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This study assessed the feasibility of using essential oils (EOs) against  Colletotrichum nymphaeae  inciting strawberry anthracnose. Two EOs, extracted from  Allium sativum  (garlic) and  Rosmarinus officinalis  (rosemary), were selected because their fungicide efficacy was already well characterized under laboratory and greenhouse conditions. We characterized both EOs in terms of efficacy and impact on qualitative traits and sensory quality of strawberry fruit. The gas chromatography–mass spectrometry analysis confirmed the Diallyl trisulfide (29.08%) and (α)-pinene (15.779%) as the main components of  A. sativum  and  R. officinalis  EOs, respectively. Both  A. sativum  and  R. officinalis  EOs significantly inhibited the mycelial growth and conidial germination of  C. nymphaeae  in contact and vapor assays compared with untreated control. However, EC 50  assay indicated  A. sativum  EO was more effective than  R. officinalis  EO against the pathogen. Malformations of the vegetative structures of the pathogen exposed to both EOs were revealed as shriveled, collapsed, and swelling mycelia in the cultures. Both EOs confirmed their efficacy under  in vivo  and greenhouse conditions; in fact, they significantly reduced the development of fruit decay and anthracnose disease incidence and severity, compared with untreated controls. Both EOs preserved sensory attributes and quality parameters of strawberry fruit including firmness, total soluble solids, ascorbic acid, antioxidant activity, and anthocyanin, but may leave unwanted smells. These findings suggest that two EOs can potentially represent an alternative to synthetic chemical fungicides against  C. nymphaeae  preserving fruit quality factors, although their cost and the impact on the fruit odor must be carefully taken into consideration before developing a commercial product.

frontiers in microbiology

Preharvest and Postharvest Application of Garlic and Rosemary Essential Oils for Controlling Anthracnose and Quality Assessment of Strawberry Fruit During Cold Storage