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Small Circular Brown Necrotic Spots on the Lower Leaves

Cause: Blight

Symptoms detailing
  1. This disease damages leaves, stems and tubers/fruits. Affected leaves appear blistered as if scalded by hot water and eventually rot and dry out.
  2. When drying out, leaves turn brown or black in color. When infections are still active, spots appear on the underside of leaves blanketed in what looks like flour.
  3. Affected stems begin to blacken from their tips, and eventually dry out.
  4. Severe infections cause all foliage to rot, dry out and fall to the ground, stems to dry out and plants to die.
  5. Affected tubers/fruits display dry brown-colored spots on their skins and flesh.
  6. This disease acts very quickly. If it is not controlled, infected plants will die within two or three days.

Management

Cultural:

  1. Use disease free seeds or planting material.
  2. Crop rotation
  3. Use disease resistant seeds or planting material

 Biological: Spraying of Pseudomonas fluorescens+ Bacillus subtilis @5g/L

 

Chemical:

  1. Chlorothalonil 75%WP @2g/L,
  2. COC @ 2-3g/L,
  3. Metalaxyl 8% + Mancozeb 64%WP @ 3g/L

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