Indices para avaliar a reacao de cultivares de cacau a Phytophthora spp.
A grading system is proposed to measure the reaction of cultivars and hybrid progenies of cacao when inoculated with Phytophthora spp. The indices vary for each species according to its virulence to the cacao plant. The diameter of the lesions caused by P. capsici are one half and one third of those caused by P. palmivora and P. citrophthora respectively. The index scale obeys the proportions which are obtained generally when pods are inoculated and has to be applied to the mean of the diameters of the lesions obtained 9 days after the inoculation. In all tests highly susceptible cultivars were included as standards.
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| Main Authors: | , |
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| Format: | biblioteca |
| Published: |
1984
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| Subjects: | THEOBROMA CACAO, CLONES, PHYTOPHTHORA CAPSICI, PHYTOPHTHORA PALMIVORA, PHYTOPHTHORA CITROPHTHORA, ENFERMEDADES FUNGOSAS, RESISTENCIA A LA ENFERMEDAD, ESCALAS DE EVALUACION, |
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| Summary: | A grading system is proposed to measure the reaction of cultivars and hybrid progenies of cacao when inoculated with Phytophthora spp. The indices vary for each species according to its virulence to the cacao plant. The diameter of the lesions caused by P. capsici are one half and one third of those caused by P. palmivora and P. citrophthora respectively. The index scale obeys the proportions which are obtained generally when pods are inoculated and has to be applied to the mean of the diameters of the lesions obtained 9 days after the inoculation. In all tests highly susceptible cultivars were included as standards. |
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