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Plant Pathology Journal

Year: 2017 | Volume: 16 | Issue: 2 | Page No.: 62-72
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Authors

Fayza Tahiri Alaoui

Latifa Askarne

Hassan Boubaker

Hassan Boubaker

El Hassane Boudyach

Abdellah Ait Ben Aoumar

Keywords

Background and Objective: Tomato is the major fruit crop produced and exported in Morocco. This commodity is faced to many threats. The most important tomato diseases caused commercially significant losses, in Morocco and worldwide, is gray mold caused by Botrytis cinerea. This study was aimed to find out an alternative to synthetic fungicides used in the control of the polyphagous devastating fungus ‘Botrytis cinerea’ using common food additives. Materials and Methods: Thirty seven organic acids and salts considered as common food additives were tested in vitro against this pathogen using the agar dilution method. Compounds with the best antifungal activity, selected after one-way analysis of variance, were tested in vivo on artificially inoculated tomato fruit. Results: At 0.02 M, EDTA, copper sulfate and sodium metabisulfite completely inhibited the mycelial growth and sporulation of B. cinerea. The lowest Minimum Inhibitory Concentration (MIC) and Minimum Fungicidal Concentration (MFC) were recorded in sodium metabisulfite treatment. The conidia germination was inhibited by ammonium molybdate and sodium metabisulfite treatments at only 10 mM. The nine most active chemicals in the in vitro trials were tested in vivo on tomato fruit. The incidence and the severity of gray mold were significantly reduced by EDTA, potassium carbonate, sodium bicarbonate, sodium carbonate, sodium metabisulfite and sodium salicylate compared to 100% (incidence and the severity) in the control. Conclusion: The results of the current study suggest that these salts are potentially useful as postharvest GRAS compounds to control B. cinerea on tomato fruit.
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