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First Report of Pythium intermedium Causing Root Rot on Rosa canina Rootstock in France.

R Metzger1, L Belbahri1, G Calmin1

  • 1Laboratory of Applied Genetics and Plant Health, Institute Earth Nature and Landscape, Lullier, University of Applied Sciences of Western Switzerland, 150 Route de Presinge, 1254, Jussy, Switzerland.

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|February 21, 2019
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Summary
This summary is machine-generated.

This study identifies Pythium intermedium as the cause of severe wilting and death in old rose cultivars grafted on Rosa canina rootstock in France. This marks the first documented occurrence of this pathogen on roses, highlighting a new threat to rose cultivation.

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Area of Science:

  • Plant Pathology
  • Mycology
  • Horticulture

Background:

  • Old rose cultivars grafted on Rosa canina rootstock are grown in field collections in eastern France.
  • Severe wilting and plant death were observed in these rose plants during 2005 and 2006.

Purpose of the Study:

  • To identify the causal agent of the observed rose wilting and death.
  • To confirm the pathogenicity of the isolated organism on Rosa canina rootstocks.

Main Methods:

  • Fungal isolates were obtained from necrotic rose roots and characterized morphologically.
  • DNA sequencing of the ITS rDNA region was performed for precise identification.
  • Pathogenicity tests were conducted on Rosa canina rootstocks using the isolated organism.

Main Results:

  • Morphological and ITS rDNA sequence analysis identified the pathogen as Pythium intermedium.
  • Pathogenicity tests confirmed that Pythium intermedium caused extensive root necrosis, wilting, and leaf drying in inoculated Rosa canina rootstocks.
  • The pathogen was successfully reisolated from lesions, fulfilling Koch's postulates.

Conclusions:

  • This study provides the first record of Pythium intermedium causing disease in Rosa spp. grafted on Rosa canina in France.
  • Pythium intermedium represents a newly identified threat to rose cultivation, particularly affecting older cultivars on Rosa canina rootstock.