Vascular Streak Dieback of Cocoa in West Malaysia
A detailed study into vascular streak dieback (VSD), the most serious pathological problem of cocoa in Malaysia was carried out. The causal pathogen was isolated and the symptomatology relating to infection of mature cocoa and seedling in the nurseries has been described. Morphological studies o...
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| 格式: | Thesis |
| 語言: | English English |
| 出版: |
1982
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| 主題: | |
| 在線閱讀: | http://psasir.upm.edu.my/id/eprint/10201/1/FP_1982_4.pdf |
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| 總結: | A detailed study into vascular streak dieback (VSD), the most
serious pathological problem of cocoa in Malaysia was carried out.
The causal pathogen was isolated and the symptomatology relating
to infection of mature cocoa and seedling in the nurseries has been
described. Morphological studies of the local isolates have
confirmed the close similarity of the VSD fungus to Oncobasidium
theobromae Talbot and Keane, described as the primary causal agent
of VSD in Papua New Guinea. Techniques useful for isolation of the
pathogen in routine and sequential samplings were investigated.
The use of nutrient poor medium, surface treatment of infected
materials and plating samples within 48 hours after collection
from the field had improved the efficiency of isolation of the
VSD pathogen. The leaf isolation technique developed is a rapid
and non-destructive method for isolation of the pathogen and
confirmation of VSD incidence especially in seedlings in the
nursery.
A survey of the disease undertaken confirmed incidence of VSD
in mature plantings in the states of Trengganu, Johor, Perak and
Malacca; cocoa nurseries in Perak and Johor; and clonal plantings
in Negeri Sembilan. In all cases, the percentage incidence and
severity varied from locality to locality. Generally, the survey
of clonal plantings had provided information On the relative
susceptibility within clones.
The fungus hitherto recorded to grow poorly On artificial media,
had been found to grow satisfactorily on Corticium culture medium
and On Leonian's solution agar. |
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