Targeting an insect pest having a carboxylic acid compound as a pheromone substance and provided is a sustained release pheromone preparation enabling a high amount of pheromone to be released during the control period. More specifically, provided is a sustained release pheromone preparation and comprising: a carboxylic acid compound to be released, and an ethylene-vinyl acetate copolymer membrane through which the carboxylic acid compound can permeate and wherein the preparation is targeted for an insect pest having the carboxylic acid compound as a pheromone substance.
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