% reduction in hatchability and the reproductive efficacy was 64.74%. In experiment II, the association of cypermethrin and ethion presented acaricidal efficacy higher than 80% from day 5 until day 29. The efficacy was higher than 90% from days 7 to 28 p. t. The formulation percentage of reduction in oviposition of engorged female ticks was 73.18%. It presented a reduction of 35.79% in hatchability and the percentage of efficacy on the reproductive parameters of engorged female ticks achieved 70.08%. In experiment III, DDVP associated with chlorpyriphos reached acaricidal efficacy higher than 90% starting on day 2, which lasted until day 25, reaching 100% on day 6 p. t. The percentage of reduction in oviposition was 93.50%. It presented a reduction of 78.79% in hatchability and the efficacy on reproductive parameters of engorged female ticks achieved 96.45%. Comparing the data gathered from these experiments it is possible to observe that the association between DDVP and chlorpyriphos, two organophosphates, presented highest acaricidal efficacy and more deleterious effects on the reproductive parameters of engorged R. (B.) microplus females when compared to the associations between organophosphates and synthetic pyrethroids.
