Phytophthora palmivora pod rot of cacao in Papua New Guinea investigations 1962-1971
New field infections of P. palmivora on pods were always present at Keravat in New Britain and no regular high or low incidence seasons occurred during 1962 to 1971. Incidence was over 20 per cent in 1955-56 but less than 3 per cent in 1962-65 and between 10 per cent and 20 per cent in 1969-71. Average annual rainfall for these three periods were 246,277 and 289 mm respectively. No adequate records of rainfall type (e.g., drizzle, squall) are available for the first two periods. On three occasions in 1963-65 long distance (beyond 20 metres) dispersal, as previously reported from Nigeria, was evident, contrasting with the usual short distance (less than 4 m) spread. Control may therefore be directed more economically at individual trees. Some obviously susceptible clones have been recorded in the field but it is not clear whether the remainder are escapes or resistant ones.
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| Format: | biblioteca |
| Published: |
May
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| Subjects: | THEOBROMA CACAO, PHYTOPHTHORA PALMIVORA, ENFERMEDADES FUNGOSAS, INCIDENCIA, PROYECTOS DE INVESTIGACION, PAPUA NUEVA GUINEA, |
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