Brown spotCaused by: Cochliobolus miyabeanus
Problem Category: Fungal Disease
Symptoms: Circular, brown lesions on seedling; distorted primary and/or secondary leaves on seedlings; black discoloration of roots; death of seedlings; circular or oval lesions with gray center and reddish-brown margin on older plants; death of large areas of leaves; brown or black spots on grain; reduced number of grains; reduced kernel weight
Comments: Occurs wherever rice is grown; fungus overwinters on plant debris; disease emergence favored by water on surfaces of plant
Management: Ensure plants are provided with correct nutrients and avoid water stress; chemical seed treatments are effective at reducing the incidence of the disease
Control: Apply 10 quintals/acre vadisaku(chlistanthus chilonis) leaves and rot in the field or apply ash on the field to control the spread of disease.