![]() ![]() ![]() Repairing one manhole cover costs just 3,000 won ($2.30). The researchers, funded by the Seoul Metropolitan Government, also praised the measures as more cost-effective than using pesticides. The same fishnets could also effectively block the opening of ventilation shafts, through which mosquitoes frequently exit the tanks. The experts suggested covering them with a fiberglass-based fishnet. ![]() Holes on manhole covers ― mostly where handles are ― also provide a gateway through which mosquitoes can come and go. Researchers have proposed sealing them off with polyurethane-based sealing tape ― such as those that retail as window tape sealing. Mosquitoes find their way to the open air through cracks around manhole covers. Blocking these paths worked better than using pesticides against the insects, according to the researchers. The Seoul Institute of Technology said Wednesday that a more effective way to keep the insects ― which mostly live in septic tanks or sewage tunnels in urban environments ― at bay is sealing off any cracks near manhole covers and covering open ventilation shafts connected to the tanks. Putting aside nasty pesticides, researchers in Seoul have concluded that one of the most effective ways to keep mosquitoes at bay is simple enough. Seoul researchers have found that a good way to keep mosquitoes away from humans doesn't involve any chemicals.
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