Popular plant acts as cult mosquito spray; scientists discover cheap alternative

A common plant, catnip, may offer a powerful and affordable alternative to commercial mosquito repellents, according to new research. Scientists studying the plant's oil found it to be highly effective at deterring mosquitoes, potentially providing a much-needed solution for communities struggling with insect-borne diseases and the cost of repellents.

The research, conducted by scientists in Uganda and Wales, focused on the essential oil derived from *Nepeta cataria*, commonly known as catnip. The key active compound, nepetalactone, has long been known to affect cats but also shows insect-repelling properties. Previous observations suggested its potential, but it had not been commercially utilized in this form.

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We discovered that catnip oil at a 6% concentration was as effective as DEET, and the oil at a 2% concentration was only slightly less effective.

Dr. Simon Scofield from Cardiff University reported that a 6% concentration of catnip oil proved as effective as DEET, a widely used but often expensive repellent. Even a 2% concentration showed significant effectiveness. "We discovered that catnip oil at a 6% concentration was as effective as DEET, and the oil at a 2% concentration was only slightly less effective," Scofield stated, as reported by The Guardian.

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It is beyond the price range of most rural Ugandan farmers living off their own crops, so buying commercially available repellents is simply not practical.

This finding is particularly significant for rural populations in Uganda, where DEET can be financially out of reach. "It is beyond the price range of most rural Ugandan farmers living off their own crops, so buying commercially available repellents is simply not practical," Scofield explained. The research team aimed to create a repellent that is not only effective but also accessible, allowing local communities to participate in its production at a minimal cost.

Field tests conducted in eastern Uganda involved volunteers applying either DEET, catnip oil preparations, or placebo creams to their legs. Researchers then counted the number of mosquitoes that landed on their skin over an evening. The results indicated that the catnip oil-based balm was a viable alternative to traditional repellents, offering hope for a more accessible and sustainable method of mosquito control.

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We wanted to create a repellent that is very effective, but also allows local residents to participate in the production cycle, so that it costs a minimal amount of money.