A slow release formulation of sex pheromones of insects consisting of aldehydes, is herein described. The formulation consists of the bisulphite adduct of the aldehyde and a buffer having a pH value in the range from 2 to 10. The formulations herein described are employable for attracting and catching the insects in traps or for permeating the air in an infested area, in this way disturbing and preventing copulation.
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