Brown Spot

Features

• The disease is caused by Cochilobolus miyabeanus (Helminthosporium oryzae).
• The pathogen infects the coleoptiles of the seeding and causes blighting.
• On the leaves, circular or oval, dark brown to purplish-brown spots are found.
• In severe conditions, these lesions may coalesce and cover the entire leaf.
• The disease symptoms also appear on grains where black spot appear on glumes.
• The kernels of infected spikelets become shriveled and discolored.

 

Control Measures:

The following steps may be taken to control the disease:

 

• Add muriate of potash to correct the potash deficiency in soil, because the severity of disease increases in deficient soils. Apply balanced NPK fertilizers.
• Give three to four sprays with 0.2% Zineb or Mancozeb 75 WP at an interval of 10-12 days just before the appearance of initial symptoms of the disease.