Essential oils have been well-known for their antimicrobial properties for a very longtime. Some of them have been effectively used in human medicine for decades. Ourearlier investigation revealed a great potential of thyme and oregano essential oils ascrop protectants against some postharvest fruit pathogens. The effects of formulatedthyme and oregano essential oils on Monilinia laxa and Monilinia fructicola werestudied in vitro and in vivo. In vitro antagonistic assays were performed on solidified PDAmedium using a slightly modified agar overlay technique, while in vivo experimentswere conducted on inoculated apple fruits. In vitro essays showed that the developedformulations (emulsifiable concentrates - EC) significantly inhibited the mycelial growthof Monilinia spp. Experiments in vivo, performed on inoculated apple fruits, revealed thatthe developed formulations provided a significant level of Monilinia spp. suppression.To our knowledge, another EC formulation of oregano essential oil intended for usein Monilinia spp. control has never been developed before. The presented results areinitial findings and evaluation of the activity of the developed products should thereforeproceed under field conditions to determine their efficacy and activity spectrum, and toestimate economic aspects of their use.
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