Leaf Spot of Cymbidium hybrida Caused by Fusarium proliferatum
1998
Chang Mee | Hyun Ik-Hwa Overseas Pest Division, National Institute of Agricultural Science and Technology, RDA, Suwon (Korea Republic)
Leaf spot of Cymbidium hybrida caused by Fusarium sp. was observed at major cultivating areas including Seosan and Cheonan of Korea from 1996 to 1998. The major symptoms of the disease were small brown to black spots, 1~2 mm in diameter, with yellow halo. Based on the mycological characteristics, Fusarium sp. isolated from the lesions was identified as Fusarium proliferatum. Macroconidia were slender, falcate to almost straight, usually 3 to 5 septate and thin walled. Microconidia were formed in chains from polyphialides, clavate or oval, usually 1-celled with flattened base. Chlamydospores were absent. The fungus showed pathogenicity to Cymbidium hybrida.
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