Annular sustained release preparation and production method thereof

Abstract

The present invention relates to an annular sustained release preparation for releasing a synthetic pheromone into the air in order to disrupt mating communication of insect pests and thereby controlling them.Provided an annular sustained release preparation comprising at least two polymer tubes having both ends sealed and integrated by pressure-welding, or at least one polymer tube and at least one polymer rod sealed and integrated at both ends by pressure-welding; and sex pheromone liquid contained by at least one of the tubes or the tube;wherein an annular space can be formed by pulling the tubes or the tube and the rod apart from each other at a center portion therebetween, the center portion not having been pressure-welded; and an angle formed between a line connecting respective centers of diameters of the tubes welded to each other or the tube and the rod welded to each other and a pressure application direction is from 0 to 45°. The invention also provides a method for producing an annular sustained release preparation.The invention further provides an annular sustained release preparation required to have a performance of stably releasing the sex pheromone for controlling insect pests.