Vet Parasitol. 2010 Jan 20;167(1):67-73. doi: 10.1016/j.vetpar.2009.09.047. Epub 2009 Oct 7.
Repellent activity of plant-derived compounds against Amblyomma cajennense (Acari: Ixodidae) nymphs.
1Centro de Parasitologia Veterinária, Escola de Veterinária,
Universidade Federal de Goiás (UFG), Campus II Samambaia, Caixa Postal
131, 74001-970 Goiânia, GO, Brazil. sfsoares@gmail.com
Abstract
Repellence
responses of Amblyomma cajennense nymphs to callicarpenal, intermedeol,
Hyptis suaveolens essential oil, extract of Melia azedarach, Cymbopogon
nardus, Spiranthera odoratissima, Chenopodium
ambrosioides, Ageratum conyzoides, Mentha pulegium, Ruta graveolens,
and Memora nodosa were studied. Among these the extract of C. nardus
stood out because of the long-lasting repellence, maintaining, in the
highest concentration, 35h of protection against 90% of the nymphs. The
essential oil of H. suaveolens and the extracts of C. ambrosioides and
A. conyzoides showed good repellence index (66%) when applied in high
concentrations. However, greater protection could be obtained at higher
concentrations but with a shorter repellence time. Callicarpenal,
intermedeol, extract of M. Pulegium, and M. nodosa leaves showed
moderate repellence in high concentrations. Extracts from M. azedarach,
R. graveolens, S. odoratissima, and M. nodosa roots showed little or no
repellent effect. These results show that some plant extracts may
represent a promising alternative in the control of infestations by A.
cajennense.
Copyright 2009 Elsevier B.V. All rights reserved.
