• Title/Summary/Keyword: Strawberry

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Effect of Chemical Treatment on the Control of Strawberry Anthracnose caused by Colletotrichum sp. (딸기탄저병의 약제방제효과)

  • 김승한;최성용;임양숙;윤재탁;최부술
    • Research in Plant Disease
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    • v.8 no.1
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    • pp.50-54
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    • 2002
  • A total of 55 Colletotrichum isolates from strawberry plants with anthracnose symptoms(crown rot) were inhibited in mycelial growth on potato-dextrose agar(PDA) amended with fungicides in variable degrees depending on the chemicals used, especially showing no growth on PDA with 1 mg/m/tricyclazole. However, in the detached leaf test by treating chemicals before or after inoculation of Colletotrichum sp., tricyclazole was little effective in controlling symptom development; instead azoxystrobin, which had low in vitro inhibition of mycelial growth, inhibited strongly the symptom development. Some chemicals were tested for the control of strawberry crown rot in greenhouse using three methods, sprays soil drenching and plant dipping. No or little control effect were made by chemical spray and soil drenching, but plant dipping in chemical solution, especially azoxystrobin: reduced crown rot development by about 50% in the greenhouse suggesting that the azoxystrobin treatment may be an effective control method of the crown rot of strawberry. No differences in the control efficacy were noted according to the dipping time and chemical concentration of azoxystrobin not less than 10 min and 250 mg/m/, respectively.

Exploring Environmental Factors Affecting Strawberry Yield Using Pattern Recognition Techniques

  • Cho, Wanhyun;Park, Yuha;Na, Myung Hwan;Choi, Don-Woo
    • Journal of Internet Computing and Services
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    • v.20 no.1
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    • pp.39-46
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    • 2019
  • This paper investigates the importance of various environmental factors that have a strong influence on strawberry yields grown in greenhouse using the pattern recognition methods. The environmental factors influencing the production of strawberries were six factors such as average inside temperature, average inside humidity, average $CO_2$ level, average soil temperature, cumulative solar radiation, and average illumination. The results of analyzing the observed data using Dynamic Time Warping (DTW) showed that the most significant factor influencing the strawberry production was average soil temperature, average inside humidity, and cumulative solar radiation. Second, the results of analyzing the observed data using Multidimensional Scaling (MDS) showed that the most influential factors on the strawberry yields, such as average $CO_2$ level, average inside humidity, and average illumination were differently given for each farms. However, these results are based on the distance in 3D space and can be deduced from the fact that there is not a large difference between these distances. Therefore, in order to increase the harvest of strawberries cultivated in the farms, it is necessary to manage the environmental factors such as thoroughly controlling the humidity and maintaining the concentration of $CO_2$ constantly by ventilation of the greenhouse.

Monitoring of Benzimidazole Resistance in Botrytis cinerea Isolates from Strawberry in Korea and Development of Detection Method for Benzimidazole Resistance

  • Geonwoo Kim;Doeun Son;Sungyu Choi;Haifeng Liu;Youngju Nam;Hyunkyu Sang
    • The Plant Pathology Journal
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    • v.39 no.6
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    • pp.614-624
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    • 2023
  • Botrytis cinerea is a major fungal plant pathogen that causes gray mold disease in strawberries, leading to a decrease in strawberry yield. While benzimidazole is widely used as a fungicide for controlling this disease, the increasing prevalence of resistant populations to this fungicide undermines its effectiveness. To investigate benzimidazole resistant B. cinerea in South Korea, 78 strains were isolated from strawberries grown in 78 different farms in 2022, and their EC50 values for benzimidazole were examined. As a result, 64 strains exhibited resistance to benzimidazole, and experimental tests using detached strawberry leaves and the plants in a greenhouse confirmed the reduced efficacy of benzimidazole to control these strains. The benzimidazole resistant strains identified in this study possessed two types of mutations, E198A or E198V, in the TUB2 gene. To detect these mutations, TaqMan probes were designed, enabling rapid identification of benzimidazole resistant B. cinerea in strawberry and tomato farms. This study utilizes TaqMan real-time polymerase chain reaction analysis to swiftly identify benzimidazole resistant B. cinerea, thereby offering the possibility of effective disease management by identifying optimum locations and time of application.

Ditylenchus acris (Thorne, 1941) Fortuner and Maggenti 1987, A New Strawberry Nematode in Korea

  • Kim, Dong-Geun;Kim, Seung-Han;Lee, Joong-Hwan
    • The Plant Pathology Journal
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    • v.21 no.1
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    • pp.83-85
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    • 2005
  • Ditylenchus acris was isolated from diseased strawberry plants. Frequently, D. acris and Aphelenchoides fragariae occur together in a strawberry plant. Both species appeared very similar in the shape, length, swimming behavior and causing symptoms, and difficult to distinguish them by a stereomicroscope. But they were easily distinguished under a compound microscope especially by their tail shape, median bulb, vulva position, and bursa.

Isolation of a cDNA Encoding a Chloroplast Triosephosphate Isomerase from Strawberry

  • Kim, In-Jung;Lee, Byung-Hyun;Jinki Jo;Chung, Won-Il
    • Journal of Plant Biotechnology
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    • v.2 no.3
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    • pp.115-121
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    • 2000
  • A cDNA clone encoding chloroplast triosephosphate isomerase (TPI-cp) was isolated from strawberry fruit cDNA library. Sequence analyses indicated that the cDNA contains an open reading frame of 314 amino acids (33.5 kDa) composed of a transit peptide (59 amino acids) in amino terminal region and mature protein (255 amino acids). The existence of transit peptide in the deduced amino acid sequence implies that it encodes a chloroplast isoform. The protein sequence is more similar to other plant chloroplast isoforms than cytosolic isoforms. RNA blot analysis indicated that its expression is ubiquitous in examined five tissues, flowers, leaves, petioles, roots and fruits, and shows differential pattern according to fruit ripening. Genomic DNA blot analysis showed that TPI-cp is encoded by multiple genes in strawberry. Through sequence comparison and phylogenetic tree construction, TPI-cp is distinctively grouped into dicot and chloroplast isoforms.

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Identification of Luteovirus Nucleotide Sequences in Mild Yellow-Edge Diseased Strawberry Plants

  • Shaban Montasser, Magdy;Al-Awadhi, Husain;Hadidi, Ahmed
    • The Plant Pathology Journal
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    • v.18 no.1
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    • pp.1-5
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    • 2002
  • The availability of nucleotide sequences of the coat protein gene of Potato leafroll virus (PLRV) permitted the construction of DNA primers that were utilized for cDNA synthesis. Polymerase chain reaction (PCR) products of a 487 bp. and approximately 500 bp DNA fragments were amplified from nucleic acid extracts of PLRV-infected tissue and strawberry mild yellow-edge (SMYE) diseased strawberry tissue, respectively. The amplified DNA fragments were further differentiated by hybridization analysis with a CDNA probe for the coat protein gene of PLRV and restriction fragment length polymorphism (RFLP) analysis. These results suggest that a luteovirus is associated with the SMYE disease.

A Bayesian Stochastic Frontier Estimation of Efficiencies for Strawberry and Tomato Farming : Effect of Environmentally Friendly Farming (베이지언 확률프론티어 기법을 이용한 딸기 및 토마토 친환경재배의 효율성 분석)

  • Park, Ho-Jeong;Yang, Seung-Ryong
    • Korean Journal of Organic Agriculture
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    • v.24 no.3
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    • pp.355-368
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    • 2016
  • There are growing interests in environmental friendly cultivation for the matter of health concern. This study analyzes an economic efficiency of strawberry and tomato farming by considering the role of environmentally friendly cultivation. The Database of Rural Development Administration is used for strawberry and tomato farming households. We adopt a Bayesian stochastic frontier model to resolve a small sample property of the data. Empirical finding is that environmentally friendly cultivation improves the revenue of farming but the effect on net profit is not conclusive which calls for future research.

Drying Characteristics of Strawberry Fruit Leather

  • Lee, Gwi-Hyun
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • v.10 no.2
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    • pp.137-145
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    • 2005
  • The effects of air temperature and sample thickness on drying kinetics of strawberry leather were investigated. The mathematical modeling was performed by using three thin-layer dying models. The independent variables were sample thickness (S1 = 1.8, S2 = 2.7, and S3 = 3.6mm) and air temperature (50, 60, 70, and 80$^{\circ}$C). All samples took place in the falling rate period. The values of effective moisture diffusivity, D$_{eff}$ varied from 2.40 to 12.1$^{\times}$10-9m$^{2}$/s depending on drying conditions. The values of activation energy, E$_{a}$ were 35.57, 33.14, and 30.46 KJ/mol for each sample of S1, S2, and S3. The two-term exponential model was found to satisfactorily describe the thin-layer drying kinetics of strawberry leather.

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Occurrence of Tan-brown Leaf Spot Caused by Pilidium concavum on Fragaria ananassa in Korea

  • Park, Mi-Jeong;Back, Chang-Gi;Park, Jong-Han;Han, Kyung-Sook
    • The Korean Journal of Mycology
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    • v.45 no.4
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    • pp.377-380
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    • 2017
  • In 2015, a new leaf spot disease was observed on strawberry seedlings in Wanju, Korea. Tanned brown spots appeared on the leaves of the infected plants, and often coalesced to form larger necrotic areas, resulting in the death of foliage. An isolate was obtained in pure culture. On the basis of morphological characteristics and molecular analysis of internal transcribed spacer rDNA sequence, the causal agent was identified as Pilidium concavum. Pathogenicity tests revealed the isolate was pathogenic to the leaves and fruits of strawberry. To the best of our knowledge, this is the first report of P. concavum causing tan-brown leaf spot on strawberry in Korea.