ORIGINAL ARTICLE
 
HIGHLIGHTS
  • Essential oil of Pelargonium graveolens at 250 ppm inhibited B.cinerea both in vitro and in vivo.
  • Spraying roses with essential oil could protect for five days from B. cinerea in vase-living conditions.
  • Geraniol, Citronellol, Linalool and γ-Eudesmol were the main oil constituent.
KEYWORDS
TOPICS
ABSTRACT
The main pathogen that deteriorates the quality of rose flowers during the postharvest stage belongs to the fungal genus Botrytis. The chemical products used to control the disease caused by this pathogen have been losing effectiveness due to the appearance of resistance. The present study describes the in vitro and in vivo fungicidal activity of Pelargonium graveolens essential oil and its chemical composition. The essential oil was obtained by hydrodistillation, and the in vitro fungicidal activity was determined by agar diffusion assays, showing 100% of fungal growth inhibition at 250 ppm. In vivo assays were performed on Rosa grandiflora flowers treated with 250 ppm of P. graveolens essential oil, using distillate water as a positive control and the commercial fungicide carbendazim as a negative one. No significant differences were obtained between the treatment with the essential oil and the treatment with the commercial fungicide. The chemical profile of the essential oil was determined by GC-MS. The main compounds detected were geraniol (24.89%), citronellol (19.50%), linalool (10.92%) and γ-eudesmol (8.93%). These results encourage the possible use of P. graveolens essential oil for the control of B. cinerea in rose flowers.
FUNDING
This work was supported by Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT), UNL and UNR.
RESPONSIBLE EDITOR
Andrea Toledo
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
 
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