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First Report of Pythium Root Rot of Rau Ram (Polygonum odoratum).

E N Rosskopf1, C B Yandoc1, B Stange2

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Area of Science:

  • Plant Pathology
  • Mycology
  • Horticulture

Background:

  • Polygonum odoratum (rau ram) is a significant herb in Vietnamese cuisine, native to Southeast Asia.
  • Hydroponic cultivation of rau ram in Florida involves dense plant mats in recirculated water systems.
  • A severe dieback incident in a Florida hydroponic production house prompted an investigation into the cause.

Purpose of the Study:

  • To identify the causal agent of the observed dieback and root rot in hydroponically grown Polygonum odoratum.
  • To confirm the pathogenicity of the isolated organism on P. odoratum.
  • To report the first instance of root rot in P. odoratum caused by Pythium helicoides.

Main Methods:

  • Symptomatic P. odoratum plant tissues were plated on general and selective media.
  • Isolates were identified as Pythium helicoides based on morphological characteristics of sporangia, oogonia, and antheridia.
  • Pathogenicity tests were conducted using P. odoratum plants inoculated with P. helicoides isolates under varying temperature conditions.

Main Results:

  • Pythium helicoides was consistently isolated from symptomatic rau ram plants.
  • Inoculation tests confirmed P. helicoides caused chlorosis and root necrosis in P. odoratum.
  • Symptoms appeared more rapidly at higher temperatures (35–40°C) compared to greenhouse conditions (20–30°C).

Conclusions:

  • Pythium helicoides is identified as the pathogen responsible for root rot in hydroponically grown Polygonum odoratum.
  • This research provides the first documented evidence of P. odoratum root rot caused by P. helicoides.
  • Findings are critical for developing management strategies to prevent crop losses in rau ram hydroponic systems.