The resistance and tolerance of different cocoa varieties to cocoa swollen-shoot virus in Ghana
The resistance and tolerance to infection with cocoa swollen-shoot virus (virulent strain A) of forty-five and thirty-eight cocoa progenies respectively was estimated using a manual inoculation method. Resistance was estimated from the proportion of inoculated seedlings which developed symptoms, and tolerance from the severity of these symptoms during a 4-month period. Resistance was found among Nanay, Iquitos and Scavina, all Upper Amazon types; and an inter-Nanay cross was outstandingly resistant and offers scope for improvement by breeding. Some Amazon-Amazon and Trinitario-Amazon progenies showed tolerance, especially those with Trinitario T9/21 as a parent. Some progenies seem sufficiently promising for field testing to select varieties suitable for planting in those areas in Ghana where swollen-shoot disease is epidemic
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| Formato: | biblioteca |
| Publicado: |
1970
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| Materias: | THEOBROMA CACAO, PROGENIE, COCOA SWOLLEN SHOOT VIRUS, VIROSIS, RESISTENCIA A LA ENFERMEDAD, INOCULACION MANUAL, GHANA, |
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