BHOPAL: Scientists at Defence and Research Development Organization (DRDO), Gwalior in Madhya Pradesh, have developed a lethal death trap based on lure and kill strategy to combat dengue transmitting aedes mosquitoes.
The device, which has come at a time when India has recorded 35,000 dengue cases and over 400 fatalities till January 2012, would help immensely to implement control method in short time, claim researchers.
After 72 hours, post-blood meal gravid mosquitoes intensely search for egg laying site using vision and sense of smell. At this stage, they are weak fliers. The parasite spends lot of time in assessing suitability of water to lay eggs. If this water is treated with a suitable oviposition stimulant/attractant, gravid females spend more time to lay most of eggs.
A team of entomologists led by Thangaraj Seenivasagan at DRDO, Gwalior, exploited this behaviour mediated by chemical factors that modify behaviour of gravid female mosquitoes at treated oviposition sites.
Kavita Sharma, a research fellow conducted systematic oviposition bioassays and observed huge number of eggs being deposited onto propyl octadecanoate (PO) treated water surface for up to one week by the female of anopheles stephensi and aedes aegypti under laboratory conditions, among a series of sixteen ester compounds synthesized by chemists A N Rao and Ganesan.
Research found that the gravid females are attracted to treated water by fruity smell of propyl octadecanoate and killed by minute quantity of insecticide as soon as they touch water for egg laying.
The research organization has now developed a prototype of lethal ovi-trap for mosquitoes. The results are promising under laboratory conditions, which will undergo rigorous testing under semi-field and field conditions before being deployed for control dengue mosquitoes in various endemic locations in the country.
M P Kaushik, director, DRDO, is of the opinion that the technology, as part of integrated vector management, would help reduce dengue transmission.
Egg laying activity targeted
Researchers targeted this period of peak activity of gravid female mosquitoes, which intensely search for oviposition sites (any water body- holding as low as 100ml of water=tea cup size) with visual and chemical smell releasing from water source. If mosquitoes do not find any water body in 7 days, they automatically die because of eggs in their abdomen.
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