Effect of a spray formulation on the reproductive parameters of a susceptible population of Rhipicephalus (Boophilus) microplus
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Data
2014-12
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Resumo
The number of studies emphasizing the possible damage that acaricidal spray formulations can cause on engorged
female ticks’ reproductive parameters is small. The present study evaluated the deleterious effects of a spray formulation
(dichlorvos 60% + chlorpyrifos 20%) on the reproductive parameters of a susceptible population of Rhipicephalus
(B.) microplus females, using the Stall Test. The ticks were allocated randomly to treatments according to the mean
numbers of females detached from each cow on days -3, -2 and -1 and the cattle pen location. The numbers of
engorged female ticks that naturally detached from the cattle were counted daily from day 1 to day 30. For each
group, 20 detached engorged female ticks or the available number collected daily were evaluated regarding reproductive
parameters. Associations of organophosphates demonstrated elevated acaricidal efficacy, as well as deleterious effects
on the reproductive parameters of R. (B.) microplus females. The engorged female weight (days 1 to 7), weight of
egg masses (days 5 to 10) and larval hatching percentage (days 5 to 19) were decreased (P ≤ 0.05). It is possible that
a formulation can lead to deleterious effects on R. (B.) microplus females when the tick population analyzed shows
elevated sensitivity towards a particular formulation. However, further studies need to be conducted.
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Carrapato bovino, Dichlorvos 60% + chlorpyrifos 20%, População susceptível, Eficiência reprodutiva, R. (B.) microplus, Cattle tick, Susceptible population, Reproductive efficiency
Citação
CRUZ, Breno Cayeiro; LOPES, Welber Daniel Zanetti; MACIEL, Willian Giquelin; FELIPELLI, Gustavo; TEIXEIRA, Weslen Fabricio Pires; FAVERO, Flavia Carolina; PRANDO, Luciana; BUZZULINI, Carolina; SOARES, Vando Edesio; GOMES, Lucas Vinicius Costa; BICHUETTE, Murilo Abud; COSTA, Alvimar José da. Effect of a spray formulation on the reproductive parameters of a susceptible population of Rhipicephalus (Boophilus) microplus. Revista Brasileira de Parasitologia Veterinária, Jaboticabal, v. 23, n. 4, p. 421-427, Oct./Dec. 2014.