Vol. 2, Issue 6 (2017)
Utility of y-maze olfactometer to check behavioral response of Aedes albopictus mosquito: A vector of dengue and chikungunya using essential oils
Author(s): Varun Tyagi, Piyali Dey, Johirul Islam, Ranjeet Patel, Hemanga Hazarika, Diganta Goswami, P Chattopadhyay
Abstract: Aedes albopictus mosquito is responsible for transmitting human diseases like dengue and chikungunya. Personal protection with insect repellents is a practical approach to reducing human mosquito contact, thereby minimizing disease transmission. Essential oils are natural volatile substances from plants used as protective measure against blood-sucking mosquitoes. In this present study, five essential oils were evaluated for their repellent effect against Ae. albopictus female mosquito in laboratory conditions using Y-tube olfactometer. The essential oils exhibited varying degree of repellency. Litsea oil showed -0.30±1.10, -0.43±7.0 and -0.57±0.9 effective mean repellency at 1 ppm, 10 ppm and 100 ppm respectively, while DEPA showed -0.14±0.75, -0.34±0.6 and -0.62±1.0 repellency at respective above concentrations. Statistical analysis revealed that among the tested essential oils, litsea oil had effective repellency in comparison with DEPA against Ae. albopictus mosquito at all concentration. Essential oils and DEPA showed significant repellence against Ae. albopictus (P< 0.05) at all 3 concentration tested. Litsea oil exhibited effective percentage repellency similar to DEPA. The essential oils are natural plant products that may be useful for developing safer and newer herbal based effective mosquito repellents.