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Journal articles on the topic 'Pythium helicoides'

Author: Grafiati

Published: 20 February 2023

Last updated: 31 July 2025

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1

Teixeira, Liliane De Diana, Carmen Lídia Amorim Pires Zottarelli, and Hiroshi Kimati. "Efeito da temperatura no crescimento micelial e patogenicidade de Pythium spp. que ocorrem em alface hidropônica." Summa Phytopathologica 32, no. 3 (2006): 221–26. http://dx.doi.org/10.1590/s0100-54052006000300002.

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Doze isolados de Pythium foram obtidos de raízes de alface cultivada em sistemas hidropônicos comerciais, apresentando ou não sintomas de apodrecimento. Três desses isolados foram identificados como Pythium helicoides Drechsler (H1, H2 e H3), cinco como pertencentes ao grupo F (F1 a F5) e quatro ao grupo T (T1 a T4) de Pythium. A identificação das espécies foi realizada baseando-se nas características morfológicas. O efeito da temperatura (10, 15, 18, 21, 24, 27, 30, 37 e 40ºC) sobre o crescimento micelial foi determinado para todos os isolados. As temperaturas mínima e máxima, estimadas pela

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2

Choudhary, Carla E., Maria L. Burgos-Garay, Gary W. Moorman, and Chuanxue Hong. "Pythium and Phytopythium Species in Two Pennsylvania Greenhouse Irrigation Water Tanks." Plant Disease 100, no. 5 (2016): 926–32. http://dx.doi.org/10.1094/pdis-07-15-0836-re.

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Two commercial greenhouses producing potted plants in Pennsylvania using recycled irrigation water in an ebb-and-flood system have incurred significant crop losses due to Pythium aphanidermatum. In cooperation with the greenhouses, one or more of their water tanks was monitored continuously (128 tank samplings) for Pythium spp. by baiting. Nine species of Pythium and three species of Phytopythium were recovered, representing clades A, B, E, and K, but none was P. aphanidermatum. The recovered Pythium spp. were (i) P. rostratifingens, (ii) isolates identical to Pythium sp. nov. OOMYA1702-08 (cl

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3

Lee, Ha-Kyoung, Sieun Kim, Jong-Hwan Shin, Seong-Chan Lee, and You-Kyoung Han. "First Report of Root Rot Disease on Grapevine (Vitis vinifera L.) Caused by Phytopythium helicoides in Korea." Research in Plant Disease 30, no. 4 (2024): 460–63. https://doi.org/10.5423/rpd.2024.30.4.460.

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Phytopythium helicoides is a fungal pathogen belonging to the genus Phytopythium, a distinct group comprising the genera Phytophthora and Pythium. In July 2022, stem and root rot were observed on grapevine at Pocheon area. Symptoms included leaf wilting, shoot and root blight, and whitish mycelium growth on the surface of the root lesions. Samples from symptomatic tissues of the infected grapevine tree were collected and cultured on the potato dextrose agar. Morphological features and nucleotide sequences of cytochrome C oxidase subunit II and beta tubulin gene regions were analyzed. As a resu

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4

KAGEYAMA, Koji, Tomoaki AOYAGI, Rumi SUNOUCHI, and Hirokazu FUKUI. "Root Rot of Miniature Roses Caused by Pythium helicoides." Journal of General Plant Pathology 68, no. 1 (2002): 15–20. http://dx.doi.org/10.1007/pl00013047.

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5

Han, Kyung-Sook, Seung-Beom Hong, Seong-Chan Lee, You-Kyoung Han, and Dae-Ho Kim. "Root Rot of Rose Caused by Pythium helicoides in Korea." Plant Pathology Journal 26, no. 4 (2010): 429. http://dx.doi.org/10.5423/ppj.2010.26.4.429.

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6

Tkaczyk, Miłosz. "Phytopythium: origin, differences and meaning in modern plant pathology." Folia Forestalia Polonica 62, no. 3 (2020): 227–32. http://dx.doi.org/10.2478/ffp-2020-0022.

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AbstractThe genus Phytopythium is a relatively new group of organisms distinguished from the Pythium genus. These are organisms closely related to Pythium and Phytophthora, with similar structure and biology. Despite many similarities, this genus is characterised by several morphological features that allow it to be easily identified. Until now, more than 20 species belong to this genus, most of which are saprophytic organisms. However, there is also a group of species particularly dangerous to plants. These species include, among others, Pp. litorale, Pp. helicoides and Pp. vexans. The purpos

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7

Yang, X., P. A. Richardson, H. A. Olson, and C. X. Hong. "Root and Stem Rot of Begonia Caused by Phytopythium helicoides in Virginia." Plant Disease 97, no. 10 (2013): 1385. http://dx.doi.org/10.1094/pdis-05-13-0472-pdn.

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In the summer of 2011, severe root and stem rot of begonia (Begonia × semperflorens-cultorum cv. Vodka Dark Red) was observed during a field trial. Seventy-eight percent of the plants had symptoms included foliar blight, blackened and rotting roots, rotting stems, and collapsing crown, often leading to plant death. Isolation from the diseased plant roots consistently recovered a Pythium-like species and 41 isolates were subcultured for identification. These isolates produced very similar single-strand conformation polymorphism (SSCP) fingerprints (2), which were distinct from those of other oo

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8

Rosskopf, E. N., C. B. Yandoc, B. Stange, E. M. Lamb, and D. J. Mitchell. "First Report of Pythium Root Rot of Rau Ram (Polygonum odoratum)." Plant Disease 89, no. 3 (2005): 340. http://dx.doi.org/10.1094/pd-89-0340a.

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Polygonum odoratum (= Persicaria odorata), known as rau ram or sang hum, is native to southeastern Asia and is a common herb in Vietnamese cuisine (1). It has been studied most extensively for its aromatic compound content (2). In Florida, rau ram commonly is grown hydroponically in greenhouses using large, cement beds with recirculated water. The plants form dense mats from which new growth is trimmed for market. During January of 2002, a severe dieback was observed in one production house in Saint Lucie County, FL. Plants with less severe symptoms were yellowed and stunted. Roots of symptoma

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9

Yano, T., S. Shimizu, T. Miyoshi, et al. "TOLERANT ACTINIDIA SPECIES TO PYTHIUM HELICOIDES AND P. VEXANS CAUSING ROOT ROT." Acta Horticulturae, no. 913 (November 2011): 517–23. http://dx.doi.org/10.17660/actahortic.2011.913.69.

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10

Kageyama, Koji, Masako Senda, Takahiro Asano, Haruhisa Suga, and Kiyoshi Ishiguro. "Intra-isolate heterogeneity of the ITS region of rDNA in Pythium helicoides." Mycological Research 111, no. 4 (2007): 416–23. http://dx.doi.org/10.1016/j.mycres.2007.01.019.

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11

Oszako, Tomasz, Katarzyna Sikora, Lassaâd Belbahri, and Justyna A. Nowakowska. "Molecular detection of oomycetes species in water courses." Folia Forestalia Polonica 58, no. 4 (2016): 246–51. http://dx.doi.org/10.1515/ffp-2016-0028.

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Abstract In Poland, about 20% of forest nurseries use irrigation water coming from natural superficial reservoirs, presumed to be the first source of infection caused by harmful pathogens belonging to the Oomycota class, especially Phytophthora genus and Pythium genus. The forest nursery is the only place where forest managers can react before pathogens leave it with asymptomatic plants or soil attached to their roots. The aim of this research was detection and identification phytopathogens in water samples. In order to recognise genus Phytophthora or Pythium in water collected from 33 places

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12

Li, L., E. Shibata, N. Adachi, W. Yu, and H. Fukui. "RELATION BETWEEN GENEALOGY AND RESISTANCE TO ROSE ROOT ROT CAUSED BY PYTHIUM HELICOIDES." Acta Horticulturae, no. 751 (August 2007): 207–11. http://dx.doi.org/10.17660/actahortic.2007.751.24.

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13

Tomasz, Oszako, Sikora Katarzyna, Belbahri Lassaâd, and A. Nowakowska Justyna. "Molecular detection of oomycetes species in water courses." FOLIA FORESTALIA POLONICA, SERIES A – FORESTRY 58, no. 4 (2021): 246–51. https://doi.org/10.1515/ffp-2016-0028.

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In Poland, about 20% of forest nurseries use irrigation water coming from natural superficial reservoirs, presumed to be the first source of infection caused by harmful pathogens belonging to the Oomycota class, especially <em>Phytophthora</em> genus and<em> Pythium</em> genus. The forest nursery is the only place where forest managers can react before pathogens leave it with asymptomatic plants or soil attached to their roots. The aim of this research was detection and identification phytopathogens in water samples. In order to recognise genus <em>Phytophthora</em> or<em> Pythium</em> in wate

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14

Watanabe, Hideki, Tadashi Sunakawa, Hayato Horinouchi, Takanobu Kato, and Koji Kageyama. "Effect of fertilizer application on disease of rose root rot caused by Pythium helicoides." Annual Report of The Kansai Plant Protection Society 51 (2009): 49–51. http://dx.doi.org/10.4165/kapps.51.49.

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15

Chellemi, D. O., D. J. Mitchell, M. E. Kannwischer-Mitchell, P. A. Rayside, and E. N. Rosskopf. "Pythium spp. Associated with Bell Pepper Production in Florida." Plant Disease 84, no. 12 (2000): 1271–74. http://dx.doi.org/10.1094/pdis.2000.84.12.1271.

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Ten species of Pythium and a group of isolates that produced filamentous sporangia but did not form sexual structures (Pythium ‘group F’) were recovered from the root systems of fresh market bell pepper plants grown on polyethylene-mulched production systems in Florida. Pathogenicity tests using pasteurized field soil inoculated with infested wheat seed demonstrated that P. aphanidermatum, P. myriotylum, P. helicoides, and P. splendens can cause significant root rot and reductions in root growth of pepper. P. aphanidermatum and P. myriotylum caused the most severe root rot, the greatest reduct

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16

Miyazaki, Akiyoshi, Hideki Watanabe, and Koji Kageyama. "First report of root rot on begonia (Begonia×hiemalis) caused by Pythium helicoides Drechsler in Japan." Annual Report of The Kansai Plant Protection Society 51 (2009): 53–54. http://dx.doi.org/10.4165/kapps.51.53.

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17

LING, YIN, K. KAGEYAMA, T. ASANO, et al. "Detection of Pythium helicoides in flower production area using PCR with species-specific primers." Japanese Journal of Phytopathology 73, no. 2 (2007): 86–93. http://dx.doi.org/10.3186/jjphytopath.73.86.

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18

AVAN, Meltem, Gülsüm PALACIOĞLU, Tülin SARIGÜL ERTEK, et al. "Sugar beet root rot caused by oomycetous pathogens in Turkey and their control by seed treatmen." TURKISH JOURNAL OF AGRICULTURE AND FORESTRY 44, no. 6 (2020): 631–41. http://dx.doi.org/10.3906/tar-1910-55.

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The aim of this study was to determine the oomycetous pathogens causing root rot on sugar beet and test their control by seed treatment in Konya Province, Turkey. Oomycetous fungus-like pathogens of sugar beet were investigated using 866 plant samples collected at 2 growth stages, early seedling and late root, from fields in the Konya region of Turkey and 1 sample from the Thrace region. Herein, 10 oomycetous species belonging to 3 genera: Aphanomyces cochlioides, Phytophthora cryptogea, Ph. pseudocryptogea, Ph. megasperma, Ph. inundata, Pythium aphanidermatum, Py. helicoides, Py. heterothalli

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19

Miyake, Noriyuki, Hirofumi Nagai, Shinro Kato, et al. "Practical method combining loop-mediated isothermal amplification and bait trap to detect Pythium helicoides from hydroponic culture solutions." Journal of General Plant Pathology 83, no. 1 (2016): 1–6. http://dx.doi.org/10.1007/s10327-016-0691-6.

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20

Li, Lianhua, Koji Kageyama, Naoko Kinoshita, Wenjin Yu, and Hirokazu Fukui. "Development of Bioassay for Screening of Resistant Roses against Root Rot Disease Caused by Pythium helicoides Drechsler." Journal of the Japanese Society for Horticultural Science 76, no. 1 (2007): 79–84. http://dx.doi.org/10.2503/jjshs.76.79.

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21

Ishiguro, Yasushi, Takahiro Asano, Kayoko Otsubo, Haruhisa Suga, and Koji Kageyama. "Simultaneous detection by multiplex PCR of the high-temperature-growing Pythium species: P. aphanidermatum, P. helicoides and P. myriotylum." Journal of General Plant Pathology 79, no. 5 (2013): 350–58. http://dx.doi.org/10.1007/s10327-013-0466-2.

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22

Ishiguro, Yasushi, Kayoko Otsubo, Hideki Watanabe, et al. "Root and crown rot of strawberry caused by Pythium helicoides and its distribution in strawberry production areas of Japan." Journal of General Plant Pathology 80, no. 5 (2014): 423–29. http://dx.doi.org/10.1007/s10327-014-0520-8.

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23

Watanabe, Hideki, and Yoshihiro Taguchi. "Control of Pythium root rot of miniature rose using potting mixture amended with beneficial microorganisms." Annual Report of The Kansai Plant Protection Society 43 (2001): 57–58. http://dx.doi.org/10.4165/kapps1958.43.0_57.

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24

Ahonsi, Monday O., Yin Ling, and Koji Kageyama. "Development of SCAR markers and PCR assays for single or simultaneous species-specific detection of Phytophthora nicotianae and Pythium helicoides in ebb-and-flow irrigated kalanchoe." Journal of Microbiological Methods 83, no. 2 (2010): 260–65. http://dx.doi.org/10.1016/j.mimet.2010.08.019.

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25

"Pythium helicoides." CABI Compendium CABI Compendium (January 7, 2022). http://dx.doi.org/10.1079/cabicompendium.121650.

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26

Ghimire, Bhawana, and Fulya Baysal-Gurel. "A Diagnostic Guide to Phytopythium helicoides and Phytopythium vexans causing Root and Crown Rot Diseases." Plant Health Progress, June 21, 2023. http://dx.doi.org/10.1094/php-01-23-0003-dg.

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Phytopythium was initially grouped with closely related species of the Pythium group, which German botanist Nathanael Pringsheium first described in 1858. Later with the progress in studies of this group, the clade K (Ovatisporagnium) of the genus Pythium was concluded to be more closely related to the genus Phytophthora than Pythium. Ovatisporangium in the Pythium group was then replaced by the term Phytopythium. Hence, the genus Phytopythium is relatively new and is different from Pythium (Bala et al. 2010; Lodhi et al. 2020; Tkaczyk 2020). It exhibits intermediate morphological features bet

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27

Toporek, Sean M., and Anthony P. Keinath. "A Diagnostic Guide for Pythium Damping-Off and Root and Stem Rot of Cucurbits." Plant Health Progress, September 12, 2021, PHP—02–21–0042—. http://dx.doi.org/10.1094/php-02-21-0042-fi.

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All major commercially cultivated species of Cucurbitaceae are susceptible to Pythium damping-off and root and stem rot. Twenty-four species of Pythium and Phytopythium helicoides have been reported to cause disease across 10 genera. The goal of this diagnostic guide is to describe symptoms and to summarize and provide insight on techniques for isolation, storage, morphological and genetic identification, and conducting pathogenicity tests of Pythium isolates.

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28

"Morphological and molecular Characterization of Pythium s.l. species from Khyber Pakthunkhwa province, Pakistan, with some new records and description of Globisporangium ghaffarianum sp. nov." Asian journal of Mycology 6, no. 1 (2023): 86–97. http://dx.doi.org/10.5943/ajom/6/1/8.

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Pythium s.l. is an ecologically important taxon of the phylum Oomycota that lives in terrestrial and aquatic ecosystems as saprobes. Many species are facultative parasites of plants, causing losses worldwide. Thirty-six putative isolates of the genus from the District Bajaur were characterised morphologically and molecularly during the present studies. Globisporangium ghaffarianum sp. nov. is introduced as a novel taxon. Besides this, G. orthogonon, G. paroecandrum, G. selbyi, G. schmitthenneri, Pythium kashmirense, P. aristosporum, and Phytopythium helicoides are new records for Pakistan. Glo

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29

Del Castillo Múnera, Johanna, Justine Beaulieu, Neelam Redekar, et al. "Evaluating oomycete pathogen and community responses to chemical- and Slow Sand Filtration-based water treatment strategies to enable water recycling in nursery production systems." Plant Disease, January 27, 2025. https://doi.org/10.1094/pdis-12-23-2738-re.

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While recycling irrigation water can reduce water use constraints and costs in nurseries, adoption is hindered by the associated risk of recirculating and spreading waterborne pathogens. To enable regional water re-use, this study assessed oomycete re-circulation risks and recycled water treatment efficacy at organismal and community scales. In culture-based analysis of recycled pond water at two Mid-Atlantic nurseries across three years, diverse oomycetes (12+ species) were detected using culture-based analysis, with Phytopythium helicoides as the dominant species; MiSeq analysis detected eig

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30

Chen, Zhenpeng, Xiao Yang, Junxin Xue, et al. "First Report of Phytopythium helicoides Causing Crown and Root Rot on Rhododendron pulchrum in China." Plant Disease, October 2, 2020. http://dx.doi.org/10.1094/pdis-08-20-1798-pdn.

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During a 2019–2020 survey of plant pathogenic oomycetes in Nanjing, China, a cluster of five adjacent Rhododendron pulchrum plants in Xuanwuhu Park exhibited symptoms including crown and root rot and wilting. foliage blight caused due to collar and had rotting crown and root tissues resultingrot foliage blight. Diseased roots were rinsed in water, cut into 10 mm pieces, immersed in 70% ethanol for 60 sec, and plated onto clarified V8 juice agar (cV8A) containingamended with pimaricin (20 mg/liter), ampicillin (125 mg/liter), rifampicin (10 mg/liter), and pentachloronitrobenzene (20 mg/liter).

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