Sweet Potato Virus Disease in Sub‐Saharan Africa: Evidence that Neglect of Seedlings in the Traditional Farming System Hinders the Development of Superior Resistant Landraces
Identifieur interne : 003691 ( Main/Exploration ); précédent : 003690; suivant : 003692Sweet Potato Virus Disease in Sub‐Saharan Africa: Evidence that Neglect of Seedlings in the Traditional Farming System Hinders the Development of Superior Resistant Landraces
Auteurs : R. W. Gibson [Royaume-Uni] ; S. C. Jeremiah [Tanzanie] ; V. Aritua [Ouganda] ; R. P. Msabaha [Tanzanie] ; I. Mpembe [Ouganda] ; J. NdunguruSource :
- Journal of Phytopathology [ 0931-1785 ] ; 2000-08.
English descriptors
- Teeft :
- Aritua, Bukoba, Cassava, Control spvd, Cultivar, Democratic republic, East africa, High incidences, Kagera district, Lake victoria, Landraces, Late yields, Mpigi, Mpigi district, Mwanga, Mwanza, Potato, Resistant landraces, Resistant varieties, Rukungiri, Rukungiri district, Seedling, Soroti, Soroti district, Spcsv, Spcsv spfmv, Spfmv, Spvd, Sweet potato, Sweet potato farmers, Sweet potato seedlings, Sweet potato virus disease, Symptomless parents, Tanzania, Traditional farming system, Uganda.
Abstract
Sweet potato virus disease (SPVD) occurs in sweet potato at all localities on the perimeter of Lake Victoria areas surveyed in Uganda and Tanzania, and was particularly common in Kagera District in Tanzania and in Rukungiri District in Uganda. All fields were planted with landraces and the most important control practices, as perceived by farmers, were the planting of cuttings derived from only symptomless parents and destroying diseased plants. Although SPVD‐resistant landraces were available, they were perceived by most farmers to have poor and late yields. Most farmers considered that their greatest need was new, more acceptable, SPVD‐resistant genotypes. Few farmers had seen either sweet potato seeds (15%) or sweet potato seedlings (11%) and, of those that had, most had ignored them. The lack of seedlings and their neglect by farmers is likely to be hindering the evolution of more acceptable, SPVD‐resistant landraces, and is probably responsible for SPVD being a long‐term disease problem.
Die Viruskrankheit der Süikartoffel (SPVD) trat in Uganda und Tansania an allen untersuchten Standorten in der Umgebung des Victoriasees auf. Besonders häufig war sie im tansanischen Kagera‐Distrikt und im ugandischen Rukungiri‐Distrikt. Alle Felder waren mit Landsorten bestellt, und die Landwirte sahen es als wichtigste Bekämpfungsmainahmen an, nur Stecklinge von symptomfreien Elternpflanzen zu setzen und erkrankte Pflanzen zu entfernen. Gegen SPVD resistente Landsorten waren zwar erhältlich, doch die meisten Landwirte gaben an, diese würden besonders schlechte und späte Erträge liefern. Die meisten Landwirte meinten, dai sie am dringlichsten neue, verbesserte SPVD‐resistente Genotypen benötigen. Nur 15% der Landwirte hatten Samen der Süikartoffel gesehen, und nur 11% Sämlinge. Die meisten dieser Landwirte hatten den Samen bzw. Sämlingen zudem keine Beachtung geschenkt. Der Mangel an Sämlingen und ihre fehlende Beachtung durch die Landwirte behindern die Entwicklung verbesserter SPVD‐resistenter Landsorten und sind damit vermutlich der Grund dafür, dai SPVD ein langfristiges Krankheitsproblem darstellt.
Url:
DOI: 10.1046/j.1439-0434.2000.00529.x
Affiliations:
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All fields were planted with landraces and the most important control practices, as perceived by farmers, were the planting of cuttings derived from only symptomless parents and destroying diseased plants. Although SPVD‐resistant landraces were available, they were perceived by most farmers to have poor and late yields. Most farmers considered that their greatest need was new, more acceptable, SPVD‐resistant genotypes. Few farmers had seen either sweet potato seeds (15%) or sweet potato seedlings (11%) and, of those that had, most had ignored them. The lack of seedlings and their neglect by farmers is likely to be hindering the evolution of more acceptable, SPVD‐resistant landraces, and is probably responsible for SPVD being a long‐term disease problem.</div><div type="abstract" xml:lang="de">Die Viruskrankheit der Süikartoffel (SPVD) trat in Uganda und Tansania an allen untersuchten Standorten in der Umgebung des Victoriasees auf. Besonders häufig war sie im tansanischen Kagera‐Distrikt und im ugandischen Rukungiri‐Distrikt. Alle Felder waren mit Landsorten bestellt, und die Landwirte sahen es als wichtigste Bekämpfungsmainahmen an, nur Stecklinge von symptomfreien Elternpflanzen zu setzen und erkrankte Pflanzen zu entfernen. Gegen SPVD resistente Landsorten waren zwar erhältlich, doch die meisten Landwirte gaben an, diese würden besonders schlechte und späte Erträge liefern. Die meisten Landwirte meinten, dai sie am dringlichsten neue, verbesserte SPVD‐resistente Genotypen benötigen. Nur 15% der Landwirte hatten Samen der Süikartoffel gesehen, und nur 11% Sämlinge. Die meisten dieser Landwirte hatten den Samen bzw. Sämlingen zudem keine Beachtung geschenkt. Der Mangel an Sämlingen und ihre fehlende Beachtung durch die Landwirte behindern die Entwicklung verbesserter SPVD‐resistenter Landsorten und sind damit vermutlich der Grund dafür, dai SPVD ein langfristiges Krankheitsproblem darstellt.</div></front></TEI><affiliations><list><country><li>Ouganda</li><li>Royaume-Uni</li><li>Tanzanie</li></country></list><tree><noCountry><name sortKey="Ndunguru, J" sort="Ndunguru, J" uniqKey="Ndunguru J" first="J." last="Ndunguru">J. Ndunguru</name></noCountry><country name="Royaume-Uni"><noRegion><name sortKey="Gibson, R W" sort="Gibson, R W" uniqKey="Gibson R" first="R. W." last="Gibson">R. W. Gibson</name></noRegion></country><country name="Tanzanie"><noRegion><name sortKey="Jeremiah, S C" sort="Jeremiah, S C" uniqKey="Jeremiah S" first="S. C." last="Jeremiah">S. C. Jeremiah</name></noRegion><name sortKey="Msabaha, R P" sort="Msabaha, R P" uniqKey="Msabaha R" first="R. P." last="Msabaha">R. P. Msabaha</name></country><country name="Ouganda"><noRegion><name sortKey="Aritua, V" sort="Aritua, V" uniqKey="Aritua V" first="V." last="Aritua">V. Aritua</name></noRegion><name sortKey="Mpembe, I" sort="Mpembe, I" uniqKey="Mpembe I" first="I." last="Mpembe">I. Mpembe</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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