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Different mixtures of monoterpenes (ketone, alcohol, and alkene) were loaded on paper discs and wax and their knockdown activities were evaluated against  Culex pipiens  adults. Some individual monoterpenes were also evaluated by residual toxicity technique. Citronella oil as a reference was also loaded separately or in combination with monoterpenes on paper discs and wax. The ketone monoterpenes mixture (camphor, menthone, carvone, and fenchone) on paper discs was the most active (KT 50  = 17.20 min) followed by ketone monoterpenes with citronella oil (KT 50  = 20.79 min) and citronella oil alone (KT 50  = 28.72 min). Wax formulations proved that the ketone and alcohol (geraniol, thymol, and menthol) monoterpenes gave the most activity as knockdown (KT 50  = 31.79 and 43.39 min, resp.). Alcohol monoterpenes formulation recorded KT 50  = 43.39 min. Residual activity of tested individual monoterpenes reported that the menthol was more toxic than camphor and camphene. Generally, this study suggests that the monoterpenes have the properties, which make them used as eco-friendly compounds in the control programs of  Cx. pipiens  adult. The use of paper discs is more applicable than wax in the adulticidal formulations.

journal of tropical medicine

Preparation of Ecofriendly Formulations Containing Biologically Active Monoterpenes with Their Fumigant and Residual Toxicities against Adults of<i>Culex pipiens</i>

Preparation of Ecofriendly Formulations Containing Biologically Active Monoterpenes with Their Fumigant and Residual Toxicities against Adults ofCulex pipiens