Epidemiology and control of cowpea mosaic in Western Nigeria
Cowpea mos1aic is a serious virus disease of cowpea in the Ibadan area. Disease incidence may reach 80% at harvest. The disease also occurs in soybean, sword bean, Mexican yam bean, and lima bean. Two well-defined disease syndromes occur in cowpea: a bright yellow fleck or mosaic (YF type) and a gre...
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| Formato: | Manuscript-unpublished |
| Lenguaje: | Inglés |
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1973
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| Acceso en línea: | https://hdl.handle.net/10568/98784 |
| _version_ | 1855516962977742848 |
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| author | Glimer, R. |
| author_browse | Glimer, R. |
| author_facet | Glimer, R. |
| author_sort | Glimer, R. |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Cowpea mos1aic is a serious virus disease of cowpea in the Ibadan area. Disease incidence may reach 80% at harvest. The disease also occurs in soybean, sword bean, Mexican yam bean, and lima bean. Two well-defined disease syndromes occur in cowpea: a bright yellow fleck or mosaic (YF type) and a green mott1e with leaf distortion and puckering (GB type). GB type isolates are general1y more injurious than YF type isolates, but the two are closely related serologically to each other and to a CPMV isolate from Arkansas, USA. Economic injury to cowpea depends on three factors: virus isolate, tolerance of the infected cowpea cultivar, and most important, age of the host plant at time of infection. Early infections (7 days after emergence) reduce yields ~y 40-60% but late infections (after flowering) cause reductions of duly 5-10%. The virus is transmitted through seeds from infected plants (about 1-5%) and such infections appear to supply inoculum for secondary spread in the field. In addition to the known vector, Ootheca mutabi1is several new vectors have recently been identified: two beetles, Luperodes lineata and Nematocerus ac rbus, the grasshoppers Zonocerus variegatus and Catantops spissus, and t e thrips Sericothrips occipitalis and Taeniothrips sjostedti. The most Beasib1e means of control of the disease is the use of host immunity, present in several cowpea cultivars. Preliminary data indicate that more than one recessive gene is involved. Breeding programs will be complicated,to some extent, by differences in pathogenicity of virus isolates. |
| format | Manuscript-unpublished |
| id | CGSpace98784 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1973 |
| publishDateRange | 1973 |
| publishDateSort | 1973 |
| record_format | dspace |
| spelling | CGSpace987842023-02-15T07:20:54Z Epidemiology and control of cowpea mosaic in Western Nigeria Glimer, R. cowpeas infection breeding Cowpea mos1aic is a serious virus disease of cowpea in the Ibadan area. Disease incidence may reach 80% at harvest. The disease also occurs in soybean, sword bean, Mexican yam bean, and lima bean. Two well-defined disease syndromes occur in cowpea: a bright yellow fleck or mosaic (YF type) and a green mott1e with leaf distortion and puckering (GB type). GB type isolates are general1y more injurious than YF type isolates, but the two are closely related serologically to each other and to a CPMV isolate from Arkansas, USA. Economic injury to cowpea depends on three factors: virus isolate, tolerance of the infected cowpea cultivar, and most important, age of the host plant at time of infection. Early infections (7 days after emergence) reduce yields ~y 40-60% but late infections (after flowering) cause reductions of duly 5-10%. The virus is transmitted through seeds from infected plants (about 1-5%) and such infections appear to supply inoculum for secondary spread in the field. In addition to the known vector, Ootheca mutabi1is several new vectors have recently been identified: two beetles, Luperodes lineata and Nematocerus ac rbus, the grasshoppers Zonocerus variegatus and Catantops spissus, and t e thrips Sericothrips occipitalis and Taeniothrips sjostedti. The most Beasib1e means of control of the disease is the use of host immunity, present in several cowpea cultivars. Preliminary data indicate that more than one recessive gene is involved. Breeding programs will be complicated,to some extent, by differences in pathogenicity of virus isolates. 1973 2018-12-19T07:07:41Z 2018-12-19T07:07:41Z Manuscript-unpublished https://hdl.handle.net/10568/98784 en Open Access application/pdf Glimer, R. (1973). Epidemiology and control of cowpea mosaic in Western Nigeria: proceedings of the First IITA Grain Legume Improvement Workshop, 29 October-2 November, 1973. Ibadan, Nigeria: IITA, (1p.). |
| spellingShingle | cowpeas infection breeding Glimer, R. Epidemiology and control of cowpea mosaic in Western Nigeria |
| title | Epidemiology and control of cowpea mosaic in Western Nigeria |
| title_full | Epidemiology and control of cowpea mosaic in Western Nigeria |
| title_fullStr | Epidemiology and control of cowpea mosaic in Western Nigeria |
| title_full_unstemmed | Epidemiology and control of cowpea mosaic in Western Nigeria |
| title_short | Epidemiology and control of cowpea mosaic in Western Nigeria |
| title_sort | epidemiology and control of cowpea mosaic in western nigeria |
| topic | cowpeas infection breeding |
| url | https://hdl.handle.net/10568/98784 |
| work_keys_str_mv | AT glimerr epidemiologyandcontrolofcowpeamosaicinwesternnigeria |