Morocco has a large number of aromatic and medicinal plants, but this wealth remains untapped, especially for cosmetic and therapeutic purposes. These plants are used since centuries, allowing the moroccan population of several regions to accumulate expertise in herbal medicine. Among the secondary metabolites extracts of these plants, there are the essential oils which are mixtures of aromatic substances present in the form of tiny droplets in the leaves, peel fruit, resins, branches, and wood. These oils are a very interesting group, who are endowed with insecticidal properties. In order to find alternatives to chemical insecticides of synthesis, it is necessary to find and promote new phytosanitary practices that would have effects on the one hand, obtaining agricultural products of good market value, and on the other hand, respecting socio-ecological concepts of each ecosystem in preserving our environment in the long term. It is in this perspective that this study enrolled to evaluate the insecticidal activity of essential oils of three moroccan aromatic and medicinal plants: Thymus vulgaris, Mentha spicata and Citrus limonum. The results showed that the most important insecticidal activity was obtained for Thymus vulgaris essential oil followed by the Mentha spicata oil while the lowest activity was observed in Citrus limonum.