Sunflower Head Rot

Sunflower Head Rot: Rhizopus sp

  • Initial symptom appears as brown irregular water soaked spots on the back of ripening head usually adjacent to flower stalk.
  • Spots gradually enlarge and become soft and pulpy and get covered with superficial white mycelium which later becomes black.
  • Some seeds of the rotted heads shed and those which remain in the head taste bitter.
  • Injury before flowering or during the early stage of head development is unlikely to favour infection even though the inoculum may be present.
  • Maximum rotting is noticed at the soft dough stage.
  • Seed development is severely impaired depending on the stage of maturation at the time of Rhizopus infection and rot development.
  • To have effective control of the disease, simultaneous application of compatible insecticide and fungicide beginning with the completion of the flowering stage is suggested.
  • Injury to the head should be avoided as far as practicable.
  • Spray Mancozeb @ 2g/lit in case of intermittent rainfall at the head stage.
Virus Diseases of Sunflower:
  • Spray Mancozeb 1000g/ha in case of intermittent rainfall at the head stage, directing the spray to cover the capitulum.
  • Repeat fungicidal application after 10 days if the humid weather continues.



  • TamilNadu Agritech Portal
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