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Narrow brown leaf spot Photo Identification

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  • Pest Type: Disease
  • Crops Affected: Rice
  • Scientific Name: Cersospora oryzae
Symptoms
Symptoms are most commonly seen in late growth stages and consist of short, elliptical to linear brown lesions on the leaf blades. Lesions are darker and smaller on resistant cultivars, and wider and lighter brown with gray necrotic centers on susceptible cultivars. Similar symptoms may be seen on leaf sheaths, pedicels and glumes.

Disease Cycle
Narrow brown leaf spot, also know as Cercospora leaf spot, enters through the stomata and grows in host tissue cells. Symptoms may not be seen for up to 30 days after infection. Optimum growth of the fungus occurs at 77-82 F. Rice plants are most susceptible from panicle emergence to maturity.



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