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American Journal of Experimental Agriculture, ISSN: 2231-0606,Vol.: 4, Issue.: 11 (November)

Original-research-article

Field Evaluation of the Effectiveness of Thermotherapy against Cassava Mosaic Disease in Central African Republic

 

Innocent Zinga1,2,3*, Frédéric Chiroleu1, Emmanuel Kamba2, Charlotte Giraud-Carrier1, Mireille Harimalala1, Ephrem Kosh Komba2, Simplice Yandia2, Silla Semballa2, Bernard Reynaud1, Jacques Dintinger1, Pierre Lefeuvre1 and Jean-Michel Lett1

1CIRAD, UMR PVBMT, Plant Protection Center, 97410 Saint-Pierre, Reunion Island, France.
2Laboratory of Biological and Agricultural Sciences for Development (LBSAD), University of Bangui, BP908 Bangui, Central African Republic.
3University of Reunion, UMR PVBMT, Plant Protection Center, 97410 Saint-Pierre, Reunion Island, France.

Article Information

Editor(s):

(1) Masayuki Fujita, Department of Plant Sciences, Faculty of Agriculture, Kagawa University, Japan.

Reviewers:

(1) Djodji K. Adjata, University of Lomé, Togo.

(2) Anonymous.

Complete Peer review History: http://www.sciencedomain.org/review-history/4648

Abstracts

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.

Keywords :

Manihot esculenta; cassava mosaic disease; sanitation; thermotherapy; incidence; severity and yield; Central African Republic.

Full Article - PDF    Page 1232-1241

DOI : 10.9734/ajea/2014/10275

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