A propose de l'epidemiologie de Phytophthora palmivora
The chief object of epidemiological studies of Phytophthora palmivora is in connection with chemical control. The greater part of the work to date has been done on detecting the sources of inoculum and its concentration. General observations stress the following points in the Cameroun. - The importance, as primary and permanent sources of infection, of pod shells lying on the ground or rotting on the trees. - The importance, as secondary and permanent sources of infection, of diseased pods in the field. - The part played by crawling and flying insects. - The relation between yield and degree of attack. In the East Cameroun, the principal source of infection is the soil. Infection begins on the lowest pods and rises from them. In the West Cameroun, all pods irrespective of position are equally vulnerable. We have, therefore, found two differents methods of attack and suggest that attempts to show a single epidemiological development cannot be correct. There is a complex of a large number of factors, which differ from place to place and are influenced by the local micro-climate. It is necessary to study all factors in the local environment
| Main Authors: | , , , , , , , , |
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| Format: | biblioteca |
| Published: |
St. Augustine (Trinidad y Tobago)
1972
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| Subjects: | THEOBROMA CACAO, PHYTOPHTHORA PALMIVORA, PODREDUMBRES, ENFERMEDADES FUNGOSAS, EPIDEMIOLOGIA, CAMERUN, |
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