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

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.

Bibliographic Details

Main Authors:	Zinga, Innocent, Chiroleu, Frédéric, Kamba, Emmanuel, Giraud-Carrier, Charlotte, Harimalala, Mireille Aurélie, Kosh Komba, Eprhem, Yandia, Simplice Prosper, Semballa, Silla, Reynaud, Bernard, Dintinger, Jacques, Lefeuvre, Pierre, Lett, Jean-Michel
Format:	article biblioteca
Language:	eng
Subjects:	H20 - Maladies des plantes, Manihot esculenta, traitement thermique, rendement des cultures, Bemisia tabaci, virus mosaïque manioc, http://aims.fao.org/aos/agrovoc/c_4579, http://aims.fao.org/aos/agrovoc/c_24947, http://aims.fao.org/aos/agrovoc/c_10176, http://aims.fao.org/aos/agrovoc/c_30755, http://aims.fao.org/aos/agrovoc/c_33962, http://aims.fao.org/aos/agrovoc/c_1433,
Online Access:	http://agritrop.cirad.fr/578624/ http://agritrop.cirad.fr/578624/1/Zinga4112014AJEA10275_1.pdf
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