Field evaluation of root rot disease and relationship between disease severity and yield in cassava
eports of cassava root rot disease from different African countries have increased in recent times. Field studies were conducted from July 1998 to October 1999 to determine a reproducible disease assessment method that would allow the comparison of results from different locations and an evaluation...
| Autores principales: | , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Cambridge University Press
2005
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| Acceso en línea: | https://hdl.handle.net/10568/103515 |
| _version_ | 1855519813822054400 |
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| author | Onyeka, T.J. Dixon, Alfred G.O. Ekpo, E.J.A. |
| author_browse | Dixon, Alfred G.O. Ekpo, E.J.A. Onyeka, T.J. |
| author_facet | Onyeka, T.J. Dixon, Alfred G.O. Ekpo, E.J.A. |
| author_sort | Onyeka, T.J. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | eports of cassava root rot disease from different African countries have increased in recent times. Field studies were conducted from July 1998 to October 1999 to determine a reproducible disease assessment method that would allow the comparison of results from different locations and an evaluation of the relationship between disease severity and root yield. Single point disease assessments at 6, 9, 12 and 15 months after planting (MAP) were compared to multiple points assessment based on the area under a disease progress curve (AUDPC). Single point assessments at 12 and 15 MAP, and the AUDPC identified continuous variation (p≤0.01) among the genotypes. However, a consistent result across trials was obtained only with the assessment based on AUDPC. Root dry yield (DYLD) at 15 MAP showed a strong negative correlation with AUDPC (r=−0.74). Regression analysis also confirmed the negative relationship between yield and root rot severity. The five genotypes compared were separated into resistant (91/02324, 30572 and 92/0427) and susceptible (92/0057 and TME-1) groups. It was concluded that root rot disease may cause significant yield loss; however, the magnitude of the yield loss will depend on the susceptibility of the cassava genotype. |
| format | Journal Article |
| id | CGSpace103515 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2005 |
| publishDateRange | 2005 |
| publishDateSort | 2005 |
| publisher | Cambridge University Press |
| publisherStr | Cambridge University Press |
| record_format | dspace |
| spelling | CGSpace1035152025-11-11T10:09:24Z Field evaluation of root rot disease and relationship between disease severity and yield in cassava Onyeka, T.J. Dixon, Alfred G.O. Ekpo, E.J.A. cassava root rots food security diseases nigeria west africa yield losses eports of cassava root rot disease from different African countries have increased in recent times. Field studies were conducted from July 1998 to October 1999 to determine a reproducible disease assessment method that would allow the comparison of results from different locations and an evaluation of the relationship between disease severity and root yield. Single point disease assessments at 6, 9, 12 and 15 months after planting (MAP) were compared to multiple points assessment based on the area under a disease progress curve (AUDPC). Single point assessments at 12 and 15 MAP, and the AUDPC identified continuous variation (p≤0.01) among the genotypes. However, a consistent result across trials was obtained only with the assessment based on AUDPC. Root dry yield (DYLD) at 15 MAP showed a strong negative correlation with AUDPC (r=−0.74). Regression analysis also confirmed the negative relationship between yield and root rot severity. The five genotypes compared were separated into resistant (91/02324, 30572 and 92/0427) and susceptible (92/0057 and TME-1) groups. It was concluded that root rot disease may cause significant yield loss; however, the magnitude of the yield loss will depend on the susceptibility of the cassava genotype. 2005-07 2019-09-06T07:54:52Z 2019-09-06T07:54:52Z Journal Article https://hdl.handle.net/10568/103515 en Open Access application/pdf Cambridge University Press Onyeka, T.J., Dixon, A.G.O. & Ekpo, E.J.A. (2005). Field evaluation of root rot disease and relationship between disease severity and yield in cassava. Experimental Agriculture, 41(3), 357-363. |
| spellingShingle | cassava root rots food security diseases nigeria west africa yield losses Onyeka, T.J. Dixon, Alfred G.O. Ekpo, E.J.A. Field evaluation of root rot disease and relationship between disease severity and yield in cassava |
| title | Field evaluation of root rot disease and relationship between disease severity and yield in cassava |
| title_full | Field evaluation of root rot disease and relationship between disease severity and yield in cassava |
| title_fullStr | Field evaluation of root rot disease and relationship between disease severity and yield in cassava |
| title_full_unstemmed | Field evaluation of root rot disease and relationship between disease severity and yield in cassava |
| title_short | Field evaluation of root rot disease and relationship between disease severity and yield in cassava |
| title_sort | field evaluation of root rot disease and relationship between disease severity and yield in cassava |
| topic | cassava root rots food security diseases nigeria west africa yield losses |
| url | https://hdl.handle.net/10568/103515 |
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