The ability of the antagonist yeast Pichia guilliermondii strain Z1 to suppress green mould infection in citrus fruit

  • Rachid Lahlali | lahlali.r@gmail.com Unité de Phytopathologie, Gembloux Agro-Bio Tech, Université de Liège, Gembloux, Belgium.
  • Younes Hamadi Unité de Phytopathologie, Gembloux Agro-Bio Tech, Université de Liège, Gembloux, Belgium; Laboratoire de Phytopathologie, Faculté des Sciences, Université Ibn Tofail, Kenitra, Morocco.
  • Mohammed El Guilli Institut National de la Recherche Agronomique (INRA)-El Menzeh, Laboratoire de Phytopathologie, Kenitra, Morocco.
  • M. Haissam Jijakli Unité de Phytopathologie, Gembloux Agro-Bio Tech, Université de Liège, Gembloux, Belgium.

Abstract

In previous studies it was shown that Pichia guilliermondii strain Z1, isolated from healthy Moroccan citrus Valencia-Late oranges, was effective against Penicillium italicum. Here the effectiveness of strain Z1 was assessed against Penicillium digitatum, the causal agent of green mould, under different temperature (5-25°C) and relative humidity (RH) (45-100%) regimes for its reliable and largescale application in packinghouse. All main effects and interactions were significant (P80%. Its applications as a formulated product significantly reduced the incidence of infected fruit (55%) and the percentage of infected wounds (47%) compared to the only pathogen control treatment. However, disease control with formulated product was significantly less than that obtained with thiabendazole (30%) or strain Z1 culturable cells (35%). These results highlight that strain Z1 is an effective biological control agent for control of green mould under varying environmental conditions, and control may be optimized by combining its use with other environmentally-safe post-harvest treatments or improved formulation.

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Published
2014-12-19
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Original Articles
Supporting Agencies
Direction Générale de la Coopération au Développement Belge-Commission Universitaire pour le Développement (DGCD-CUD), Plant Pathology Unit of Gembloux Agro Bio-Tech
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