**5. Conclusions**

The managemen<sup>t</sup> of plant diseases using natural compounds is a grea<sup>t</sup> and important need nowadays. The present study has demonstrated the in vitro activities of seven essential oils and their efficacies against the fungi *A. alternata* and *S. cucurbitacearum*. These data show that the chemical compositions of essential oils can affect their antimicrobial activities. These essential oils were characterized by high proportions of oxygenated

monoterpenes followed by monoterpene hydrocarbons. Essential oil with citral, β-myrcene, and geraniol as major components (i.e., lemongrass [*C.cit*],) controlled these fungi most effectively, followed by essential oils containing terpinen-4-ol or linalool (i.e., marjoram [*O.maj1/2*], tea tree [*M.alt*], lavandin [*L.hyb*]). Antifungal activity of essential oils can be ascribed to individual effect of major components, and/or due to a synergistic effect of its minor components. Further studies are required to determine the effects of these oils as seed treatments, to evaluate their potential as preventive and curative treatments.

**Supplementary Materials:** The following are available online https://www.mdpi.com/2079-638 2/10/2/104/s1. Figure S1. Chromatogram of *Cympobogon citratus*. Figure S2. Chromatogram of *Lavandula dentata*. Figure S3. Chromatogram of *Lavandula hybrida*. Figure S4. Chromatogram of *Origanum majorana*1. Figure S5. Chromatogram of *Origanum majorana*2. Figure S6. Chromatogram of *Melaleuca alternifolia*. Figure S7. Chromatogram of *Laurus nobilis*.

**Author Contributions:** Conceptualization, M.M., G.R., K.M., and M.B.A.; methodology, M.M., G.R., B.N., L.P., H.B.A., K.M., O.K., and I.C.; software, M.M.; validation, M.M., G.R., and M.B.A.; formal analysis, M.M., G.R., and M.B.A.; investigation, M.M., G.R., M.B.A., and B.N.; resources, M.M. and B.N.; data curation, M.M. and B.N.; writing—original draft preparation, M.M., K.M., and B.N.; writing—review and editing, M.M., G.R., M.B.A., B.N., and L.P.; visualization, M.M., G.R., and M.B.A.; supervision, G.R. and M.B.A. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Data is contained within the article or supplementary material.

**Acknowledgments:** The company FLORA s.r.l. is acknowledged for kindly providing essential oils used for experiments.

**Conflicts of Interest:** The authors declare that they have no conflicts of interest.
