Mosquito Repellent Test of Teak (Tectona grandis L.f.) Extract against Aedes aegypti (L.)
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Abstract
The repellent effect of teak (Tectona grandis L.f) extracted from maceration and soxhalation was determined against the laboratory and field collected strains of Aedes aegypti using anexcito – repellency test system. The mosquitoes were exposed to crude teak extract at different concentration at 0.5, 1, 2.5, 5 and 10% (w/v). It was found that crude teak extract exhibited both irritancy and repellency effects against the laboratory strain of Ae. aegypti Moreover, the extract from soxhlet method at 10% (w/v) showed the highest repellency action. Based on comparisons of the number of mosquitoes escaping from control and treated chambers in both contact and noncontact trials, the results indicated that escape responses of Ae. aegypti between Control Noncontact (CN) vs. Treatment Noncontact (TN) and Control Contact (CC) vs. Treatment Contact (CT) trials were statistically significant different (P= 0.01 and 0:03, respectively). The irritant and repellent responses demonstrated by Ae. aegypti to this plant extract in the current study contribute significant data to disease control programs in Thailand.
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