Abstract: Preparations from aromatic plants that are insecticidal or are insect behaviorally active, are used to control the development of insect populations. The plants are harvested after leaf maturation. Leaves are removed in a random pattern both as to individual plants and to location of leaves on each plant. The collection includes petioles but not stems. Leaves are milled with or without drying to a small average particle size. Extracts and vapors may also be used. The resultant preparation, when contacted with dry commodities infested with storage insects or with insect infested perishable produce after harvest will reduce the insect population.