Abstract
The CSPWD is the Ghanaian form of lethal yellowing disease (LYD) of coconut, caused by a phytoplasma and has been active in Ghana since 1932. The paper updates the results of screening trials conducted with 38 pure and hybrid coconut varieties since 1981. Although no variety was found totally resistant, a wide range of susceptibility level was observed: almost all SGD were still unaffected, while the local WAT had almost totally disappeared, additive values were calculated for the parental varieties and it was shown that, in the average, hybrids are slightly more susceptible than predicted by a purely additive model. According to this genetic model, the SGD × VTT hybrid will be appreciably less susceptible than the MYD × VTT currently being used for replanting devastated farms in Ghana. Our results tend to confirm the general trend that cultivars from the Pacific group (especially the Dwarfs) are less susceptible than the Indo-Atlantic cultivars. Proposals are made to adapt planting material to the risk level. Genetic control can only be efficient if it is considered as a link in a chain of control measures involving the choice of a proper planting site, good management and early eradication of diseased trees.
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Abbreviations
- ADOT:
-
Andaman Tall
- CATD:
-
Catigan Green Dwarf
- CRD:
-
Cameroon Red Dwarf
- EGD:
-
Equatorial Guinean Green Dwarf (synonym to the Brazilian Green Dwarf)
- LCT:
-
Laccadive Tall
- MRD:
-
Malayan Red Dwarf
- MYD:
-
Malayan Yellow Dwarf
- MLT:
-
Malayan Tall
- PNT:
-
Panama Tall
- RIT:
-
Rennell Island Tall
- SGD:
-
Sri Lanka Green Dwarf
- TACD:
-
Tacunan Green Dwarf
- TAGT:
-
Tagnanan Tall
- TAT:
-
Tahiti Tall (synonym to the Polynesian Tall)
- VTT:
-
Vanuatu Tall
- WAT:
-
West African Tall
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Acknowledgements
The resistance screening programme has been funded at different times by French Embassy Project with Cote d’Ivoire and Ghana, The E.U under its STD 3 project, the World Bank under the National Agricultural Research Project (NARP) and Agricultural Services Sub Sector Investment Project (AGSSIP), the Agence Française de Développement and the Government of Ghana. The Support is gratefully acknowledged. In addition, we wish to acknowledge the great collaboration of Yane Kandassamy and Sandrine Fabre, technicians, for their work done in the laboratory of the Research Unit 29 of Cirad at Montpellier (France) and Dr. Laurence Rassaby who worked with the CIRAD-OPRI team in Montpellier and Takoradi between April 2003 and March 2004.
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Appendix: Results of the Cape Three Points trials (after Mariau et al. 1996)
Appendix: Results of the Cape Three Points trials (after Mariau et al. 1996)
Variety | Cape Three Points | Dixcove | ||||
---|---|---|---|---|---|---|
Total no. of palms | No. of diseased palma | Level of disease (%) | Total no. of palms | No. of diseased palma | Level of disease (%) | |
CRD | 18 | 14 | 77.8 | 4 | 2 | 50.0 |
CRD × MLT | 11 | 5 | 45.5 | 7 | 6 | 85.7 |
CRD × TAT | – | – | – | 9 | 8 | 88.9 |
CRD × RIT | – | – | – | 6 | 6 | 100.0 |
CRD × VTT | – | – | – | 9 | 8 | 88.9 |
CRD × WAT | 18 | 14 | 77.8 | 7 | 7 | 100.0 |
EGD | 10 | 6 | 60.0 | 9 | 3 | 33.3 |
EGD × VTT | – | – | – | 9 | 8 | 88.9 |
EGD × WAT | 9 | 9 | 100.0 | – | – | – |
MLT | – | – | – | 6 | 6 | 100.0 |
MLT × MYD | – | – | – | 10 | 4 | 40.0 |
MLT × VTT | – | – | – | 7 | 5 | 71.4 |
MRD | 13 | 4 | 30.8 | 6 | 4 | 66.7 |
MRD × TAT | 20 | 16 | 80.0 | 7 | 3 | 42.9 |
MRD × WAT | 20 | 14 | 70.0 | 7 | 7 | 100.0 |
MYD | 7 | 1 | 14.3 | 4 | 0 | 0.0 |
MYD × TAT | – | – | – | 5 | 4 | 80.0 |
MYD × RIT | – | – | – | 5 | 5 | 100.0 |
MYD × VTT | – | – | – | 4 | 3 | 75.0 |
MYD × WAT | 16 | 13 | 81.3 | 10 | 9 | 90.0 |
TAT | – | – | – | 8 | 6 | 75.0 |
RIT | – | – | – | 3 | 3 | 100.0 |
RIT × WAT | 29 | 24 | 82.8 | 9 | 9 | 100.0 |
SGD | 19 | 0 | 0.0 | 6 | 0 | 0.0 |
SGD × WAT | – | – | – | 6 | 5 | 83.3 |
VTT | – | – | – | 5 | 0 | 0.0 |
WAT | 19 | 19 | 100.0 | 6 | 6 | 100.0 |
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Dery, S.K., Philippe, R., Baudouin, L. et al. Genetic diversity among coconut varieties for susceptibility to Cape St Paul Wilt Disease. Euphytica 164, 1–11 (2008). https://doi.org/10.1007/s10681-008-9691-8
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DOI: https://doi.org/10.1007/s10681-008-9691-8