Adult repellency and larvicidal activity of five plant essential oils against mosquitoes

J Am Mosq Control Assoc. 2006 Sep;22(3):515-22. doi: 10.2987/8756-971X(2006)22[515:ARALAO]2.0.CO;2.


The larvicidal activity and repellency of 5 plant essential oils--thyme oil, catnip oil, amyris oil, eucalyptus oil, and cinnamon oil--were tested against 3 mosquito species: Aedes albopictus, Ae. aegypti, and Culex pipiens pallens. Larvicidal activity of these essentials oils was evaluated in the laboratory against 4th instars of each of the 3 mosquito species, and amyris oil demonstrated the greatest inhibitory effect with LC50 values in 24 h of 58 microg/ml (LC90 = 72 microg/ml) for Ae. aegypti, 78 microg/ml (LC90 = 130 microg/ml) for Ae. albopictus, and 77 microg/ml (LC90 = 123 microg/ml) for Cx. p. pallens. The topical repellency of these selected essential oils and deet against laboratory-reared female blood-starved Ae. albopictus was examined. Catnip oil seemed to be the most effective and provided 6-h protection at both concentrations tested (23 and 468 microg/ cm2). Thyme oil had the highest effectiveness in repelling this species, but the repellency duration was only 2 h. The applications using these natural product essential oils in mosquito control are discussed.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aedes
  • Animals
  • Cinnamomum zeylanicum
  • Culex
  • Culicidae*
  • Eucalyptus
  • Female
  • Humans
  • Insect Repellents*
  • Insecticides*
  • Larva
  • Nepeta
  • Plant Oils*
  • Thymus Plant


  • Insect Repellents
  • Insecticides
  • Plant Oils