Pythium rot of Chinese cabbage (Brassica rapa L. subsp. pekinensis) caused by Pythium aphanidermatum

Tojo, Motoaki; Shigematsu, Tatsurou; Morita, Hisataka; Li, Yingjie; Matsumoto, Tadashi; Ohki, Satoshi T.

doi:10.1007/s10327-005-0218-z

Cited by 6 publications

(2 citation statements)

References 3 publications

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“…P2 isolate was found to be the most virulent and able to decrease plant weight and height by 66.44% and 22.72% respectively, as compared to the uninoculated control. These findings are also in agreement with previous studies reporting the pathogenicity of P. ultimum on pepper (Ramamoorthy et al, 2002) as well as on different crops like bean (Rossman et al, 2017), tomato (Rafin and Tirilly, 1995), pea (Naseby, Way, et al, 2001), cabbage (Tojo et al, 2005), Broccoli (El-Mohamedy, 2012), and sorghum (Idris et al, 2008). The rapid germination of Pythium sporangia exposed to root exudates or volatiles from seeds (Osburn, 1989) and its direct infection, makes very difficult pathogen control (Whipps and Lumsden, 1991).…”

Section: Discussionsupporting

confidence: 91%

Biocontrol of Pythium Damping-Off on Pepper (Capsicum Annuum) with Selected Fungal and Rhizobacterial Agents

Mannai

Jabnoun‐Khiareddine

Nasraoui

et al. 2020

Int. J. Phytopathol.

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Pythium ultimum is a common soilborne pathogen causing serious losses of pepper seedlings in nurseries and few weeks post-planting. Two pepper associated-P. ultimum isolates (P1 and P2) were shown pathogenic to pepper cv. Altar causing post-emergence damping-off with P2 isolate being the most aggressive. Fungal and bacterial antagonists have been evaluated in vitro and in vivo for their ability to suppress P. ultimum. In dual culture assay, Trichoderma harzianum, T. viride and Gliocladium virens inhibited pathogen radial growth by 18.54, 17.52 and 15.24%, respectively, relative to control, while none of the tested bacteria was shown able to significantly inhibit pathogen growth. However, drastic changes in pathogen hyphae expressed as strong lysis, the formation of mycelial cords and mycoparasitism have been observed. Pepper seeds treated with fungal antagonists’ conidial suspensions showed 60, 50 and 60% less pre-emergence damping-off infections, respectively, compared to the positive control. When tested as root dipping, only G. virens resulted in 40% reduced post-emergence damping-off. An improved seedlings fresh weight, by 79.31 and 76%, was respectively induced by G. virens-, and T. viride-based treatments while an increment of 27.58, 25.33 and 22.22 % was recorded following treatments with G. virens, T. viride and T. harzianum, relative to the positive control. The majority of tested bacterial isolates, applied as a seed treatment, had significantly improved the emergence percentage of inoculated seedlings as compared to control with Burkholderia glathei isolate 35 being the most efficient. When applied as root dipping, reduction of post-emergence damping-off ranged between 40 and 100% with Pseudomonas aureofaciens isolate 314 being the most effective agent. Seedlings treated with P. aureofaciens (314) and Bacillus pumilus (420) showed 35.38 and 28.51% higher heights, respectively. Plant weight was enhanced by 73.06, 61.18, 77.39, 61.8 and 67.93% over control following treatments with P. aureofaciens isolates 314 and 31, Bacillus pumilus 420, P. fluorescens and P. putida 227.

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Section: Discussionsupporting

confidence: 91%

Biocontrol of Pythium Damping-Off on Pepper (Capsicum Annuum) with Selected Fungal and Rhizobacterial Agents

Mannai

Jabnoun‐Khiareddine

Nasraoui

et al. 2020

Int. J. Phytopathol.

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“…They stated the first record of Pythium rot of Chinese cabbage in Egypt caused by P. ultimum. Also, the present findings are in agreement with those reported by Kikumoto (1987) and Tojo et al (2005). Pythium spp.…”

Section: Pathogenicity Testsupporting

confidence: 83%

Occurrence of Pythium Rot of Chinese Cabbage in Egypt and its Biocontrol Measures

El-Mohamedy¹,

El-Mougy²

2009

Journal of Plant Protection Research

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Abstract:In Egypt, Chinese cabbage Brassica rapa var. pekinensis is a recently introduced as a winter crop grown throughout the country along the Nile valley as well as in new reclaimed lands. Pythium rot of Chinese cabbage was detected during the cultivation season 200⁵⁄₂₀₀₆ at four governorates throughout the north side of Egypt. Isolation trails revealed that Pythium ultimum was the causal organism of disease incidence. The cultivar of Chinese cabbage Napa (green) showed higher susceptibility to infection than Michihli cv. (red). Trichoderma harzianum, T. viride, Bacillus subtilis and Pseudomonas fluorescens isolated from the rhizosphere of healthy Chinese cabbage could inhibit the in vitro growth of P. ultimum at different degrees. Under greenhouse and field trails, applying of biocontrol agents as a combination of soil mixing plus root dipping method was generally more effective than each method applied individually for suppressing Pythium rot incidence followed by soil mixing and root dipping methods. The applied bioagents could be arranged according to their activity for suppressing the disease incidence as follows: T. harzainum, B. subtilis, T. viride and P. fluorescens, respectively. The use of biocontrol agents as soil mixing and root dipping treatments could provide additional protection against crop loss due to Pythium rot disease.

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Biological characteristics and isolation of Pythium ultimum causing rot of Chinese cabbage

Zhang

2020

Australasian Plant Pathol.

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Pythium rot of Chinese cabbage (Brassica rapa L. subsp. pekinensis) caused by Pythium aphanidermatum

Cited by 6 publications

References 3 publications

Biocontrol of Pythium Damping-Off on Pepper (Capsicum Annuum) with Selected Fungal and Rhizobacterial Agents

Biocontrol of Pythium Damping-Off on Pepper (Capsicum Annuum) with Selected Fungal and Rhizobacterial Agents

Occurrence of Pythium Rot of Chinese Cabbage in Egypt and its Biocontrol Measures

Biological characteristics and isolation of Pythium ultimum causing rot of Chinese cabbage

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