Use of ultra-pure pheromones for the manufacture of diffuser devices

A mechanical fixing device for trellising crops and releasing in a prolonged manner a pheromone, comprising a pheromone impregnated polymer, wherein the pheromone has an isomeric purity by weight equal to or greater than 90% and the pheromone is selected from the group consisting of insect pheromones,

• wherein the pheromone is present in the mechanical fixing device in a content of between 1% and 15% by weight relative to the weight of the mechanical fixing device
• wherein the polymer is selected from the group consisting of polyethylenes (PE), polypropylenes (PP), polystyrenes (PS), polyamides (PA), poly(meth)acrylates (PMA), polyesters, polylactides (PLA), polybutylene succinates (PBS), copolymers thereof, and mixtures thereof, and
• wherein the mechanical fixing device has a mechanical tensile strength and the mechanical tensile strength of the mechanical fixing device is not reduced by more than 10% relative to the same mechanical fixing device not impregnated with the pheromone.