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Diplodia oryzae (leaf spot )
Diplodia oryzae
leaf spot
Africa: South Africa; Asia: Myanmar, Taiwan; North America: USA; South America: Brazil
LA
2025-12-26
fungus
Korea
rice
DIPLOR
Diplodia oryzae causes stem rot, grain discoloration, and panicle blight, leading to reduced yield and seed quality. The fungus produces dark, pycnidial fruiting bodies on infected plant tissue. It survives on crop residues and can be isolated from rice seeds, although seed transmission to seedlings has not been conclusively demonstrated. Warm, moist conditions favor disease development. Management includes using healthy or treated seeds, removing infected debris, and planting resistant varieties when available.
Crops
Oryza sativa
rice
No
DIPLOR-2, CABI CPC, RICH ISTA
In rice, Diplodia oryzae survives and spreads on crop residues; however, the role of seed as a dissemination pathway remains uncertain, because although it has occasionally been isolated from rice seeds, no studies have conclusively demonstrated transmission from seed to seedlings under natural or experimental conditions. The overall impact of this pathogen on rice production appears limited, and it has been infrequently studied since the 1950s.
Yes
Freezing blotter incubation
This method was used for research purposes and has not been validated or standardized.
DIPLOR-2
2025-12-26 17:50:16
DIPLOR-2
Wu, WS. 1994. A Survey of Rice Seedborne Fungi in Taiwan. Plant Dis. 78:316.
CABI CPC
Crop Protection Compendium. Wallingford, UK: CAB International. www.cabi.org/cpc.
RICH ISTA
Richardson, MJ. 1990. An Annotated List of Seedborne Diseases. International Seed Testing Association, Zurich Switzerland.
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