Abstract
We studied the knockdown activity and lethal toxicity of 6 essential oil compounds-methyl salicylate, linalool, 2-phenethyl alcohol, eugenol, β-citronellol, and trans-cinnamaldehyde-as fumigants against adult female Culex pipiens pallens in the laboratory. Of the 6 products tested, trans-cinnamaldehyde was the most toxic (LC50 = 0.26µl/l air, 24h) with a slow knockdown time (KT95 = 176.5min at 0.5µl/l air). Methyl salicylate displayed a lower toxicity (LC50 = 1.17µl/l air, 24h) but the fastest knockdown activity (KT95 = 16.8min) at the sublethal concentration 0.5µl/l air. Furthermore, the binary mixture of methyl salicylate and trans-cinnamaldehyde exhibited a combined effect of fast knockdown activity and high toxicity against Cx. p. pallens adults, showing potential for development as natural fumigants for mosquito control.
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