The occurrence of oospores in cultures of Phytophthora palmivora in Ghana
Oospores of Phytophthora palmivora, the pathogen causing cocoa black pod disease, has been observed for the first time in Ghana. The spores were observed in cultures on sterilised soil extract agar. The cultures were obtained from lesions that developed on green cocoa pods placed on moist field soil. The spores appeared usually within 7 days of transferring pieces of lesion material onto the soil agar. Cultures that formed oospores produced rounded sporangia more readily than the typical papillate sporangia. Oospore-forming cultures have so far been recorded from the Eastern Central and Ashanti Regions of Ghana and suggests that such strains are widely distributed. This clearly indicates that the Ghanian isolates of P. palmivora may not only be of the A2 strain. The possibility of new pathotypes arising as a result of genetic recombination and the effect of this on breeding cocoa varieties for black pod disease resistance are discussed
| 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, AISLAMIENTOS, OOSPORAS, GHANA, |
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| Summary: | Oospores of Phytophthora palmivora, the pathogen causing cocoa black pod disease, has been observed for the first time in Ghana. The spores were observed in cultures on sterilised soil extract agar. The cultures were obtained from lesions that developed on green cocoa pods placed on moist field soil. The spores appeared usually within 7 days of transferring pieces of lesion material onto the soil agar. Cultures that formed oospores produced rounded sporangia more readily than the typical papillate sporangia. Oospore-forming cultures have so far been recorded from the Eastern Central and Ashanti Regions of Ghana and suggests that such strains are widely distributed. This clearly indicates that the Ghanian isolates of P. palmivora may not only be of the A2 strain. The possibility of new pathotypes arising as a result of genetic recombination and the effect of this on breeding cocoa varieties for black pod disease resistance are discussed |
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