Citation
Bong C. L., . and Milin Stephen, . (1999) An in vitro study on the interaction between cocoa genotypes and cocoa isolates of phytophthora. [Proceedings Paper]
Abstract
The aggressiveness of two species and a total of nine isolates ofcocoa Phytophthora collected from three climatically different regions of Sabah was tested on ten cocoa genotypes. The most aggressive isolates were isolates LKMJ370 and LKMJ339 of Phytophthora palmivora from Tawau where annual rainfall is around 2150mm. The moderately aggressive isolates include the two from Sandakan LKMJ372 and LKMJ373 where annual rainfall is about 321Omm; one from Tawau LKMJ369 two from Keningau LKMJ76 LKMJ102 and the least aggressive was one from Tenom LKMJ85 where annual rainfall is around 1630mm to 1920mm. The one isolate of P. nicotianae LKMJ7 from Tenom is apparently moderate in terms of aggressiveness. Among the ten clones tested against the nine isolates compared against PBC123 and K82 as the standard check clones the most resistant clones include PBC236 and PBCI54. Those comparable in resistance to K82 or PBC 123 include PBC 137 PBC159 KKM2 KKM22 and KKM25. P7 another standard check clone used is apparently less resistant than PBCl23 and K82. PBC137 is comparable to P7. Interaction between the cocoa clones and pathogen isolates is found to be significant suggesting the presence of host-pathogen specificity.
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Abstract
The aggressiveness of two species and a total of nine isolates ofcocoa Phytophthora collected from three climatically different regions of Sabah was tested on ten cocoa genotypes. The most aggressive isolates were isolates LKMJ370 and LKMJ339 of Phytophthora palmivora from Tawau where annual rainfall is around 2150mm. The moderately aggressive isolates include the two from Sandakan LKMJ372 and LKMJ373 where annual rainfall is about 321Omm; one from Tawau LKMJ369 two from Keningau LKMJ76 LKMJ102 and the least aggressive was one from Tenom LKMJ85 where annual rainfall is around 1630mm to 1920mm. The one isolate of P. nicotianae LKMJ7 from Tenom is apparently moderate in terms of aggressiveness. Among the ten clones tested against the nine isolates compared against PBC123 and K82 as the standard check clones the most resistant clones include PBC236 and PBCI54. Those comparable in resistance to K82 or PBC 123 include PBC 137 PBC159 KKM2 KKM22 and KKM25. P7 another standard check clone used is apparently less resistant than PBCl23 and K82. PBC137 is comparable to P7. Interaction between the cocoa clones and pathogen isolates is found to be significant suggesting the presence of host-pathogen specificity.
Additional Metadata
| Item Type: | Proceedings Paper |
|---|---|
| Additional Information: | Available at Perpustakaan Sultan Abdul Samad Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia. Call number mal SB 950 I61 1999 |
| AGROVOC Term: | Phytophthora |
| AGROVOC Term: | In vitro experimentation |
| AGROVOC Term: | Cocoa plant |
| AGROVOC Term: | Genotypes |
| AGROVOC Term: | Rainfall |
| AGROVOC Term: | Clones |
| AGROVOC Term: | Pathogens |
| AGROVOC Term: | Hosts |
| Geographical Term: | MALAYSIA |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 05:15 |
| URI: | http://webagris.upm.edu.my/id/eprint/12336 |
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