Colorado- beetle Leptinotarsa decemlineata (Coleoptera - Chrysomelidae) is the main pest of potato crops everywhere, and if near these cultures there are other solanaceous species, planted or from spontaneous flora, then it becomes as harmful for them. This paper is the result of research conducted on adults of the species of beetle Leptinotarsa decemlineata (Coleoptera - Chrysomelidae), carried out in laboratory conditions. The I generation adults were collected from the field immediately after coming out of hibernation and brought to the lab where they were installed in growth cages. To have as much information aspossible and to confirm the results five experimental variants have been achieved: First version - has not been treated; version 2 and 3 were those in which there were used alcoholic extracts of medicinal and aromatic plants, and version 4 and 5 were those in which the aqueous extracts were applied. As plants used were chosen: Satureja hortensis and Artemisia vulgaris. As a source of food for the monitored adults, young seedlings of tomatoes, peppers or eggplant were used. It was monitored and recorded the possibility that the substances applied to be a natural and organic method of combating Colorado-beetle and determine the most effective ways of conditioning applied products.