A sustained release pheromone formulation is provided in which once it issecured to a branch or other support, the likelihood of falling off issignificantlyreduced, and which is capable of being quickly attached to a small or largebranch.The sustained release pheromone formulation comprises a first sheet part and asecondsheet part which are provided by bending a single polymer sheet so that theyarearranged in a face-to-face manner, the sheet parts each having an engagingholetherethrough； a bend part located between the sheet parts； at least one sexpheromonesubstance that is carried on at least a part of the sheet parts； and slitseach extendingfrom the bend part to the engaging hole in each one of the sheet parts. Thisformulation can be secured to the rod-shaped support by guiding the rod-shapedsupportto the engaging holes via the slits and engaging with the holes.
