This invention relates to a composition and procedure for manipulating the behaviour of codling moth larvae, Cydia pomonella (L.) (Lepidoptera: Olethreutidae). In particular, this invention relates to the use of specific pheromone components for manipulating the behaviour of C. pomonella larvae. A composition of chemicals for manipulating the behaviour of Cydia pomonella larvae, said composition comprising two or more chemicals in all possible combinations and ratios selected from the group consisting of: 1) heptanal; 2) 6-methyl-5-hepten-2-one (sulcatone); 3) myrcene; 4) octanal; 5) 3-carene; 6) (+)-limonene; 7) (E)-2-octenal; 8) nonanal; 9) (E)-2-nonenal; 10) decanal; 11) geranylacetone.
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