Therefore, finding alternatives to chemical fungicides that are considered safe, with negligible risk to human health and the environment, has become an exciting topic among researchers. EOs, which are naturally antimicrobial and antifungal substances, have received much attention and are considered as the biological antifungal agents that can replace synthetic pesticides [4; 12]. Their significant benefit is that many EOs are on the GRAS (Generally Recognized as Safe) list approved by the FDA (Food and Drug Administration), therefore they can be stated as safe for the consumers and the environment [13]. EOs are natural secondary metabolites, consisting mainly of monoterpenes and sesquiterpenes [14]. EOs are accumulated in cells, secretory cavities, or glandular hairs of plants, and they can be derived from one or more plant parts, such as the root (e.g., vetiver grass, angelica, valerian), stems and leaves (e.g., verbena, petitgrain, patchouli, geranium), leaves (e.g., mint, lemongrass, lemon balm, citronella), buds (e.g., clove), flowers (e.g., lavender, rose, jasmine, carnation, clove, mimosa, rosemary), fruits (e.g., lemon, orange, juniper) or their peels (e.g., orange, lemon, grapefruit), bark (e.g., cinnamon), rhizomes (e.g., ginger, calanus, curcumin, orris), and seeds (e.g., fennel, coriander, caraway, dill, nutmeg, pepper) [14; 15]. There are different methods for EO extraction, such as hydrodistillation, steam distillation, maceration, CO\({}_{2}\) extraction, solvent extraction, enfleurage, and cold press extraction [15]. Furthermore, different studies have shown that the extraction method has an influence on the content of individual compounds, the yield of EOs, and their activities. Due to different constituents of EOs and their biological properties (antioxidant, antibacterial, antifungal), they have wide applications, among others, in cosmetics (e.g., fragrances and lotions), in food products (e.g., flavorings and preservatives), in agriculture (e.g., insecticides and repellents), and in pharmaceutical products (e.g., therapeutic action and sanitary activity) [16; 17; 18; 19]. Studies conducted in recent years show that the application of EOs to control the pathogenic _Fusarium_ spp. that attack cereals and cereal products is very effective. For instance, mycelial growth was significantly or completely inhibited in the tested isolates of _Fusarium_ (_F. oxysporum_, _F. solani_, _F. verticillioides_, and _F. subglutinas_) by EOs of eucalyptus, clove, lemongrass, and mint [20,21]. In turn, the EOs of bay leaf, cinnamon, clove and oregano reduced fungal growth of _F. culmorum_ and _F. verticillioides_ by 90% to almost 100% [22]. In research conducted by [PERSON] et al. [23], the use of _Cymbopogon martini_ EO (from leaves of tropical herbaceous grass) in the encapsulated form with chitosan has significantly inhibited the growth of _F. graminearum_ through the reduction of ergosterol (ERG) content and increase in intracellular reactive oxygen species and lipid peroxidation [23]. In a similar study, [PERSON] and co-workers have reported the powerful effects of ginger EO against _F. graminearum_ in vitro through the ERG and DON reduction [4]. The inhibitory effect of EOs showed dose-dependent activity on the tested _Fusarium_ spp. In the presented study, the antifungal and anti-mycotoxicigenic effects of various concentrations of commercial palmarosa, cinnamon, and verbena EOs on the growth of _F. graminearum_ and biosynthesis of mycotoxins in wheat and maize grain were analyzed. The aim of the present study was to determine an inhibitory dose that effectively inhibits both the growth of _F. graminearum_ and mycotoxin biosynthesis. To our best knowledge, there are still limited data of complex EO analyses taking into account the relationship between the concentration and the effectiveness of their action. In relation to earlier research, where the main purpose was comparison of the antifungal and antimycotoxician activity of selected EOs against _F. graminearum_ and _F.