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Survey of the incidence and distribution of five viruses infecting yams in the major yam producing zones in Benin
Abstract/Description
Surveys were conducted in 2004 and 2005 to determine the incidence and
distribution of viruses infecting yams in fourmajor yam-producing agro-ecological
zones in Benin. Yam leaves collected from 69 fields and one experimental
screen house were indexed for Cucumber mosaic virus (CMV), Dioscorea
mottle virus (DMoV), Yam mild mosaic virus (YMMV), Yam mosaic virus
(YMV) and yam-infecting badnaviruses [Dioscorea alata bacilliform virus
(DaBV) and Dioscorea sansibarensis bacilliform virus (DsBV)] by enzymelinked
immunosorbent assay and immunocapture polymerase chain reaction.
Eighty-two per cent and 66% of leaf samples tested in 2004 and
2005, respectively, were infected with CMV, YMMV, YMV and/or badnaviruses.
DMoV was not detected. Yam-infecting badnaviruses were the most
prevalent virus infection, detected in 45% of the total leaves sampled followed
by YMV (31%), YMMV (27%) and CMV (2%). Although the occurrence
of CMV was low, this is the first record of CMV in yams in Benin.
Mixed virus infections were detected in 48% (2004) and 39% (2005) of the
infected leaves. A mixture of YMMV and badnaviruses (DaBV or DsBV) was
the most common mixed infection detected. Dioscorea alata, with a higher
incidence of badnavirus infection (81%), YMMV (51%) and CMV (8%)
was more heavily infected than Dioscorea rotundata.
Introduction
Yams occupy a very important position as a food crop in
Benin and were ranked first among 20 most important
food and agricultural commodities of Benin in 2005
(FAO, 2005). Benin is the fourth largest producer of
yams in the world, cultivating about 195 747 hectares of
yams in 2006 (FAO, 2007). Because of the continued
and increasing dependence on yams for food in Benin,
its importance for food security and the need for improvement
in yam production, farmers in Benin are
continuously boosting
Multi standard citation
Permanent link to this item
https://hdl.handle.net/20.500.12478/2948Digital Object Identifier (DOI)
https://dx.doi.org/10.1111/j.1744-7348.2008.00253.x
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