Citation
Chee K. H., . Studies of sporulation pathogenicity and epidemiology of Corynespora cassiicola on Hevea rubber. pp. 21-29. ISSN 0127-7065
Abstract
Corynespora cassiicola infects the leaves of Hevea rubber and causes rapid leaf fall. Isolates varied in their ability to produce spores and sporulation was best on potato sucrose agar. Conidial sporulation was highest when cultures were incubated in the dark for three days followed by a daily 2 h exposure to ultra-violet light or continuous light for three to six days. Field or single spore isolates varied greatly in cultural morphology and rate of sporulation ranging from nil to 650 spores per square centimetre of agar surface. Conidia germinated within 4 h. Germ tubes arose more often from the end cells of the spores. Leaves are most susceptible to infection for up to four weeks. Hevea clones differ in their degree of susceptibility but immunity is common. Infection of leaf discs in the laboratory correlates well with field susceptibility. One hundred and thirty-seven clones were screened for resistance in both laboratory and field tests. Conidia from RRIC 103 the most susceptible clone were not particularly aggressive. None of the several hosts tested was infected by the isolates from Hevea. C. cassiicola released its spores from 0800 h and attained a peak around noon; it gradually fell to a very low level in the evening and remained low throughout the early hours of the morning. There was no clear-cut seasonal pattern of spore release in relation to rainfall.
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Abstract
Corynespora cassiicola infects the leaves of Hevea rubber and causes rapid leaf fall. Isolates varied in their ability to produce spores and sporulation was best on potato sucrose agar. Conidial sporulation was highest when cultures were incubated in the dark for three days followed by a daily 2 h exposure to ultra-violet light or continuous light for three to six days. Field or single spore isolates varied greatly in cultural morphology and rate of sporulation ranging from nil to 650 spores per square centimetre of agar surface. Conidia germinated within 4 h. Germ tubes arose more often from the end cells of the spores. Leaves are most susceptible to infection for up to four weeks. Hevea clones differ in their degree of susceptibility but immunity is common. Infection of leaf discs in the laboratory correlates well with field susceptibility. One hundred and thirty-seven clones were screened for resistance in both laboratory and field tests. Conidia from RRIC 103 the most susceptible clone were not particularly aggressive. None of the several hosts tested was infected by the isolates from Hevea. C. cassiicola released its spores from 0800 h and attained a peak around noon; it gradually fell to a very low level in the evening and remained low throughout the early hours of the morning. There was no clear-cut seasonal pattern of spore release in relation to rainfall.
Additional Metadata
| Item Type: | Article |
|---|---|
| AGROVOC Term: | Hevea rubber |
| AGROVOC Term: | Leaves |
| AGROVOC Term: | Incubation of a disease |
| AGROVOC Term: | Isolation |
| AGROVOC Term: | Isolation techniques |
| AGROVOC Term: | Ultraviolet light traps |
| AGROVOC Term: | Fluorescence |
| AGROVOC Term: | Corynespora cassiicola |
| AGROVOC Term: | Culture techniques |
| AGROVOC Term: | Sporulation |
| Geographical Term: | Malaysia |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 28 Apr 2025 05:14 |
| URI: | http://webagris.upm.edu.my/id/eprint/23569 |
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