procedures for the interruption of mating of insect pest populations using a sexualpheromon - donor with persistent wirkstoffreigabe.

摘要

An improved method is proposed for the elimination of pest insects from the field by the disruption of mating of the insects distributing sustained-release dispensers containing the sex pheromone compound of the insect over the field. According to the invention, pheromone dispensers made from a polyolefin resin and filled with the liquid pheromone are subjected, prior to distribution over the field at a relatively low temperature in early spring, to a pre-treatment of keeping them at 35 DEG C or higher until the dispenser walls of the polyolefin resin absorb at least 2% by weight of the pheromone. When the dispensers after the pre-treatment are distributed, a relatively high rate of pheromone release can be obtained at the low temperature as compared with untreated dispensers so that the rate of pheromone release can be relatively uniform over the whole period of use of the pheromone dispensers.