Development of coffee berry disease in relation to the stage of berry growth
The susceptibility of coffee berries to coffee berry disease (CBD) varies with the stage of berry development. It is well known that manure green berries are relatively resistant, while ripening berries are highly susceptible; however, differences in susceptibility of berries during early stages of development have not hitherto been examined in any detail. Experiments were carried out at a medium-altitude site (5200 ft) to examine the effect of inoculation, in the field, 4, 6, 10 and 14 weeks after flowering. The highest infection rates occurred when berries were inoculated 6 and 10 weeks after flowering when the berries were expanding rapidly. At 4 weeks, when berries were at the "pinhead" stage, and at 14 weeks, when they were attaining full size, much lower rates were recorded. Comparable results have also been obtained at a high altitude (6000 ft) site. In an experiment carried out on a long-rains crop, flowering on 1 March, lesios regularly developed 2-4 weeks after inoculation, wheares in an experiment on a short rains crop, flowering at the end of October, symptom expression was apparently delayed. Possible reasons for this difference are discussed
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| Format: | biblioteca |
| Published: |
1970
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| Subjects: | ENFERMEDADES FUNGOSAS, COLLETOTRICHUM, INFECCIONES, FRUTO, ETAPAS DE DESARROLLO DE LA PLANTA, COLLETOTRICHUM COFFEANUM, |
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| Summary: | The susceptibility of coffee berries to coffee berry disease (CBD) varies with the stage of berry development. It is well known that manure green berries are relatively resistant, while ripening berries are highly susceptible; however, differences in susceptibility of berries during early stages of development have not hitherto been examined in any detail. Experiments were carried out at a medium-altitude site (5200 ft) to examine the effect of inoculation, in the field, 4, 6, 10 and 14 weeks after flowering. The highest infection rates occurred when berries were inoculated 6 and 10 weeks after flowering when the berries were expanding rapidly. At 4 weeks, when berries were at the "pinhead" stage, and at 14 weeks, when they were attaining full size, much lower rates were recorded. Comparable results have also been obtained at a high altitude (6000 ft) site. In an experiment carried out on a long-rains crop, flowering on 1 March, lesios regularly developed 2-4 weeks after inoculation, wheares in an experiment on a short rains crop, flowering at the end of October, symptom expression was apparently delayed. Possible reasons for this difference are discussed |
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