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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/5175

Title: Search for Scutellonema Bradys Resistance in Yams (Dioscorea Spp.)
Authors: Kwoseh, C.K.
Plowright, R.A.
Bridge, J.
Asiedu, R.
Keywords: Scutellonema bradys
Nematode
Dioscorea
Yam
Resistance
Issue Date: Dec-2007
Publisher: Journal of Science and Technology
Citation: Journal of Science and Technology, Vol. 27 No. 3, 2007 pp 33-42
Abstract: A study to examine variability in susceptibility of yams to Scutellonema bradys and to identify possible sources of resistance in Ghanaian yam germplasm (Dioscorca spp.) for use in yam improvement programmes, particularly, in West Africa was undertaken. Pot and field screening methodologies were used. In general, S. bradys and dry rot of tuber symptoms as well as tuber cracking increased during the storage period. The study showed a positive correlation between visual nematode damage and population densities in yam tubers. There was also a linear relationship between dry rot disease and tuber cracking at harvest and during storage. This confirms that S. bradys causes dry rot of tubers resulting in external cracking of yam tubers. Positive linear relationship was also observed between yam tuber weight loss and dry rot disease indicating that dry rot disease may have contributed to the tuber weight loss. Therefore, tuber dry rot symptoms caused by S. bradys of yams could be used to discard susceptible yams at harvest and after a period of storage. However, there was no linear relationship between nematode population densities in yam tubers and roots, therefore, a root protocol cannot be used for assessing resistance in yams as it could lead to misclassification. The yam germplasm screened, reaffirmed resistance to S. bradys in Dioscorca dumetorum var. Nkanfo and D. cayenensis var. Afun.
Description: Article published in the Journal of Science and Technology, Vol. 27 No. 3, 2007 pp 33-42
URI: http://hdl.handle.net/123456789/5175
Appears in Collections:Journal of Science and Technology 2000-

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