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1 January 2010 Limited Efficacy of Commercially Formulated Essential Oils on Vegetation against Female Aedes albopictus and Culex quinquefasciatus
J. E. Cilek, C. F. Hallmon, R. Johnson
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To address inquiries from the general public and Florida mosquito control programs on the effectiveness of natural products to control resting adult mosquitoes on vegetation, we conducted a study that evaluated the toxicity of several commercially available products containing plant essential oils against female Aedes albopictus (Skuse) and Culex quinquefasciatus Say (Diptera: Culicidae) when applied to the leaves of a common Florida landscape shrub, the southern wax myrtle, Myrica cerifera L. (Myricaceae). The products tested were EcoExempt MC©, Misting System Concentrate©, Mosquito Barrier©, No-See-Um Organic Repellent©, and Orange Guard©. All products were applied at maximum label rates via a hand pump sprayer and compared with a commercial formulation of synergized pyrethrins, Riptide©, as a standard. Excised leaf bioassays revealed that the essential oil formulations provided less than 10% mortality to both mosquito species with essentially no residual activity beyond 24 h. Riptide provided significantly greater mortality, approximately 25% and 41%, at 24 h for Ae. albopictus and Cx. quinquefasciatus, respectively, but this product did not exhibit residual activity beyond 24 h on treated leaves. We conclude that vegetative surfaces treated with the above products containing essential oils would not prove sufficiently effective to control mosquitoes when compared with conventional pyrethroid insecticides labeled for the same purpose.

J. E. Cilek, C. F. Hallmon, and R. Johnson "Limited Efficacy of Commercially Formulated Essential Oils on Vegetation against Female Aedes albopictus and Culex quinquefasciatus," Journal of Agricultural and Urban Entomology 27(1), 54-60, (1 January 2010).
Accepted: 24 October 2011; Published: 1 January 2010

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botanical insecticides
essential oil
mosquito control
Myrica cerifera
southern wax myrtle
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