Causal Organism of Rice Eye Spot disease:
Causal organism for Rice Eyespot disease is "Drechslera gigantea".
Symptoms of Rice Eyespot disease:
1. Small size water soaked spots appear on the leaves and finally, olivaceous dots or rings.
2. A yellow halo frequently appears around young spots but later disappears.
3. Later spots develop into minute, longitudinally elongated, oval lesions with white to straw colored necrotic centres surrounded by narrow, dark brown margins.
http://www.apsnet.org/publicat ions/PlantDisease/BackIssues/ Documents/1980Abstracts/PD_64_878.htm