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Oilseeds, pulses, and cereals that are kept are seriously harmed by insects. These pests are found all over the globe and result in significant financial losses. Common Palaearctic heteropteran Pyrrhocoris apterus produces the macropterous and brachypterous wing morphs, two different wing types. In all of its geographic range, the cereal leaf beetle, Oulema melanopus (L.) (Coleoptera: Chrysomelidae), is a well-known and significant pest of cereals. The volatile chemical mixtures that make up essential oils (EOs) of plants are frequently used as bioactive agents. Effective antifeedants, pesticides, oviposition inhibitors, ovicides, and repellents include EOs. The present work aimed to determine the insecticidal effects of the essential oil (EO) of Lavandula angustifolia (LA) against Pyrrhocoris apterus and Oulema melanopus in different concentration. The best insecticidal activity of LAEO against P. apterus was found in 12.5 % concentration. The greatest insecticidal activity was gained against O. melanopus when LAEO concentration was 50 %. An all-natural alternative to synthetic pesticides, LAEO demonstrated insecticidal properties.