• KOREAN JOURNAL OF CROP SCIENCE
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• v.32 no.3
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• pp.353-356
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• 1987

To find out the effect of 2.4-D on growth response and fruit quality of strawberry, by leaf treatment (spray) of 120l/10a of 2.4-D(amine salt 40%) 10 ppm solution at flowering stage of 1st cluster, the experiment was carried out in the P-E film covered green-house. The strawberry plant showed the epinastic growing response with long petiole and petide and increased the evolution of ethylene from leaves and fruits after 2.4-D spraying. Therefore, the peak of picking time was accerated about 15 days according to the higher amount of ethylene evolution from strawberry plants, and the yield of fruit increased about 18% by improving the average weight of a fruit.

• Research in Plant Disease
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• v.25 no.2
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• pp.84-88
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• 2019

A variety of microorganisms in rhizosphere affect plant health by plant growth promotion, mitigation of abiotic stresses as well as protection from pathogen attacks. In our previous study, we selected a bacterium, Bacillus mesonae H20-5, for alleviation of salinity stress in tomato plants. In this study, we verified the effect of a liquid formulation of B. mesonae H20-5 (TP-H20-5) on fruit production and phytochemical accumulation including lycopene and polyphenol in cherry tomato and strawberry fruits in on-farm tests of protected cultivation under salinity stress. When vegetables including tomato, cherry tomato, strawberry, and cucumber were treated with TP-H20-5 by irrigated systems, final marketable yields were increased by 21.4% (cherry tomato), 9.3% (ripen tomato), 120.6% (strawberry), and 14.5% (cucumber) compared to untreated control. Moreover, treatment of TP-H20-5 was showed increase of phytochemicals such as lycopene and total polyphenol compared to untreated control in cherry tomato and strawberry. Therefore, these results indicated that a formulant of B. mesonae H20-5 can be used as a potential biofertilizer for increasing fruit production and quality.

• Korean Journal of Environmental Agriculture
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• v.42 no.4
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• pp.382-388
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• 2023

A liquid-type chlorella (LC) produced by self-cultivation is used for strawberry cultivation by farmers in Korea. This study aimed to investigate seedling growth in two strawberry cultivars 'Soraya' and 'Haruhi' after applying solid-type chlorella (SC) in the greenhouse for 30 d. The treatments were as follows: Control, LC (0.2% of 1.0 × 10⁷ cells/mL), ¼ SC (12.5 g/m²), ½ SC (25 g/m²), and SC (50 g/m²). Compared to the control, in the ½ SC treatment, dry weight of the seedlings increased at 30 days after treatment (DAT). Phosphorus content in the leaves of 'Soraya' seedlings of the SC treatment increased compared to that of the control. At 10 and 30 DAT, photosynthetic pigments including chlorophylls and carotenoids in the seedlings of both cultivars increased with the ½ SC treatment. These results indicate that the application of SC improved the growth of strawberry seedlings and could replace LC.

• The Plant Pathology Journal
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• v.20 no.2
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• pp.103-105
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• 2004

A destructive stem rot of strawberry (Fragaria x ananassa cv. Akihime) sporadically occurred in farmers' fields in Daegok-myon, Jinju city, Gyeongnam province in Korea. The infected plants showed stem and crown rot, with occasional blighting of the whole plant. White mycelia appeared on stems of infected clones and sclerotia formed on the old lesions near soil surface. The fungus formed white colony on PDA and showed maximum mycelial growth and sclerotial formation at $30^{\circ}C$. The fungus usually have many narrow hyphal strands, 2.6-10.0 $\mu\textrm{m}$ in width, in the aerial mycelium. Typical clamp connections were formed on the mycelium. Sclerotia were spherical and 1.0-2.4 mm in size. The fungus was repeatedly isolated from infected tissues and identified as Sclerotium rolfsii. Its patho-genicity was confirmed when inoculated onto straw-berry. This is the first report on the stem rot of strawberry caused by S. rolfsii in Korea.

• The Plant Pathology Journal
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• v.33 no.6
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• pp.582-588
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• 2017

The objective of this study was to determine inhibitory activities of four volatile plant essential oils (cinnamon oil, fennel oil, origanum oil and thyme oil) on in vitro growth of Fusarium oxysporum f. sp. fragariae causing Fusarium wilt of strawberry plants. Results showed that these essential oils inhibited in vitro conidial germination and mycelial growth of F. oxysporum f. sp. fragariae in a dose-dependent manner. Cinnamon oil was found to be most effective one in suppressing conidial germination while fennel oil, origanum oil and thyme oil showed moderate inhibition of conidial germination at similar levels. Cinnamon oil, origanum oil and thyme oil showed moderate antifungal activities against mycelial growth at similar levels while fennel oil had relatively lower antifungal activity against mycelial growth. Antifungal effects of these four plant essential oils in different combinations on in vitro fungal growth were also evaluated. These essential oils demonstrated synergistic antifungal activities against conidial germination and mycelial growth of F. oxysporum f. sp. fragariae in vitro. Simultaneous application of origanum oil and thyme oil enhanced their antimicrobial activities against conidial germination and fungal mycelial growth. These results underpin that volatile plant essential oils could be used in eco-friendly integrated disease management of Fusarium wilt in strawberry fields.

• Journal of Bio-Environment Control
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• v.28 no.4
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• pp.429-437
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• 2019

This study was conducted to examine the effect of humidification and shading during cutting propagation on growth and development of strawberry (Fragaria x ananassa Duch.) 'Maehyang' plants at a propagation stage. The runner cuttings were stuck on Nov. 23, 2017 in propagation benches set in a Venlo-type glasshouse. Four shading treatments, no shading (control, C), 55% shading with white lawn (W55), 55% black shading net (B55), or 100% black plastic film (B100) with either an intermittent fog system (H) or without fog system. The shading and fog systems were removed 2 weeks after sticking of strawberry cuttings. A nutrient solution for strawberry, which was developed by Yamazaki, was supplied once a day with electrical conductivity (EC) $1.6dS{\cdot}m^{-1}$ and pH 5.8. Growth parameters such as plant height, longest root, crown diameter, leaf chlorophyll, leaf area and fresh and dry weight were measured at 7 days and 26 days after sticking. There was no significant difference in growth of above-aerial part of strawberry. The overall growth of the strawberry roots was better grew by providing fog than that not provide fog. The root fresh weight and root dry weight after 26 days after sticking of strawberry cutting was the best in the treatment that provided fog system without shading (CH). The longest root after 26 days after sticking of strawberry cutting was the best in the treatments that provided fog system with either 55% white lawn (W55H) and 55% black shading net (B55H). These results suggest that morphogenesis of these plants were affected by humidification and shading types. In a broader perspective, these results can be used to optimize studies of other crops grown from cuttings.

• Korean Journal of Agricultural Science
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• v.4 no.2
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• pp.121-125
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• 1977

The activity of endogenous cytokinin-like substance in dormant plants(Fragaria ananassa) was different depending on the degree of dormancy and their activity was showed the similar trend as that of growth phase. When strawberry plant crowns were extracted in methyl alcohol, and the extract was seperated by column chromatography, it showed that the activity was observed in two places by soybean callus bioassay. Activity of cytokinin-like substance was appeared when ethyl acetate/methyl alcohol (90/10v. and 50/50v.) were used. In relation to growth phase of strawberry plants, cytokinin-like activity increased at vigorous growth periods, whereas decreased in deep dormant period. However, cytokinin-like substance activity occurred again after strawberry plants passed through a certain chilling periods. Accordingly, it showed to have a negative correlation between the degree of dormancy and a mount of endogenous cytokinin-like substance.

• The Plant Pathology Journal
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• v.21 no.1
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• pp.59-63
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• 2005

Bacillus subtilis S1-0210 was selected as a biological agent against Botrytis cinerea in strawberry. The isolate inhibited mycelial growth of B. cinerea in vitro tests. A wettable powder formulation of B. subtilis S1-0210 significantly reduced infection rates with lower than 5%, compared with higher than 70% of infection rates in untreated control. The formulation showed 85 to 89% control efficacies of gray mold incidences on fruits of strawberry in pots. Pre-treatment of the agent was more effective in controlling gray mold on fruits and leaves than post-treatment at the early stage of disease development. The formulation also showed 70% control efficacy of gray mold incidence on fruits of strawberry in a field trial. The results indicate that B. subtilis S1-0210 in the wettable powder formulation may be a potential biocontrol agent to control gray mold on strawberry.

• KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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• v.20 no.1
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• pp.17-24
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• 2014

The purpose of this study was to review the brief physiological characteristics and some factors of the quality decay of strawberry harvested in Korea. Strawberries are highly perishable with soft surface. Surface injury and fungus growth are common as a result of handling and distribution. Many growers and distributers are considered to protect the physical impact and inhibit the fungus growth for prolonging the shelf life in the distribution and market channels. Post-harvest treatments of precooling, carbon dioxide, chlorine dioxide, ozone, and ultrasound are practiced on strawberry in order to extend shelf-life and preserve the quality. Modified atmosphere packaging, edible coating, and oxygen absorbent application can be used as supplemental treatments to extend postharvest-life of strawberry. The packaging types for current domestic and export strawberry in Korea were summarized. The findings from this study can be lead to a better understanding of strawberry packaging development associated with the proper handling and distribution of strawberry. This could be useful for the strawberry growers, distributors, and buyers.

• Food Science and Preservation
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• v.11 no.1
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• pp.7-11
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• 2004

To examine the effect of storage condition on the quality and microbiological change of strawberry “Minyubong”, the rate of weight loss, decay rate, pH and titratable acidity, and microbial (total bacterial count, mold and yeast) changes were determined during storage. Strawberry fruits were packaged with low-density polyethylene (LDPE). Strawberries were then stored at 4$^{\circ}C$ and 20$^{\circ}C$, respectively. LDPE package was effective on the decrease of decay rate of strawberry as well as the rate of weight loss, compared with the non-packaged. Microbial changes of strawberry stored at 4$^{\circ}C$ and 20$^{\circ}C$ were monitored during storage. Packaging affected the microbial change, resulting in retarding the growth of total bacteria as well as mold and yeast, compared with the non-packaged, regardless of storage temperature. These results indicate that storage of strawberry fruits wrapped with LDPE at 4'C should be recommended in terms of quality as well as its shelf-life.