First report of Pythium indigoferae and P. irregulare associated to apple trees decline in Tunisia

Mounira Souli, Naima Boughalleb, Paloma Abad-Campos, Luis Armando Á lvarez, Ana Pérez-Sierra, Josep Armengol, José García-Jiménez

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3 Scopus citations

Abstract

Pythium indigoferae and Pythium irregulare, identified based on morphological and physiological characteristics, were isolated from necrotic roots, crown tissues and the rhizosphere of apple trees in Tunisia from 23 apple orchards in spring and autumn 2007-2009. The virulence assays on excised twigs, using different Pythium species isolated demonstrated that these oomycetes were pathogenic on the Anna, Lorka and Meski varieties and the MM106 rootstock. However, the biggest lesion area was noted on MM106 rootstock. Thus, it appeared that this rootstock is more susceptible to Pythium infections than Anna, Meski and Lorka apple varieties. Furthermore, it is important to note that in vitro tests showed that P. indigoferae seems to be more virulent than P. irregulare.

Original languageEnglish
Pages (from-to)352-357
Number of pages6
JournalJournal of Phytopathology
Volume159
Issue number5
DOIs
StatePublished - May 2011

Keywords

  • Apple orchards surveys
  • Morphological characterization
  • Pathogenicity assays
  • Sequencing

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