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Plant Pathology Journal
Year: 2008  |  Volume: 7  |  Issue: 1  |  Page No.: 75 - 84

Propagation of the CABMV from Infected Seeds in Three Zones of Burkina

B.J. Neya, J. Zabre, R.J. Millogo, S. Guinko and G. Konate    

Abstract: The effect of contamination of cowpea seeds by Cowpea aphid borne mosaic virus (CABMV) on disease development was studied in three agro-ecological zones of Burkina Faso. Seed contamination is the only source of primary infection by CABMV in the field while aphid vectors are responsible for secondary infections. Two cowpea varieties with different seed contamination rate (0, 0.05, 0.25, 0.5, 1 and 5%) were used. The infected plants were recorded every week from the tenth Day After Sowing (DAS) and over seven weeks. In the same way, populations of aphids were evaluated in plots at 30 DAS. There was a difference between the average numbers of insects from one location to another. The initial contamination rate of cowpea seeds by the CABMV played a leading important role in epidemics development according to the areas. With the variety Local Gorom, the secondary infections were early and fast in Niangoloko zone. In Sapouy area, the secondary infections were lower and belated. In the centre zone the impacts were lower than those of Sapouy. In the case of variety Kvx61-1, the secondary infections were medium for all initial contamination rates even in years of great epidemics. For each year, any difference of impact rate had not got between the different seeds upset contamination levels Kvx61-1 behaved well in the three localities even the west where aphids appear precociously and densely.

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