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Leaf spot: Cercospora carthami

Symptom

Symptom Safflower plants few weeks after planting or at flowering stage are commonly attacked. Circular to irregular brown sunken spots of 3-10 mm diameter are formed on leaves. Spots are surrounded by yellow halos. Symptoms first appear on lower leaves and spread to upper leaves. Stems and nodes may also be affected. In severe infections bracts are also affected with reddish brown spots. Affected flower buds turn brown and die. Management Remove and destroy the diseased plants. Deep summer ploughing, Avoid growing in low-lying areas and flooding under irrigation. Seed treatment with thiram 3 g/kg and spraying of mancozeb 2.5 g ; or carbendazim 1 g per litre of water.
  • Safflower plants few weeks after planting or at flowering stage are commonly attacked.
  • Circular to irregular brown sunken spots of 3-10 mm diameter are formed on leaves.
  • Spots are surrounded by yellow halos.
  • Symptoms first appear on lower leaves and spread to upper leaves.
  • Stems and nodes may also be affected.
  • In severe infections bracts are also affected with reddish brown spots.
  • Affected flower buds turn brown and die.
  • Remove and destroy the diseased plants.
  • Deep summer ploughing,
  • Avoid growing in low-lying areas and flooding under irrigation.
  • Seed treatment with thiram 3 g/kg and spraying of mancozeb 2.5 g ; or carbendazim 1 g per litre of water.