Originally coming from Sri Lanka, a tropical country where the mosquitoes are quite abundant at times, we used to have very smart and ecofriendly ways of controlling these biting pests. If you burn the cashew nut shells outside a premise, the mosquitos would be evacuated in no time. The cashew nut shell liquid/oil, is a resin found inside the cashew nut shell. Right now it is used as resin and to kill fungi and termites. Since it is not dissolvable in water, we can mix the cashew liquid with castor oil, or any eco-friendly oil like sweet almond oil etc creating a surfactant, a chemical that allows two liquids to mix. If we were able to spray this to hotspots of mosquito breeding grounds, it will kill mosquito larvae as well as it will prevent mosquitoes from laying eggs in the water at all. The mixture will serve as a repellent as well as a larvicide. The university can also consider installing the essential oil diffusers with these oils in buildings were these mosquito problem is severe, as the aroma will chase them away while being nontoxic and pleasant to human liking. Other approach we should take combined with this is keeping the water moving specially in the marshy land area in the Callaghan Campus where the mosquitos find breathtakingly attractive for breeding. As long as we create a motion of water using electric aeration pump or a fountain to create motion in water, the mosquito eggs won't survive.
Well, now that we created a beautiful view with a water fountain, with increased aeration in the pond which will make it healthier overall for the other wildlife you actually want, like fish or ornamental vegetation, why don’t we take our innovative idea a bit further? We can add some ornamental fish or other aquatic animals that love feeding on larvae. Some examples include Killifishes, topminnows, tadpoles. Another thing to remember is adult mosquitoes thrive in areas with moist plant life, like the lush vegetation that often surrounds ponds. It would be better if we can regularly cut back overgrown vegetation and remove weeds and dead plants. Bats, dragonflies, and other animals will also eat the mosquitoes. If you create habitat for these creatures, they’re more likely to hang around the pond and help control mosquito populations. Adding native species should help make it more inviting. It will be an ecofriendly approach if you make an effort to support such conservation efforts in your community to protect natural habitats. I think I have given quite a few ideas here. By the way, if you want to get very effective cashew shell oil, Sri Lanka will be able to provide truckload of that to an affordable price. Just shoot me an e-mail and I will be more than willing to contact the Sri Lankan suppliers for you supply good quality products for a reasonable price. We might even be able to commercialize this product.