Complex circular leaf spot (CCLS) disease detection in Malaysian rubber plantation
To date, a new leaf spot disease of rubber trees has been identified in five rubber producing countries namely Indonesia, India, Malaysia, Thailand, and Sri Lanka with infected leaves exhibiting a circular spot with a brown necrotic lesion. However, no research has confirmed the actual causal pa...
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
Agriculture Faculty, Universitas Syiah Kuala, Acheh, Indonesia
2024
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| Online Access: | http://psasir.upm.edu.my/id/eprint/119968/ http://psasir.upm.edu.my/id/eprint/119968/1/119968.pdf |
| Summary: | To date, a new leaf spot disease of rubber trees has been identified in
five rubber producing countries namely Indonesia, India, Malaysia, Thailand,
and Sri Lanka with infected leaves exhibiting a circular spot with a brown
necrotic lesion. However, no research has confirmed the actual causal
pathogen/s of this disease. This study aimed to determine the primary fungal
pathogen that causes leaf spot symptoms on matured rubber leaves via in vitro
pathogenicity tests. Severity of the infection was graded based on the size of
the lesion. Eight treatments were designed for this in vitro pathogenicity test.
The wounding technique produced a necrotic lesion on the surface of the leaves
as early as three days after inoculation. Wounded leaves inoculated with both
mycelial plugs of Colletotrichum siamense and Pestalotiopsis jesteri produced
mean lesion lengths of 12.1 mm ± 1.15a and 6.08 mm ± 0.04b
, respectively. From
the results obtained, P. jesteri could be the opportunistic pathogen that infects
rubber leaves when they are wounded and is associated with C. siamense.
Therefore, it is possible to draw the conclusion that P. jesteri is the secondary
pathogen and C. siamenseis the primary causative pathogen of the new leaf spot
disease in rubber |
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