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Medical, Urban, and Veterinary Entomology

10-Minute Paper

MUVE: Veterinary and Forensic Entomology On-Demand Presentations

Toxicity of a CO2- derived cedarwood oil on hard tick species (Ixodidae)

On-Demand
On-Demand
The Acaricidal activity of a CO2-derived cedarwood oil was evaluated against unfed nymphs of hard ticks, Amblyomma americanum (L)., Dermacentor variabilis (Say), Ixodes scapularis (Say) and Rhipicephalus sanguineus (Latrielle). Laboratory bioassays were conducted to determine the 50% lethal concentration (LC50) and 90% lethal concentration (LC90) of the CO2-derived cedarwood oil 24- and 48-hours post exposure of nymphs in treated vials. After 24 hours exposure, the LC50 values were 1.25, 3.45 and 1.42 µg cm-2 and LC90 values were 2.39, 7.59, and 4.14 µg cm-2 for D. variabilis, I. scapularis and R. sanguineus, respectively, but had minimal effect on A. americanum. After 48 hours exposure, the LC50 values were 4.14, 0.78, 0.79 and 0.52 µg cm-2, and LC90 values of 8.06, 1.48, 1.54 and1.22 µg cm-2 for A. americanum, D. variabilis, I. scapularis and R. sanguineus, respectively. The repellency of CWO on tick species decreased with time. The repellency and toxicity bioassays demonstrated concentration dependent responses of tick nymphs to the oil, indicating the potential of the CO2-derived cedarwood oil be developed as an eco-friendly repellent and/or acaricide.