Fungi of post-harvest deterioration of carrot (Daucus Carota L.) and antifungal potential of essential oils of Cymbopogon Citratus and Citrus Sinensis

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Research Paper 01/06/2021
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Fungi of post-harvest deterioration of carrot (Daucus Carota L.) and antifungal potential of essential oils of Cymbopogon Citratus and Citrus Sinensis

Kelogkou Nana Giovannie Elodie, Yaouba Aoudou, Maptue Fotso Barbara, Kouam Djoko Idriss, Nyaka Ngobisa Aurélie
Int. J. Biosci.18( 6), 129-138, June 2021.
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This work focused on the study of fungi associated with post-harvest carrot degradation (Daucus Carota L.) in the Dschang markets and the evaluation of the antifungal potential of essential oils of Cymbopogon citratus and Citrus sinensis. Samples were collected from Dschang markets and associated fungi were isolated and identified. The in vivo antifungal effect of Cymbopogon citratus (40 and 120 ppm) and Citrus sinensis (600 and 800 ppm) essential oils was evaluated on carrots inoculated with three fungal species. Thirteen fungal species, including Botrytis cinerea (23%), Rhizoctonia carotae (21%), Cladosporium herbarium (18%), Verticillium albo atrum (10%) and Geotrichum candidum (11%) were isolated from the decayed samples. Botrytis cinerea, Rhizoctonia carotae, Cladosporium herbarium and Verticillium albo atrum were pathogenic on carrot roots and lesions caused varied according to the fungal species from 8.83 cm2 (R. carotae) to 5.48 cm2 (Botrytis cinereal). In vivo results showed that the essential oils used significantly reduced the development of fungi on carrots compared to the control. Lesions developed on carrots inoculated with fungi and treated at different doses of Cymbopogon citratus and Citrus sinensis essential oils ranging from 1.1 to 1.77 cm2 and 1.38 to 2.04 cm2 respectively, were significantly lower than those developed on untreated control carrots (7 to 9 cm2). C. citratus essential oil was found to be more effective than Citrus sinensis. Based on these results, the use of these essential oils can constitute a potential or suitable alternative to synthetic fungicides to fight against post-harvest fungi of carrots.


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