Repellent activity of plant-derived compounds against Amblyomma cajennense (Acari: Ixodidae) nymphs.
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.
Soares
Sara Fernandes
SF
Centro 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
Borges
Lígia Miranda Ferreira
LM
de Sousa Braga
Raquel
R
Ferreira
Lorena Lopes
LL
Louly
Carla Cristina Braz
CC
Tresvenzol
Leonice Manrique Faustino
LM
de Paula
José Realino
JR
Ferri
Pedro Henrique
PH
D000818:Animals; D001681:Biological Assay; D016009:Chi-Square Distribution; D031743:Cymbopogon / Q000737:chemistry*; D005260:Female; D006734:Horse Diseases / Q000469:parasitology* / Q000517:prevention & control; D006736:Horses; D006801:Humans; D026863:Ixodidae / Q000254:growth & development*; D010936:Plant Extracts / Q000494:pharmacology*; D013984:Tick Infestations / Q000469:parasitology / Q000517:prevention & control / Q000662:veterinary*
D010936:Plant Extracts