Brown spot is a fungus that affects the coleoptile, leaves, leaf sheaths, panicle branches, and glumes.
The most visible harm is the multiple large spots on the leaves that can kill the entire leaf.
Brown leaf spot of rice:
Brown spot disease in rice is caused by the fungus Cochliobolus miyabeanus (originally Helminthosporium oryzae).
Sesame leaf spot, Helminthosporiose, or fungal blight are all names for a brown spot.
Seed infection results in seed germination failure, seedling mortality, and a reduction in grain quality and weight. In severe cases, yields are reduced by 50%.
The disease begins as small brown spots and progresses to cylindrical, oval, and circular shapes. (similar to sesame seed).