A chuva como agente de diseminacao do mal rosado do cacaueiro
The role of rainfall in the dispersion of the basidiospores of Corticium salmonicolor was analysed. The water analysed was collected in stemflow and throughfall gauges among cacao trees, 30, 90 and 150 cm apart from the cacao trunk. The experimental area, an 8 year old hybrid cacao plantation, had a natural high incidence of 49 percent of pink disease. The water samples were grouped as diurnal and nocturnal rainfall. A year's data showed that the greater number of basidiospores was found in the stemflow collectors and the pluviometers located 150 cm from the trunk. Weak rains (1.5 mm) and of short duration (2 h) have the greater number of spores in the samples for all the collectors. The larger number of basidiospores per rain sample occurred in February, March, April, July, September and October. These data indicate that rainfall plays an important part in the dispersion of the initial inoculum, but is not the principal agent of pink disease dissemination during its period of major activity.
| Main Authors: | , , |
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| Format: | biblioteca |
| Published: |
1985
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| Subjects: | THEOBROMA CACAO, CORTICIUM SALMONICOLOR, ENFERMEDADES FUNGOSAS, ESPORULACION, DAÑOS, FACTORES AMBIENTALES, LLUVIA, BRASIL, |
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| Summary: | The role of rainfall in the dispersion of the basidiospores of Corticium salmonicolor was analysed. The water analysed was collected in stemflow and throughfall gauges among cacao trees, 30, 90 and 150 cm apart from the cacao trunk. The experimental area, an 8 year old hybrid cacao plantation, had a natural high incidence of 49 percent of pink disease. The water samples were grouped as diurnal and nocturnal rainfall. A year's data showed that the greater number of basidiospores was found in the stemflow collectors and the pluviometers located 150 cm from the trunk. Weak rains (1.5 mm) and of short duration (2 h) have the greater number of spores in the samples for all the collectors. The larger number of basidiospores per rain sample occurred in February, March, April, July, September and October. These data indicate that rainfall plays an important part in the dispersion of the initial inoculum, but is not the principal agent of pink disease dissemination during its period of major activity. |
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