A homegrown catnip lotion has proven “just as effective as Deet” as a mosquito repellant in trials carried out in Uganda.

Catnip, or Nepeta cataria, is a common herb from the mint family. The chemical in the plant that causes feline euphoria – nepetalactone – also has insect-repelling properties but this has not previously been commercialised.

New tools are vital in the fight against malaria, the disease spread by mosquitoes that infects about 282 million people a year and killed 610,000 in 2024 – the majority of them young children in African countries. There are concerns about rising resistance to insecticides, as well as the frontline drugs used to treat the disease.

In a study presented at the Society for Experimental Biology conference in Florence on Tuesday, a team working between Uganda and Wales found mosquitoes seeking a blood meal were less likely to land on people wearing lotions made from catnip.

Dr Simon Scofield, a senior lecturer at Cardiff University, said: “We found that a 6% catnip oil was just as effective as Deet, and the 2% catnip oil was only marginally less effective than that.