CBN-V Video Archives - S8-10
Response of Resistant Cassava Varieties to Cassava Mosaic Disease Under Pandemic Conditions in Western Kenya

Lwole L.¹, E.O Monda¹, G.W Otim-Nape² and M.J. Thresh³

1. Dept. of Botany, Kenyatta University PO Box 43844 Nairobi. lwole@munglukk.africaonline.com.
2. National Agricultural Research Organisation, PO Box 295 Entebbe, Uganda.
3. Natural Resources Insitute, University of Greenwich, UK.

        Experiments on the spread of Cassava Mosaic Disease (CMD), conducted in Bungoma, Kakamega and Siaya in 1999/2000, revealed considerable spread of the disease between April and October 1999 at all sites. There was little spread at Siaya between August 1999 and March 2000 and no spread at Kakamega at this period. Generally, most spread occurred at Siaya and it was significantly greater than at other sites. The spread was more at Kakamega than at Bungoma. The local variety Serere used as control, showed high incidence of the disease towards the end of the experiment for the April 1999 plantings, whereas the improved varieties TMS 30337 and TMS 30572 showed apparent decline in disease incidence. Variety SS-4 had only one plant infected at Kakamega during the same period. The number of adult whiteflies differed significantly between sites and between varieties in all experiments. Mean cassava mosaic disease severity was not significantly different between Siaya (2.1) and Kakamega (2.0) but were significantly higher (P  0.05) than that at Bungoma (1.6).

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