Phytophthora palmivora disease of cocoa in Fiji
In Fiji cocoa has suffered severely from bark canker, caused by Phytophthora palmivora, as well as from black pod. This is largely because, until recently most of the cocoa grown has been of canker-susceptible Criollo ancestry. Plantings of such Trinitario cocoa, made in 1957-63, are now generally only marginally worth maintaining. Forastero cocoa, particularly West African Amelonado, has proved much less susceptible. It does, however, appear to suffer more damage from canker than is generally recognised in West Africa. It is uncertain whether this is because the Fiji strain of P. palmivora is more bark-pathogenic, or because canker is overlooked in West Africa. Black pod losses are serious in Fiji, although perhaps a little less so than would be expected in such a wet climate. Under weekly picking the loss of Amelonado to black pod is typically about 20 per cent. Expressing weekly black pod loss as a percentage of pods at risk has been found to expedite the study of the relationship between black pod loss and weather. A multiple regression expression involving a highly significant temperature term has been calculated, confirming that black pod incidence tends to be higher at low temperature
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| Format: | biblioteca |
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Tafo (Ghana)
1971
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| Subjects: | THEOBROMA CACAO, PHYTOPHTHORA PALMIVORA, PODREDUMBRES, ENFERMEDADES FUNGOSAS, EPIDEMIOLOGIA, CONTROL QUIMICO, TEMPERATURA DEL MEDIO AMBIENTE, CLONES TRINITARIOS, CLONES AMELONADOS, FIJI, |
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