Sunday, 18 September 2016

2010 Repellent activity of plant-derived compounds against Amblyomma cajennense (Acari: Ixodidae) nymphs

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.


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.