Essential Oils in Postharvest Treatment against Microbial Spoilage of the Rosaceae Family Fruits

: Fruits undergo numerous chemical, physical, and microbiological changes during storage that shorten their postharvest life, reducing shelf-life and boosting food loss. Food quality and safety are seriously threatened by postharvest infections, one of the factors behind postharvest deterioration and mycotoxin contamination in fruits. The control of postharvest deterioration is a big concern because there are few management methods available. Several attempts have been undertaken to prevent the microbial degradation of fresh food at the postharvest stage without using synthetic fungicides, which are dangerous for the environment and people’s health. A good substitute for synthetic fungicides among them is the use of natural plant compounds, such as essential oils included or not included in the edible coatings. This review’s aim was to collect information from the scientiﬁc literature on the biological activity of essential oil, with or without edible coatings, against pathogens that cause the postharvest spoilage of many fruit belonging to Rosaceae family in order to develop appropriate substitute tactics for synthetic fungicides in the treatment of postharvest fruit diseases. Advances and obstacles surrounding emerging methods that may be useful for enhancing the effectiveness and dependability of essential oils were evaluated.


EOs' Chemical Composition
Botanical active ingredients for plant-based goods are obtained differently from synthetic chemical active ingredients. Whereas botanical active ingredients are obtained via the processing of biologically derived material, synthetic chemicals are created through chemical processes [37]. In botanicals, there is a subcategory that includes EOs, defined according to the U.S. Environmental Protection Agency (EPA): "Essential oils are mixtures of natural substances that come from various parts of plants, such as flowers, fruits, and wood. They are responsible for the distinctive odor or flavor of the plant they come from". Plant-derived EOs are thought to be non-phytotoxic substances and may be useful as phytochemicals to protect crops. They include intricate combinations of active secondary metabolites that have antibacterial, allelopathic, antioxidant, and bioregulatory activities [38]. The number of molecules, the stereochemical characteristics, and the extraction method affect the chemical composition of EOs. The quality, quantity, and content of the extraction products may vary according to the environment, soil composition, plant organs, age, and vegetative cycle stage (chemotypes) [39]. Due to their verified safety, widespread public acceptability, and potential for several purposes, EOs from various plants are garnering interest.
Over 300 distinct chemicals constitute EOs, although most of them are volatile substances with molecular weights below 1000 Da (often 300 Da). In contrast to other compounds, which are present in trace levels, a select few chemicals are essentially present as large ones at roughly 20-70% (Table 2) [40].
A large class of chemicals in EOs that are known to have antimicrobial action are terpenes and terpenoids. Terpenes represent a wide group of hydrocarbons, characterized by different chemical structures, constructed from isoprene units C 5 . They are classified into numerous categories based on the number of isoprenic units, including emiterpenes (C 5 ), monoterpenes (C 10 ), sesquiterpenes (C 15 ), diterpenes (C 20 ), sesterterpenes (C 25 ), triterpenes (C 30 ), and tetraterpenes (C 40 ).
Terpenoids are also found in EOs. They are defined as terpene molecules with a methyl group that has been transposed or eliminated. The terpenoids can be oxidized and found as esters, aldehydes, ketones, alcohols, ethers, and epoxides. Approximately 90% of EOs include monoterpenes, which make up most of their constituent parts. These often have a nice odor, and they are volatile. The monoterpenes are significantly involved in the synthesis of a wide range of structures. Carvacrol, geraniol, eugenol, thymol, linalyl acetate, linalool, citronellal, citronellol, and terpineol are examples of terpenes and terpenoids ( Figure 1). Thymol and carvacrol are the two main components of thyme and oregano EOs. Bouchra et al. [41] demonstrated that the essential oil of Origanum compactum Benth., which contains carvacrol (58.1%), p-cymene (11.4%), and thymol (9.0%) as major components, was more toxic against BC. Additionally, according to Pérez-Alfonso et al. [42], thymol and carvacrol demonstrated substantial antifungal efficacy against postharvest pathogens such as Penicillium digitatum, P. italicum, Fusarium spp., and Aspergillus spp. Citronellol, octanal, citral, decanal, nonanal, β-pinene, linalool, and γ-terpinene, present at a high quantity in citrus EOs, showed antifungal properties against P. italicum, whereas octanal, decanal, nonanal, limonene, citral, α-terpineol, and linalool showed antifungal properties against P. digitatum [43]. According to Cai et al. [44], menthol caused serious membrane lipid peroxidation and the generation and accumulation of reactive oxygen species in Geotrichum candidum var. citri-aurantii, which led to the breakdown of the integrity of the plasma membrane of the pathogen.
properties against P. digitatum [43]. According to Cai et al. [44], menthol caused serious membrane lipid peroxidation and the generation and accumulation of reactive oxygen species in Geotrichum candidum var. citri-aurantii, which led to the breakdown of the integrity of the plasma membrane of the pathogen.
The second category of compounds mainly present in EOs was phenylpropanoids, which consist of aromatic substances such as benzyl, phenylethyl, and phenylpropyl. They are biosynthesized by the shikimate pathway. Typically, they have a benzene ring (C6H6) bonded to a three-carbon chain. Important phenylpropanoids and derivatives are anethole, estragole, cinnamaldehyde, eugenol, safrole, apiol, vanillin, and benzaldehyde ( Figure 2). Kalleli et al. [45] demonstrated that fennel essential oil (composed of 78% transanethole) reduced the severity of the infection caused by Fusarium oxysporum f. sp. lycopersici by 98% in treated plants with the oil, eight weeks after inoculation. The cinnamaldehyde and estragole had inhibitory activity against Pseudomonas syringae pv. actinidiae at a concentration of 1.250 and 2.500 ppm [46]. The Ocimum sanctum L. essential oil, which has a wide range of fungitoxic properties and was also found to be effective in lowering the incidence of AF in raw materials (roots) of Rauvolfia serpentina (L.) Benth. Ex Kurz during storage, was found to be primarily composed of eugenol, followed by β-caryophyllene The second category of compounds mainly present in EOs was phenylpropanoids, which consist of aromatic substances such as benzyl, phenylethyl, and phenylpropyl. They are biosynthesized by the shikimate pathway. Typically, they have a benzene ring (C 6 H 6 ) bonded to a three-carbon chain. Important phenylpropanoids and derivatives are anethole, estragole, cinnamaldehyde, eugenol, safrole, apiol, vanillin, and benzaldehyde ( Figure 2). Kalleli et al. [45] demonstrated that fennel essential oil (composed of 78% trans-anethole) reduced the severity of the infection caused by Fusarium oxysporum f. sp. lycopersici by 98% in treated plants with the oil, eight weeks after inoculation. The cinnamaldehyde and estragole had inhibitory activity against Pseudomonas syringae pv. actinidiae at a concentration of 1.250 and 2.500 ppm [46]. The Ocimum sanctum L. essential oil, which has a wide range of fungitoxic properties and was also found to be effective in lowering the incidence of AF in raw materials (roots) of Rauvolfia serpentina (L.) Benth. Ex Kurz during storage, was found to be primarily composed of eugenol, followed by β-caryophyllene and germacrene D [47]. The growth of CA, CG, and Botryodiplodia theobromae, three important postharvest pathogens of fruits, was reduced in vitro by the EOs of Piper auritum Kunth and P. holtonii C.DC., which were primarily composed of safrole and apiol [48]. Vanillin treatment in vivo and in vitro increased the BC and AA membrane permeability, inhibiting the pathogenicity-related enzyme activities and reducing the infection ability of fungi [49]. and germacrene D [47]. The growth of CA, CG, and Botryodiplodia theobromae, three important postharvest pathogens of fruits, was reduced in vitro by the EOs of Piper auritum Kunth and P. holtonii C.DC., which were primarily composed of safrole and apiol [48]. Vanillin treatment in vivo and in vitro increased the BC and AA membrane permeability, inhibiting the pathogenicity-related enzyme activities and reducing the infection ability of fungi [49].

Essential Oils' Effects on Human Health and the Environment
In addition to increasing costs, handling risks, worries about plant protection product (PPP) residues in food, and threats to human health and the environment, the extensive use of PPPs has serious negatives [51]. Finding better substitutes for PPPs made of synthetic chemicals has become more popular because of growing public awareness of these concerns. In line with the current trend of investigating new options for extending storage life, techniques that reduce horticultural product degradation while minimizing negative effects on human health or the environment must be prioritized [52]. Natural plant additives with pesticidal and antimicrobial action are one such alternative; they tend to be less poisonous to mammals, have fewer negative impacts on the environment, and are well-liked by the general population. EOs and other natural plant products are regarded as more biodegradable than synthetic substances. There are significant worries about the potential negative impacts of EOs on human health and the environment, which are still under investigation. EOs are extracted using a variety of contemporary and conventional procedures, including steam distillation, hydrodistillation, ultrasonic, ohmic, and microwave-aided hydrodistillation, and supercritical fluid extraction [53,54]. Conventional techniques have a few drawbacks, including a lengthy extraction process, low efficiency, solvent toxicity, and a detrimental effect on the environment. Modern techniques are now preferred over traditional approaches or extraction methods because they are quicker, more effective, use less energy, and produce more EOs with a low negative effect on the environment [55].
To date, there are more studies describing the beneficial effects of EO consumption on human health than there are studies attesting to their toxicity. EOs are typically known to be non-toxic for humans and other mammals, as they are quickly absorbed and processed in the liver and eliminated by the kidneys [56]. Ezeorba et al. [57] reported that garlic EOs possessed interesting medical properties, such as antimicrobial, cardio-protective, anti-cancer, anti-Alzheimer, anti-diabetic, and immunomodulatory activities. According to studies by Loizzo et al. [58] and Koul et al. [59], limonene, which is the compound that most characterizes lemon and citron EOs, had lymphotonic, powerful diuretic, healing, scalping tonic, antifungal, anti-moth decongestant, antiseptic respiratory, purgative, relaxing, and comforting actions. Menthol and menthone, mainly found in mint essential oil, has shown tonic, stimulant, decongestant, anesthetic and analgesic, cooling, and anti-inflammatory properties [60]. Cinnamon essential oil, particularly cinnamaldehyde, was described as a potent antibacterial, antifungal, antiviral, anticoagulant, and uterine tonic [61,62].

Use of Essential Oils to Control Postharvest Microbial Spoilage
The antimicrobial properties of EOs have been described in several studies. EOs have been shown to have a wide range of antifungal properties and have the advantage of being environmentally friendly [59,63,64]. EOs are natural compounds that show antifungal activity, and they can be used instead of synthetic fungicides. Several studies demonstrated that EO activity appears to be stronger in vitro than in vivo, which is necessary to confirm the in vitro results with in vivo tests.
There are several modes of action of EOs that make them natural fungicides, e.g., they interact with ergosterol, which is essential for maintaining cell integrity as well as fungal function, viability, and growth; they can pass through the lipid bilayer of the cell membrane, increasing permeability and causing cell death or the inhibition of fungal germination and sporulation; and phenolic compounds interact with porins, causing ion leakage and cell breakdown [65][66][67].
Due to their low permeability, uncontrolled volatility, and low solubility, the commercialization of EOs is restricted. To avoid these limitations, there are different strategies, such as developing proper formulation by the encapsulation of EOs in nanoemulsion or developing edible coatings [68,69]. EO concentrations require careful optimization depending on fruit crops. Although, in in vitro tests, the efficacy is directly correlated with the EO concentration, when applied to fruit, EO vapors could have phytotoxic effects, which reduce the treatment efficacy [9]. Many factors, such as the chemical composition, environmental factors, targeted pathogens, botanical sources, and type of food to be treated can affect the antimicrobial action of EOs [70,71]. Below are studies on the effectiveness of EOs in vitro and in vivo on postharvest pathogens responsible for fruit decay and food wastage, divided by pome (apple and pear) and stone fruits (sweet cherry, apricot, peach, strawberry, and plum).

Pome Fruits
Fresh fruits are a favorable habitat for pathogenic and spoilage fungi and bacteria due to their concentration of nutrients, such as sugars, and the high moisture [72,73]. All bioassays cited in this paragraph are reported in Table 3. cinnamon, pimento, and laurel Spray [33] Cinnamomum zeylanicum, Zataria multiflora, and Satureja khuzestanica Macro-sized bacterial cellulose coating emulsion [77] Pelargonium graveolens Volatile activity test [78] Fennel oil Films were prepared with SSOS, chitosan Vapor [79] Thyme and savory Fumigation [34] Colletotrichum acutatum and C. The major fungal pathogens that have been associated with losses in the quality of pectin-rich fruits, such as pear and apple fruits, include PE, the causal agent of blue mold, and BC, the causing factor of gray mold [84][85][86][87].
The antifungal effects, both in vitro and in vivo, of the rosemary, eucalyptus, thyme, cinnamon, and marjoram EOs and their combination against BC and PE, as well as their effects on quality attributes, were highlighted, and their possible use as natural fungicides in the fresh fruit industry for postharvest disease control was encouraged [28,83]. Specifically, the in vitro treatment with 300 µL L −1 eucalyptus EO (EuEO,) 300 µL L −1 rosemary EO (REO), and their mixture revealed a decrease in spores germination and fungal colonies of PE. Their application in vapor form on fresh pears in vivo led to an increase in the respiration rate and a reduction in the growth of PE lesions [28]. Nikkhah [83] investigated the antifungal activity of thyme, cinnamon, rosemary, and marjoram EOs and the synergistic activity of their combinations. In vitro, thyme EO (TEO) and cinnamon EO (CEO) demonstrated the highest antifungal activity and the lowest minimum inhibitory concentration (MIC) against PE and BC. A remarkable synergistic interaction was observed in the thyme/cinnamon dual combinations against both mold species. Fractional inhibitor concentration analysis (FICi) and in vivo treatments indicated that the triple combination of cinnamon/majoran/thyme produced the most synergistic antifungal effect. In accordance with the previously mentioned study, in vitro experiments demonstrated that the CEO significantly inhibits PE. In vivo, the multi-layer coating, formed by chitosan (1% w/v), sodium alginate (1% w/v), and CEO (4% v/v), showed a more significant and lasting inhibition of PE in two varieties of apples, 'Guoguang' and 'Huangyuanshuai', compared to a single-layer coating with chitosan and CEO or sodium alginate and CEO [81].
PE produces patulin, a mycotoxin hazardous to consumer health. Zhou et al. [82] demonstrated that exogenous EO decanal in in vitro tests (0.12 g L −1 ) reduced the PE growth and, in in vivo tests (0.24 g L −1 ), controlled the effect against blue mold rot on apples and pears; moreover, EO decanal inhibited patulin production.
Apple is one of the most important fruits in international trade and can suffer severe postharvest losses during transport and storage. BC, which causes gray mold, is one of the main pathogens causing postharvest losses [88]. The use of TEO at a 1% v/v concentration showed high efficiency in reducing the damage and incidence of BC symptoms and could be used as an effective postharvest treatment in stored apples. Furthermore, treatment with TEO increases the expression of the specific pathogenesis-related gene PR-8, suggesting an induction of resistance against BC through the priming of defense responses in apple fruit [26]. In vitro, the application of Zataria EO (ZMEO, 300-1200 µL L −1 ) and CEO (300-1200 µL L −1 ) presented inhibitory effects on BC and PE. This result was confirmed by in vivo tests, where the lesion diameter in inoculated apples was reduced by the ZMEO (600-1200 µL L −1 ) and CEO (600-1200 µL L −1 ) [77]. Sadat Razavi et al. [77] demonstrated that BCNCs/GelA-CEO (75-2400 µL L −1 ) emulsions decreased BC and PE lesions on inoculated apples, with a better performance of non-encapsulated EO. The strongest effect was shown at the highest concentration of CEO, with which lesions on the fruit skin were barely detectable (Figure 3).  The incorporation of fennel EO (FEO) in a starch sodium octenyl succinate/ch film (mass ratio SSOS/glycerol/FEO/chitosan was 1:0:2:1:0.5) for apple fruit showed antifungal activity, in vivo and in vitro, against BC, TR, and PE. Moreover, the c reduced the respiration rate and weight loss whereas the firmness, peel lightness, s solids, and titratable acid content were maintained [79].
The treatment of the apple cultivar 'Opal' with 1% TEO and summer savo (SSEO) by fumigation shows significant gray mold control after 60 days of storage a confirming the results obtained in vitro, where the application of thyme and savor The incorporation of fennel EO (FEO) in a starch sodium octenyl succinate/chitosan film (mass ratio SSOS/glycerol/FEO/chitosan was 1:0:2:1:0.5) for apple fruit showed good antifungal activity, in vivo and in vitro, against BC, TR, and PE. Moreover, the coating reduced the respiration rate and weight loss whereas the firmness, peel lightness, soluble solids, and titratable acid content were maintained [79].
The treatment of the apple cultivar 'Opal' with 1% TEO and summer savory EO (SSEO) by fumigation shows significant gray mold control after 60 days of storage at 1 • C, confirming the results obtained in vitro, where the application of thyme and savory EOs significantly reduced the growth of BC [34].
An application that allows for a uniform distribution of EOs and enables a small quantity to be used is the thermofogging treatment. Applying lime EO (LiEO), lemon EO (LeEO), and lemongrass EO (LgEO) on the 'Golden Delicious', 'Pink Lady', and 'Granny Smith' cultivars at a concentration of 0.016-1% results in a significant inhibition of the mycelial growth and spore germination of BC, resulting in a reduction in the decay of the apples [31].
In contrast, Sapper [75] evaluated that adding a starch-gellan (80:20 w/w) coating formulation with the incorporation of TEO (0.25 and 0.5 per g of polymer) directly or encapsulated in lecithin promotes the respiration rates and quotient in apples, but no antifungal action against BC was observed in vivo, despite in vitro tests and other studies proving the opposite.
Geranium essential oil exhibits significant antifungal activity against RS, PE, and BC in vitro using poisoned food [78]. Despite in vitro tests demonstrating the effectiveness of CEO, pimenta EO (PPEO), and laurel EO (LaEO) against BC, these had no significant effects in in vivo tests carried out on 'Connel Red' apples during storage, except for cinnamon extract even at high concentrations [33].
Several studies have shown that the higher the concentration of the essential oil, the greater the inhibition of the mycelium growth of pathogenic fungi, but a concentration of 10% was found to be phytotoxic to fruit [27,80]. Furthermore, the efficiency of EOs in inhibiting BC and PE depends not only on the concentration and type of oil but also on the cultivar and storage time [27]. The treatment of 'Golden Delicious', 'Granny Smith', 'Red Chief', and 'Royal Gal' apple cultivars with the emulsion at 1% of oregano EO (OEO), SSEO, and TEO dropped into the artificial wound inoculated with BC and PE showed a decrease in the lesion compared to the control [27].
Other pathogenic fungi causing postharvest disease in pome fruit are ML and MFG, causal agents of brown rot. These fungi cause blossom blight, twig cankers, fruit rot, and fruit mummification in the orchard [7].
EuEO, mint EO (MiEO), REO, OEO, lavander EO (LEO), clove EO (ClEO), TEO, Zanthoxylum bungeanum EO (ZBEO), and OEO were tested, in vitro and in vivo, against ML and MFG. In vitro tests showed significant antifungal activity of EOs that reduced mycelial growth and spore germination. In in vivo tests, a concentration of 100 µL mL −1 of ClEO, TEO, ZBEO, and OEO reduced the brown rot incidence, spore germination, and lesion diameter. Fruit quality parameters such as weight loss, total soluble solids, titratable acidity, firmness, and the maturity index were preserved during storage at 4 • C for 20 days [69].
LgEO has shown antifungal activity against the two fungi responsible for apple bitter rot CA and GC. In vitro tests demonstrated that the use of poly(lactic acid) nanocapsules containing LgEO at a dosage of 0.1% (v/v) resulted in fungicidal activity against both phytopathogenic fungi [80]. In vivo tests confirmed that apples treated with encapsulated essential oil show significantly lower bitter rot lesions than those treated with non-encapsulated EO. This is because the active compounds are released more slowly if the EO is contained in nanocapsules and there is a reduction in the necrotic effects by essential oil terpenoids [80].
Adding Na-alginate coating supplemented with 0.3% and 0.9% v/v CEO to pear and apple slices or wounded skin limits the growth of the fungus AC and the production of ochratoxin A. This could be a strategy for limiting spoilage losses and preserving consumer health [74].
Additional studies showed the antimicrobial effect of EOs on total molds, yeast, and mesophilic microorganisms of pome fruit, the main results of which are reported in Table 4. Further analysis may be necessary to evaluate the efficacy against the postharvest pathogens mentioned in this review.

Stone Fruits
All bioassays cited in this paragraph are reported in Table 5.  Monilinia spp. are responsible for brown rots in stone fruits, which are postharvest diseases that cause significant fruit losses [121]. TEO and vervain EO (VEO) showed fungicidal activity against MFC, ML, and MFG in the bioassay on peaches, where a concentration of 1000 ppm and 500 ppm for VEO and TEO, respectively, reduced the brown rot lesion on tested peach fruits [100].
Thyme essential oil is also effective against other postharvest pathogens. In fact, Alamri et al. demonstrated the efficacy of a new coating material to protect peaches against postharvest fungal infections, which contains EOs of mint and thyme (1 mL L −1 ), gum arabic (10% w/v), and Tween 20. The preparations succeeded in slowing down disease development in vivo and reducing fungal growth in vitro at different temperatures. The fruits were kept in cold storage for up to one month, with very low levels of disease incidence and severity due to the application of the developed materials [98].
Naturally contaminated nectarines and peaches were exposed to TEO and SSEO by biofumigation in order to control postharvest diseases and maintain fruit quality. These EO vapors showed high antifungal activity against MFC, reducing fruit rot incidence during shelf-life. In contrast, BC was less sensitive to the treatments with EOs and in vitro tests confirmed the in vivo results. Moreover, EO vapors reduced weight loss and maintained the carotenoid and ascorbic acid content [9]. The effectiveness of the spike lavender, lavender absolute, dill weed, rosewood, FEO, and benchmark TEO against BC, MP, PE, and RS was examined in vitro using both the solid-phase diffusion method and the vapor-phase diffusion method, and in vivo on peach fruits. The results of in vitro and in vivo tests showed that rosewood EO, used in the vapor-phase, prohibited the hypha growth and spore germination of BC, MP, PE, and RS at a concentration of 300 µL L −1 , keeping the quality of the peach fruit intact [99]. TEO and LgEO inhibited the growth of BC, PE, and RS mycelia by 25 and 50%, respectively, in vitro. Furthermore, the efficacy of a delivery system helps to reduce an unpleasant odor and taste resulting from the use of EOs. The EOs combined with the fungi antagonist Bacillus amyloliquefaciens in peach fruits were evaluated. The current investigation showed the potential of adopting B. amyloliquefaciens in a biodegradable modified atmosphere (MAP) pad delivery system in conjunction with LgEO to improve the postharvest life of peach fruits and reduce the growth of BC, PE, and RS [97].
Tea tree EO has a strong antifungal activity against MFC in vitro and in inoculated peaches. Tea tree EO changes the mycelial morphology, membrane permeability, and levels of intracellular ROS [103]. O. americanum and C. winterianus acted as antifungals, drastically reducing the growth of MFC and BC on peach fruits [105].
The use of coating or polysaccharide-based film avoids the problem of the uncontrolled volatilization of EOs and inhibits the growth of bacteria and fungi, allowing for a longer preservation of postharvest fruits [122][123][124][125]. Lian et al. [102] tested different chitosan-based films, also adding other polysaccharides, in order to improve the film matrix composition and the antifungal proprieties; specifically, they used films composed of: chitosan 1.8% (w/v), chitosan 1.2% and xanthan gum 0.6% (w/v), chitosan 1.8% and pullulan 0.6% (w/v), chitosan 1.8% and gum tragacanth 0.6% (w/v), and chitosan 1.8% and Arabic gum 0.6 (w/v).
The use of thyme essential oil chitosan-Arabic gum composite film on peach fruit by coating or fumigation was the most effective in improving the hydrogen bonding interaction among the film matrix and stabilized the antifungal activity of TEO against MFC. Similarly, chitosan-Arabic gum composite films (1.8-0.6% w/v) with the incorporation of thyme EO reduced the lesion diameter of brown mold caused by MFC on the nectarine [103].
Treating 'Spring Princes' and 'Sonnet' peaches with TEO vapor leads to an increase in the total phenolic content and activities of defense-related enzymes and a reduction in brown rot lesion disease [101]. Among 26 EOs, only M. spicata, M. piperita, TEO CT carvacrol, and TEO CT thymol exhibited a strong inhibition on RS growth in the screening in vitro. Regarding the in vitro results, only peppermint EO (PEO) showed a consistent and substantial effect in limiting lesion growth on peach fruit inoculated with RS, whereas all four essential oil treatments reduced disease development [120].
The microcapsules of lilac EO (LLEO) showed strong antifungal activity against AA and BC, and the peaches' quality attributes were maintained [95].
EOs extracted from galangal (GaEO), cortex EO (CoEO), and artemisia EO (ArEO) showed antifungal activity against pathogens causing postharvest diseases in peaches, such as PE, BC, AF, AA, RS, and MFC. A compound preparation based on the optimized concentration of three EOs was made into a microemulsion and was demonstrated to have greater antifungal activity [96].
The use of TEO and ClEO on apricots had a significant effect on the fruit quality and reduced the incidence and disease severity of MFC and BC, causal agents of gray and brown mold, respectively [10].
A key factor in fruit storage deterioration is pathogen attack. One of the most significant postharvest pathogens in terms of economic impact is gray mold fungi, which is brought on by BC [125].
Chitosan (0.15%) and ZMEO and CEO (0.15%) exhibited antimicrobial power against BC. Furthermore, the synergy between chitosan and essential oil (1:1 ratio) also showed antimicrobial power in vitro against BC. Similarly, strawberries treated with chitosan, ZMEO, CEO, and their combinations showed a significant reduction in the severity of BC compared to control fruits at the end of storage (Figure 4) [110]. Next, the antimicrobial power against BC was tested using an Aloe vera coating embedded with two different concentrations (500 and 1000 µL L −1 ) of basil essential oil. After 12 days of cold storage, strawberries treated with A. vera and the higher concentration of basil essential oil displayed the suppression of BC mycelium growth in comparison to the control, with no change in the physico-chemical and sensory properties of the fruit [113].
ZMEO, CEO, and their combinations showed a significant reduction in the se compared to control fruits at the end of storage (Figure 4) [110]. Next, the an power against BC was tested using an Aloe vera coating embedded with two d centrations (500 and 1000 μL L −1 ) of basil essential oil. After 12 days of cold sto berries treated with A. vera and the higher concentration of basil essential o the suppression of BC mycelium growth in comparison to the control, with n the physico-chemical and sensory properties of the fruit [113].   [105].
PEO and EuEO used in combination (1:1 v/v) and the peppermint essential oil completely suppressed the in vitro growth of BC mycelium, whereas the EuEO and the Moringa FO coating were less effective. The outcomes of the in vitro tests were confirmed in vivo, with moderate fungus growth when EuEO and Moringa fatty oil were used as treatments, and BC was completely inhibited in strawberry samples treated with a combination of PEO and EuEO, or without PEO [115].
Furthermore, sage oil (SaEO) at 1000 µL L −1 was able to completely inhibit the growth of BC mycelium in vitro. With bioassay studies, it was confirmed that the concentration of 60 µL L −1 of SEO was a valid tool for controlling fungal infection, with a low effect on the quality of strawberry fruits [108]. At a concentration of 150 µL L −1 , TEO, Rosalina EO (RosEO), GaEO, PEO, palmarosa EO (PalEO), LgEO, and OEO completely inhibited BC's mycelial growth, whereas, at a concentration of 100 µL L −1 , only LgEO, TEO, and OEO showed complete mycelial inhibition. The in vitro findings reveal that TEO and OEO were particularly effective at preventing postharvest gray mold on strawberry fruit. Exposure to OEO also preserved the fruit quality by preventing the natural deterioration in strawberry [114]. The CEO emulsion and nanoemulsion both exhibited a 100% deterrent percentage in vitro against BC at 500 µL L −1 and against RS at 1000 µL L −1 . The fruit infection rate was lowest (5.43%) in the strawberry fruit treated with CEO nano-emulsion at a concentration of 0.2%; moreover, it had a significant impact on preventing fruit degradation [111]. The in vitro growth of BC was fully inhibited by LgEO, litsea EO (LitEO), LEO, PEO, MiEO, LeEO, SaEO, and TEO at a concentration of 625 µL L −1 . Strawberry fruits that had been purposefully inoculated with BC, TEO, PEO, LgEO, and LitEO were examined in vivo. At concentrations of 250 or 500 µL L −1 , all four EOs exhibited high inhibition; however, at a dose of 125 µL L −1 , only PEO was able to prevent the growth of BC lesions. However, these EOs changed the sensory quality of strawberries. Nevertheless, LgEO and LitEO EOs seem to be acceptable for consumers when applied at a 125 µL L −1 concentration [116].
The name of the disease produced by RS, soft rot, already describes the distinctive symptom: a soft, watery rot with juice leakage that, in conditions of high moisture, is covered by mycelium and contains pathogen structures [126]. PEO displayed an antifungal activity on strawberries artificially inoculated with RS at 86, 84, and 59% after 24, 48, and 72 h of inoculation, respectively. Furthermore, MiEO, TEO CT carvacrol, and TEO CT thymol also exhibited a fair amount of antifungal power, but much less than PEO [120]. The essential oil of EuEO showed great antifungal capacity in vitro against BC and RS at concentrations of 2000 and 1500 µL L −1 , respectively. In the in vivo strawberry test, EuEO essential oil, when applied curatively in association with carboxymethylcellulose, inhibited the proliferation of RS mycelium, whereas it had no antifungal effect against BC [112]. On the contrary,   [118,119] tested the effectiveness of EuEO, PREO, and PPEO in vitro and in vivo against RS and CA on strawberry fruits. The PREO presented the highest antifungal activity in vitro (62.5 < MIC ≤ 125). In vivo, the EO incorporated in the CMC coating showed efficiency in disease severity reduction in strawberry fruits.
CN is the causative agent of strawberry black spots. Hosseini and coworkers [116] studied the effects of six different concentrations of garlic oil (GEO) (20,155,290,430,560, and 700 mL L −1 ) and REO (100, 420, 740, 1060, 1380, and 1700 mL L −1 ) in vitro and in vivo on strawberry fruit. They argued that GEO and REO significantly inhibited the mycelial growth and conidial germination in vitro of CN in contact and vapor assays compared with the untreated control. However, the EC50 assay indicated that GEO was more effective than REO against the pathogen [117]. The results of the in vitro test were confirmed in vivo and in greenhouse conditions; in fact, these EOs significantly reduced the anthracnose disease incidence and severity compared with untreated controls [117].
Collelotrichum gloeosporioids, but, in general, all fungi of this family, is a significant and dangerous saprophytic pathogen of sweet cherries that frequently results in postharvest losses [127]. In vitro tests with TEO, CEO, and ClEO in the contact phase demonstrated the highest inhibitory effect on CA mycelial growth at concentrations of 467 and 667 µL L −1 , respectively. TEO volatiles totally controlled the disease, whereas CEO volatiles decreased the pathogen penetration and development in strawberry fruit under disease-favorable conditions [3].
Wang and coworkers tested the efficacy of nine EOs (clove, thyme, palmarosa, lemongrass, lemon, cinnamon, and laurel leaf) in vitro in vapor and contact phases (100 and 1000 µL L −1 , respectively). Of these, CEO and ClEO showed the greatest inhibition of growth against CG. The in vivo findings demonstrated that clove oil was the most effective inhibitor against CG in artificially infected sweet cherries. Its fungitoxic activities may be attributed to the destruction of the cell wall and cell membrane, as well as the leakage of intracellular components [108].
Against AF, BC, and PE, Zhang and coworkers [107] tested a new polyvinyl alcohol/βcyclodextrin (PVA/β-CD, 6:1) nanofibers with ZBEO (10%) incorporated. Both in vitro and in vivo tests on strawberries and sweet cherries showed a significant antifungal activity of film/ZBEO, which increased the shelf-life of fruits, inhibiting the fungi growth without changing their sensory characteristics ( Figure 5) [107].
Against AF, BC, and PE, Zhang and coworkers [107] tested a new polyvinyl alc cyclodextrin (PVA/β-CD, 6:1) nanofibers with ZBEO (10%) incorporated. Both in v in vivo tests on strawberries and sweet cherries showed a significant antifungal of film/ZBEO, which increased the shelf-life of fruits, inhibiting the fungi growth changing their sensory characteristics ( Figure 5) [107]. The EOs from Acorus calamus, Allium sativum, Mucuna pruriens, and Sesamum were particularly successful in in vitro tests in preventing the development of postharvest fungi. In particular, PN was the target of GEO's strongest antifunga among the EOs tested. GEO also considerably slowed the development of other species that were applied in the test, including AN, AF, and RM. In vivo, the G significantly diminished the growth of AF and AN on plum fruit, reducing the de tion of these fruits [106].
Different papers reported antimicrobial effects of EOs on total yeast, mol mesophilic bacteria of stone fruit. The antimicrobial activity reported in this review be analyzed further. The main results of these studies are shown in Table 6.  The EOs from Acorus calamus, Allium sativum, Mucuna pruriens, and Sesamum indicum were particularly successful in in vitro tests in preventing the development of several postharvest fungi. In particular, PN was the target of GEO's strongest antifungal action among the EOs tested. GEO also considerably slowed the development of other fungal species that were applied in the test, including AN, AF, and RM. In vivo, the GEO also significantly diminished the growth of AF and AN on plum fruit, reducing the deterioration of these fruits [106].

Conclusions and Perspectives
EOs could contribute to the goal of sustainable production because, to date, the acquisition of tolerance by the studied pathogens in treated fresh products has not been demonstrated. They are considered safe for both the environment and human health, so interest in their use as antimicrobial agents for fresh produce has increased in recent years. Several research studies have been conducted to demonstrate the benefits of EOs in containing many fruit postharvest diseases. In general, EOs extracted from different plant organs have been found to be non-harmful to fresh food, human health, and the environment if the correct doses and timing are observed.
Several research studies have been conducted under in vitro conditions. Research on the use of EOs on fresh fruit has shown that the EOs concentration and their compounds, required to inhibit microbial growth, are generally higher in food than in culture media. Unfortunately, in some cases, the concentrations that are effective against the disease can be phytotoxic and cause the further chemical deterioration of treated food.
Botanicals can be applied in the form of dipping, but several studies report their use as vapors due to their advantage in preventing product contamination. Many of these EOs have already been registered as flavoring agents, so they can easily be registered for postharvest use. Despite all of the obvious advantages, much work remains to be carried out on the detailed examination of the biological activity and dispersion of EOs and their compounds in fruit tissues in order to develop a formulation that maintains antimicrobial activity without causing undesirable effects on the foods. A viable alternative to increasing the half-life of the EOs and reducing the contact between the essential oil and the food, so as to reduce the possibility of undesirable effects on the fruit, is the inclusion of the EOs in nanoparticles, coatings, or films.
The inclusion of EOs in film, coating, and/or nanoparticles represents a valid strategy for increasing the water solubility, stability, and bioavailability and decreasing the volatility of EOs. To date, there are few scientific contributions reporting the active inclusion of EOs as a treatment against postharvest pathogens in fruits of the Rosaceae family.