• Title/Summary/Keyword: Horticultural

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Identification of Fusarium Basal Rot Pathogens of Onion and Evaluation of Fungicides against the Pathogens

  • Jong-Hwan Shin;Ha-Kyoung Lee;Chang-Gi Back;Soo-hyun Kang;Ji-won Han;Seong-Chan Lee;You-Kyoung Han
    • Mycobiology
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    • v.51 no.4
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    • pp.264-272
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    • 2023

  • Onion (Allium cepa L.) is an economically important vegetable crop worldwide. However, various fungal diseases, including Fusarium basal rot (FBR), neck rot, and white rot, reduce onion production or bulb storage life. FBR caused by Fusarium species is among the most destructive onion diseases. In this study, we identified Fusarium species associated with FBR in Jeolla and Gyeongsang Provinces in South Korea and evaluated fungicides against the pathogens. Our morphological and molecular analyses showed that FBR in onions is associated with Fusarium commune, Fusarium oxysporum, and Fusarium proliferatum. We selected seven fungicides (fludioxonil, hexaconazole, mandestrobin, penthiopyrad, prochloraz-manganese, pydiflumetofen, and tebuconazole) and evaluated their inhibitory effects on mycelial growth of the pathogens at three different concentrations (0.01, 0.1, and 1 mg/mL). We found that prochloraz-manganese was highly effective, inhibiting 100% of the mycelial growth of the pathogens at all concentrations, followed by tebuconazole. Fludioxonil showed < 50% inhibition at 1 mg/mL for the tested isolates.

  • https://doi.org/10.1080/12298093.2023.2243759 인용 PDF

Characterization of a Novel Cucumber mosaic virus Isolated from Petunia hybrida

  • Han, Kyung-Sook;Choi, Gug-Seoun;Chung, Bong-Nam;Cho, Jeom-Duk;Cho, In-Sook;Kim, Kee-Hong;Kim, Su;Yoon, Ju-Yeon;Choi, Seung-Kook
    • The Plant Pathology Journal
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    • v.28 no.3
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    • pp.299-305
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    • 2012

  • Petunia hybrida is commonly used in landscapes and interiors for its attractive flower. Virus-like foliar symptoms, including a mosaic with dark green islands surrounding the veins and chlorosis on the leaf margins, were observed on a petunia plant from Icheon, Gyeonggido, Korea. Cucumber mosaic virus (CMV) was identified in the symptomatic petunia by serological testing for the presence of CMV coat protein (CP) with a direct antibody-sandwich-enzyme-linked immunosorbent assay. An agent was mechanically transmitted to indicator plant species including Chenopodium quinoa. Examination of the inoculated plant leaves by RT-PCR analysis and electron microscopy revealed the presence of specifically amplified CP products and spherical virions of approximately 28 nm in diameter, respectively, providing confirmation of a CMV infection. Analysis of CP sequences showed that CMV petunia isolate (CMVYJC) shared 82.5-100% amino acid sequence identity with CPs of representative CMV strains. Phylogenetic analysis of CPs supports that CMV-YJC is a member of CMV subgroup IA (CMV-IA) and has biological properties of CMV-IA on host species. To our knowledge, this is the first report of CMV from P. hybrida in Korea.

  • https://doi.org/10.5423/PPJ.NT.04.2012.0050 인용 PDF KSCI

Seedling Conditions for Kimchi Cabbage, Head Lettuce, Cabbage and Broccoli for a Riding-type Transplanter

  • Lim, Jung-Hyun;Park, Suh-young;Chae, Won-Byung;Kim, Sung-Kyeom;Choi, Seung-Kook;Yang, Eun-Young;Lee, Min-Ji;Park, Gyeong-Bin;Jang, Yoon-ah;Seo, Myeong-Hoon;Jang, Suk-Woo
    • Journal of Biosystems Engineering
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    • v.42 no.2
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    • pp.104-111
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    • 2017

  • Purpose: We have studied the necessary qualities of seedlings of some leafy vegetables for a riding-type two-row automatic transplanter. When seedlings are planted using a transplanter, long roots may be rounded in the bottom of the tray, and this can interfere with the separation of the seedlings. Uprightness related to leaf spread angle is an important quality for seedlings in mechanical planting. Methods: To select cultivars suitable for the transplanter, we compared varieties of Kimchi cabbage (Chukwang, Daetong, Whipalam and Namdo), head lettuce (Abi and Sensation), cabbage (YR Onnuri, YR Hogel, Harutama, and Ogane), and broccoli (Nicegreen and Earlyyou). To compare the effect of bed soil on root formation and growth, we used five types of soil: Chologi, Burger, Wonjomix, Bio, and Baroker with 2.6-3 L per tray. Growth increment and the degree of root formation were measured according to the RDA guidelines 25 days after sowing for Kimchi cabbage and head lettuce and 44 days after sowing for cabbage and broccoli. Conclusions: According to the plug tray, the optimum seedling age in both 128- and 200-hole trays was 28 days for Kimchi cabbage and 44 days for cabbage and broccoli. Head lettuce took 35 days in 128-hole trays and 31 days in 200-hole trays. Burger soil was most effective for root formation and growth of the four kinds of leafy vegetables; it appeared that smaller soil volume led to faster root formation.

  • https://doi.org/10.5307/JBE.2017.42.2.104 인용 PDF KSCI