The hatching inhibition and knockdown rates against Aedes aegypti of two essential
oils (EOs): Cymbopogon citratus DC. Stapf and Illicium verum Hook F was evaluated. The
efficacy of each of these EOs, at 1, 5, 10% emulsion in water, stabilized by tween 60®
, was
compared to that of 1% w/v temephos and 1% w/w cypermethrin (common, harmful synthetic
insecticides). Topical and contact assays showed that 10% C. citratus and 10% I. verum
emulsions were the most effective in inhibiting the hatching of mosquito eggs (100%) after 48
hours of exposure. Moreover, they were also the most toxic against mosquito adults (100%
mortality) after 24 hours of exposure. This study also established that tween 60®
had no effect
on hatching inhibition or mortality rate of treated Aedes aegypti mosquitoes. All EO emulsions
were more potent than temephos and cypermethrin against these mosquito species. Coupling
this higher efficacy with no or benign known side effects of natural EOs, it can be concluded
that 10% C. citratus and 10% I. verum emulsions are better alternatives than temephos and
cypermethrin for a mosquito control program at the present time.
Keywords
Aedes aegypti, Cymbopogon citratus (Stapf.), Illicium verum Hook. F.
INTERNATIONAL JOURNAL OF AGRICULTURAL TECHNOLOGY
Published by : Association of Agricultural Technology in Southeast Asia (AATSEA) Contributions welcome at : http://www.ijat-aatsea.com
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