ABSTRACT - 602662 Disclosed herein is a water dispersion type sex pheromone sustained release preparation suitable for aerial spray over large-area agricultural fields or vast forests, which comprises at least: (i) an insect sex pheromone substance which is enclosed in a ring of an inclusion cyclodextrin, the inclusion cyclodextrin which encloses the insect sex pheromone substance, (ii) a non-inclusion cyclodextrin which does not enclose the insect sex pheromone substance, (iii) a water-soluble polymer, and (iv) water, wherein said insect sex pheromone substance is at least one insect sex pheromone substance selected from the group consisting of acetates, esters, aldehydes, alcohols, ketones, epoxides and hydrocarbons, each having 4 to 23 carbon atoms in total inclusive of the carbon number of unctional groups, and said water-soluble polymer is selected from the group consisting of polyvinyl alcohols, polyethylene glycols, polyvinyl pyrrolidones, sodium polyacrylates, polyacrylamides, carboxyvinyl polymers, p
