If Senegal is to compete on the global market, we cannot be using local methods that have not been properly researched,' he says. The biggest problem is dosage. Potency of the raw organic materials varies, depending on conditions. Researchers at the Institute for Agronomic Research in Senegal have found, for example, that the potency of neem changes with climate and soil conditions. Some organic solutions pose health risks.
Chilli powder is an excellent insect repellent but it causes serious skin and eye inflammations.
Other substances can be deadly. It kills not only insects but animals and humans. One time, after spraying near a creek, all the fish died and floated to the surface. We no longer recommend that peasants use it,' he said. When the farmers sprayed it on their plants, instead of repelling the insects it attracted them.