Enhancing the repellency of bugzout lotion through the addition of vanillin against dengue mosquito, Aedes aegypti Linn.

Issue Date

10-2011

Abstract

The repellence of three concentrations (18,170 and 340 mg/50 cm2) of Bugzout Lotion (33% botanical) against dengue mosquito, Aedes aegypti Linnaeus (Diptera::Culicidae), was compared with that of DEET, the commercially available mosquito repellent. Likewise, the addition of 1% vanillin to each concentration of Bugzout was evaluated for synergistic activity. In choice experiment, all concentrations of Bugzout, and DEET with or without vanillin are equally effective in repelling 100% of A. aegypti immediately after topical application on human skin. At 4 hours after application, 170 mg Bugzout + vanillin, 340 mg Bugzout alone or with vanillin, and DEET with or without vanillin provided 100% residual repellency against dengue mosquito. The two lowest concentrations of Bugzout alone gave the lowest repellency against dengue mosquito. At 8 hours after treatment, the highest concentrations of Bugzout + vanillin and DEET + vanillin still provided 100% repellency. The addition of vanillin in 85 and 170 mg Bugzout resulted in significantly higher mosquito residual repellency than that of the two lower concentrations of Bugzout alone. In no-choice experiment, all concentrations of Bugzout with vanillin and deet with and without vanillin were equally effective in repelling 100% of A. aegypti immediately after topical application on human skin. At 4 hours after treatment, the highest concentrations of Bugzout with vanillin and DEET with and without vanillin provided 100% residual repellency. At 8 hours after application, treatments without vanillin provided Iower degree of repellency, but the addition of vanillin maintained higher repellency against dengue mosquito at 4 and 8 hours after application. Treated forearms were continuously exposed from six minutes to adult mosquitoes. In the untreated forearms, mosquitoes landed their first bite in 18 seconds (s), while no mosquitoes landed in DEET- treated forearms. On the other hand, forearms treated with 85, 170 and 340 mg Bugzout had landing times of 38, 110, and 171 s, respectively. The addition of vanillin in all concentrations of Bugzout prevented the mosquitoes from landing their first bite.

Source or Periodical Title

The Philippine Entomologist

ISSN

0048-3753

Volume

25

Issue

2

Page

202

Document Type

Article

Frequency

semi-annually

Language

English

En – AGROVOC descriptors

AEDES AEGYPTI; INSECT CONTROL; REPELLENTS; VANILLIN; DIETHYLTOLUAMIDE

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