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

Zinga I., Chiroleu F., Kamba E., Giraud-Carrier C., Harimalala M.A., Kosh Komba E., Yandia S.P., Semballa S., Reynaud B., Dintinger J., Lefeuvre P., Lett J.M.. 2014. American Journal of Experimental Agriculture, 4 (11) : p. 1232-1242.

DOI: 10.9734/ajea/2014/10275

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.

Mots-clés : manihot esculenta; traitement thermique; rendement des cultures; bemisia tabaci; virus mosaïque manioc; république centrafricaine; mosaïque du manioc; african cassava mosaic virus

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