Brown spot disease of yam tubers (Dioscorea spp.): Diagnosis and control method
Journal Title: International Journal of Farming and Allied Sciences - Year 2018, Vol 7, Issue 5
Abstract
Tubers of some varieties of Bètè-bètè and Sao (Dioscorea alata) are damaged by circular brown spots called Internal Brown Spot Disease or IBSD. IBSD depreciates the market value and organoleptic characteristics of tubers. One or several viruses have been associated with these spots. The etiology of this disease is not known. Given the enormous losses caused by this virus, it is necessary to identify the virus or viruses responsible for this disease in Côte d'Ivoire in order to propose appropriate control methods. To this end, diagnostic surveys, evaluation of epidemiological parameters and molecular analyzes were performed on symptomatic or asymptomatic leaf and tuber samples collected in Toumodi and Bouaké areas. The effectiveness of some control methods has also been determined. The diagnostic survey revealed an incidence of 80 % for IBSD in both production areas with a severity 4 (scale of 1 to 5).There is no close relationship between the presence of foliar symptoms of viruses and that of brown spots in tubers. In addition, for plants with symptoms of viral diseases, the severity of leaf symptoms changes with that of brown spots. Molecular analysis of tubercles with brown spots revealed the presence of bacilliform bands resembling those of Badnaviruses. However, the implication of this virus as agent responsible for the disease has not yet been proved. Thermotherapy, carbofuran and callicuivre have reduced the severity of IBSD. Thermotherapy (soaking seeds for 15 min in water at 50 ° C) reduces the severity of symptoms and gives satisfactory results.
Authors and Affiliations
K. Séka, K. P. Assiri, K. E. Kwadjo, F. K. Yao, H. Atta Diallo
Keywords
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