Analysis of interactions between cassava brown streak disease symptom types facilitates the determination of varietal responses and yield losses
Cassava brown streak disease (CBSD), caused by cassava brown streak viruses, is recognized as one of the most important plant disease threats to African food security. This study describes the incidence and severity of the different symptom types caused by CBSD, derived from extensive surveys in the...
| Autores principales: | , , , , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Scientific Societies
2016
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/77117 |
| _version_ | 1855536052290191360 |
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| author | Ndyetabula, I.L. Merumba, S.M. Jeremiah, S.C. Kasele, S. Mkamilo, G.S. Kagimbo, F.M. Legg, James P. |
| author_browse | Jeremiah, S.C. Kagimbo, F.M. Kasele, S. Legg, James P. Merumba, S.M. Mkamilo, G.S. Ndyetabula, I.L. |
| author_facet | Ndyetabula, I.L. Merumba, S.M. Jeremiah, S.C. Kasele, S. Mkamilo, G.S. Kagimbo, F.M. Legg, James P. |
| author_sort | Ndyetabula, I.L. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Cassava brown streak disease (CBSD), caused by cassava brown streak viruses, is recognized as one of the most important plant disease threats to African food security. This study describes the incidence and severity of the different symptom types caused by CBSD, derived from extensive surveys in the country most severely affected by the disease: Tanzania. Total plant incidence and mean root severity of CBSD, recorded from 341 farmers’ fields, were both greater in the Coast Zone (49.5% and 3.05), than in the Lake Zone (32.7% and 2.57). Overall, the differing incidences recorded declined in the following order: total plant incidence (39.1%), plant shoot incidence (33.4%), plant root incidence (19.3%), root incidence (10.5%), and unusable root incidence (5.4%). The much lower-than-anticipated loss due to the root necrosis that is characteristic of CBSD was offset by large reductions of root number in plants expressing foliar symptoms of CBSD (15.7% in the Coast Zone and 5.5% in the Lake Zone). These data suggest that the effects of CBSD on the growth of affected plants are greater than those due to root spoilage. Based on these two factors, annual losses due to CBSD in the parts of Tanzania surveyed were estimated at >860,000 t, equivalent to more than U.S.$51 million. A novel approach to using farm-derived data on the responses of the most frequently cultivated varieties to CBSD infection allowed the grouping of the varieties into four categories, based on their relative resistance or tolerance to infection. This tool should be of value to breeders in identifying and selecting for sources of resistance or tolerance in both local and exotic germplasm, and should ultimately contribute to enhancing the management of one of Africa’s most damaging crop diseases. |
| format | Journal Article |
| id | CGSpace77117 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Scientific Societies |
| publisherStr | Scientific Societies |
| record_format | dspace |
| spelling | CGSpace771172024-04-25T06:01:33Z Analysis of interactions between cassava brown streak disease symptom types facilitates the determination of varietal responses and yield losses Ndyetabula, I.L. Merumba, S.M. Jeremiah, S.C. Kasele, S. Mkamilo, G.S. Kagimbo, F.M. Legg, James P. african cassava mosaic virus crop losses disease resistance necrosis disease tolerance Cassava brown streak disease (CBSD), caused by cassava brown streak viruses, is recognized as one of the most important plant disease threats to African food security. This study describes the incidence and severity of the different symptom types caused by CBSD, derived from extensive surveys in the country most severely affected by the disease: Tanzania. Total plant incidence and mean root severity of CBSD, recorded from 341 farmers’ fields, were both greater in the Coast Zone (49.5% and 3.05), than in the Lake Zone (32.7% and 2.57). Overall, the differing incidences recorded declined in the following order: total plant incidence (39.1%), plant shoot incidence (33.4%), plant root incidence (19.3%), root incidence (10.5%), and unusable root incidence (5.4%). The much lower-than-anticipated loss due to the root necrosis that is characteristic of CBSD was offset by large reductions of root number in plants expressing foliar symptoms of CBSD (15.7% in the Coast Zone and 5.5% in the Lake Zone). These data suggest that the effects of CBSD on the growth of affected plants are greater than those due to root spoilage. Based on these two factors, annual losses due to CBSD in the parts of Tanzania surveyed were estimated at >860,000 t, equivalent to more than U.S.$51 million. A novel approach to using farm-derived data on the responses of the most frequently cultivated varieties to CBSD infection allowed the grouping of the varieties into four categories, based on their relative resistance or tolerance to infection. This tool should be of value to breeders in identifying and selecting for sources of resistance or tolerance in both local and exotic germplasm, and should ultimately contribute to enhancing the management of one of Africa’s most damaging crop diseases. 2016-07 2016-09-21T12:32:09Z 2016-09-21T12:32:09Z Journal Article https://hdl.handle.net/10568/77117 en Open Access Scientific Societies Ndyetabula, I.L., Merumba, S.M., Jeremiah, S.C., Kasele, S., Mkamilo, G.S., Kagimbo, F.M. & Legg, J. (2016). Analysis of interactions between cassava brown streak disease symptom types facilitates the determination of varietal responses and yield losses. Plant Disease, 100(7), 1388-1396. |
| spellingShingle | african cassava mosaic virus crop losses disease resistance necrosis disease tolerance Ndyetabula, I.L. Merumba, S.M. Jeremiah, S.C. Kasele, S. Mkamilo, G.S. Kagimbo, F.M. Legg, James P. Analysis of interactions between cassava brown streak disease symptom types facilitates the determination of varietal responses and yield losses |
| title | Analysis of interactions between cassava brown streak disease symptom types facilitates the determination of varietal responses and yield losses |
| title_full | Analysis of interactions between cassava brown streak disease symptom types facilitates the determination of varietal responses and yield losses |
| title_fullStr | Analysis of interactions between cassava brown streak disease symptom types facilitates the determination of varietal responses and yield losses |
| title_full_unstemmed | Analysis of interactions between cassava brown streak disease symptom types facilitates the determination of varietal responses and yield losses |
| title_short | Analysis of interactions between cassava brown streak disease symptom types facilitates the determination of varietal responses and yield losses |
| title_sort | analysis of interactions between cassava brown streak disease symptom types facilitates the determination of varietal responses and yield losses |
| topic | african cassava mosaic virus crop losses disease resistance necrosis disease tolerance |
| url | https://hdl.handle.net/10568/77117 |
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