The effectiveness of several commercially available products containing plant essential oils against caged female Aedes albopictus and Culex quinquefasciatus was studied. Products operationally applied via an automatic-timed insecticide application system (MistAway®) at maximum label rates were EcoExempt MC® (9.0 ml/liter, rosemary oil [18% AI], cinnamon oil [2% AI], lemongrass oil [2% AI], plus 78% “other ingredients” in wintergreen oil). Misting System Concentrate® (4 ml/liter, oil of Juniperus virginiana [85% AI]), Mosquito Barrier® (31.1 ml/liter, garlic oil [99.3% AI], and citric acid [0.5% AI]), and No-See-Um Organic Repellent® (99.5 ml/liter, lemongrass [4% AI], citronella [3% AI], castor oil [3% AI], sodium laurate [3%], and garlic oil [1% AI] in an 86% [AI] mixture of wintergreen oil, lecithin, and water). All products were compared with a commercial formulation of synergized pyrethrins, Riptide® (9.0 ml/liter, pyrethrins [5% AI], piperonyl butoxide [25% AI]), as a standard. Mortality was the greatest for Riptide to both mosquito species with effectiveness influenced by distance from the nozzle (ranging from >80% at 3 m to >10% at 20 m). The essential oil products resulted in <10% mortality for each species regardless of application exposure distance with the exception of EcoExempt, which gave ≈13% mortality of caged female Ae. albopictus 6 m from the nozzles.