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Safflower alternaria leaf spot

Alternaria leaf spot (Alternaria carthami)

Nature of Damage:

  • Severe in irrigated crop and in warmer areas particularly under frequent showers of cyclonic cloudy weather.
  • Seed may rot and damping off of seedlings occur.
  • Brown discolouration appears on the stem, dark brown spots with concentric ringns upto 1 cm in diameter appear on the leaves which later develop into larger lesions.
  • Later hole is formed at the spotted patches.

Cultural Control:

  • Seed the crop at the recommended time.
  • Avoid growing in low lying areas and flooding under irrigation.
  • Avoid continuous growing of safflower.
  • Remove and destroy the diseased plants.
  • Do not delay irrigation until the crop exhibits moisture stress symptoms.

Chemical Control:

  • Spray mancozeb (0.25%) immediately after disease is noticed and repeat the spray 15 days later depending on the intensity of disease.

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