Symptoms and prevention measures of Alternaria leaf blight disease in cotton crops

Alternaria Leaf Spot Disease

It is a seed borne disease caused by a fungus called Alternaria macrospora. Due to this disease, small brown spots are formed on the upper surface of the leaves, which later become dark brown and circular. The circular ring formed in these spots is the main feature of its identification. Due to excessive infestation, the leaves drop from the diseased plants.

Chemical Management

• Spray Tilt (Propiconazole 25% EC) @ 200 ml or Antracol (Propineb 70% WP) @ 600 gm + SilicoMaxx @ 50 ml per acre, @ 150 to 200 liters of water. 

Biological Management

• Spray Combat (Trichoderma viride @ 500 gm) or Monas-curb (Pseudomonas fluorescens 1% WP) @ 500 gm per acre, @ 150 to 200 ltr of water.

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