Chemical composition and larvicidal properties of the essential oils from Drimys brasiliensis Miers (Winteraceae) on the cattle tick Rhipicephalus (Boophilus) microplus and the brown dog tick Rhipicephalus sanguineus.
The essential oil obtained from leaves and stem barks of the Southern Brazilian native Drimys brasiliensis Miers, a tree with medicinal properties, was analyzed by gas chromatography (GC) and GC/mass spectrometry (MS). The oil was characterized by sesquiterpenoids (66%), cyclocolorenone being the most abundant (30.4%), followed by bicyclogermacrene (11.8%) and alpha-gurjunene (6.0%). Laboratory tests were carried out to determine the toxicity of the essential oil on larvae of the cattle tick Rhipicephalus (Boophilus) microplus and the brown dog tick Rhipicephalus sanguineus by the larval immersion test. It was observed that the oil was lethal, killing 100% of the larvae of both ticks at the doses of 25, 12.5, and 6.25 microl/ml. The lowest dose tested, 3.125 microl/ml, was also toxic, killing 95-98% of the larvae.
Laboratório de Acarologia e Entomologia, Faculdade de Veterinária, UFRGS, Av. Bento Gonçalves 9090, 91540-000 Porto Alegre, RS, Brazil.
Vera Lúcia Sardá
VL
Ribeiro
Verônica
V
Rolim
Sérgio
S
Bordignon
Amélia T
AT
Henriques
Gilséia G
GG
Dorneles
Renata P
RP
Limberger
Gilsane
G
von Poser
D000818:Animals; D002417:Cattle / Q000469:parasitology; D002418:Cattle Diseases / Q000469:parasitology; D004283:Dog Diseases / Q000469:parasitology; D004285:Dogs / Q000469:parasitology; D032424:Drimys; D007306:Insecticides / Q000494:pharmacology*; D009822:Oils, Volatile / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D010938:Plant Oils / Q000302:isolation & purification / Q000494:pharmacology*; D048494:Rhipicephalus / Q000187:drug effects*
D007306:Insecticides; D009822:Oils, Volatile; D010938:Plant Oils