Field evaluation of the effectiveness of thermotherapy against cassava mosaic disease in Central African Republic

Abstract : Aim: The effectiveness of thermotherapy in managing cassava mosaic disease (CMD) was studied on a susceptible local cultivar in the field in the epidemiological conditions. Study Design: The field was laid out in randomized complete block design Place and Duration: Field experiment was conducted in forest zone at Kapou located in south west of Central African Republic according to University of Bangui during August 2010 and July 2011. Methodology: Diseased cassava cuttings were treated in a heated water bath at temperatures ranging from 43ºC to 51ºC for 30 min before being grown for 12 months in the field. Results: Temperatures from 43ºC to 49ºC were found to have no deleterious effect on either the survival of cuttings or on plant regeneration. One month after planting (MAP), up to 40% of the cuttings treated at 47ºC to 49ºC had regenerated a plant with no CMD symptoms compared to 7% of untreated cuttings. Between two and five MAP, cassava cuttings treated at 49ºC produced plants with a significantly lower incidence of CMD than plants produced from untreated cuttings. All plants grown from treated cuttings developed significantly less severe CMD symptoms than untreated cuttings between 8 and 12 months after planting. The highest tuberous root yield was obtained with diseased cuttings treated at 49ºC (4.7kg/plant), equivalent to the yield from untreated symptomless cuttings (4.6kg/plant). Conclusion: Our data clearly demonstrate the value of thermotherapy to maintain a high level of production using local cultivars under severe CMD epidemic conditions.(Résumé d'auteur)
Type de document :
Article dans une revue
American Journal of Experimental Agriculture, 2014, 4 (11), pp.1232--1242
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http://hal.univ-reunion.fr/hal-01456732
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Soumis le : dimanche 5 février 2017 - 20:25:02
Dernière modification le : vendredi 14 septembre 2018 - 08:15:31

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Innocent Zinga, Frédéric Chiroleu, Emmanuel Kamba, Charlotte Giraud-Carrier, Mireille Aurélie Harimalala, et al.. Field evaluation of the effectiveness of thermotherapy against cassava mosaic disease in Central African Republic. American Journal of Experimental Agriculture, 2014, 4 (11), pp.1232--1242. 〈hal-01456732〉

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