Early blight(Alternaria solani)

Symptoms

• Potato blight, a common disease affecting potato plants, manifests through characteristic leaf spots and blight, occurring at any growth stage.
• Primarily targeting leaves and tubers, the disease initially presents small circular to oval brown spots on older lower leaves.
• These spots may expand into larger, angular lesions as the disease progresses.
• Mature foliage lesions appear dry and papery, often exhibiting concentric rings resembling a bull's eye, with surrounding tissue potentially turning yellow.
• High temperatures and humidity exacerbate the disease, potentially leading to significant foliage loss.
• Stems may also display similar lesions, which could girdle the plant if near the soil line.
• Tubers affected by the disease exhibit brown, circular to irregular, depressed lesions, with underlying flesh becoming dry, brown, and corky.
• During storage, these lesions tend to enlarge, resulting in shriveled, affected tubers.

Management

• Crop debris and other potential host plants should be collected and disposed of to prevent disease spread.
• Ensure the use of disease-free tubers when planting crops.
• Practice judicious fertilizer application to maintain plant health.
• Provide irrigation during critical stages of crop growth.
• Kufri Sindhuri variety exhibits good resistance to this disease in plains.
• Prevent waterlogging to avoid favorable conditions for disease development.
• Apply urea spray (1.0%) to the crop 45 days after sowing, followed by subsequent sprays 8-10 days apart, to help the crop resist severe early blight disease

Chemical Control

Extremely Toxic

Highly Toxic

Moderately Toxic

Slightly Toxic