Tomato Early Blight

Tomato Early Blight: Alternaria solani

  • This is a common disease of tomato occurring on the foliage at any stage of the growth.
  • The fungus attacks the foliage causing characteristic leaf spots and blight. Early blight is first observed on the plants as small, black lesions mostly on the older foliage.
  • Spots enlarge, and by the time they are one-fourth inch in diameter or larger, concentric rings in a bull’s eye pattern can be seen in the center of the diseased area.
  • Tissue surrounding the spots may turn yellow. If high temperature and humidity occur at this time, much of the foliage is killed.
  • Lesions on the stems are similar to those on leaves, sometimes girdling the plant if they occur near the soil line.
  • Transplants showing infection by the late blight fungus often die when set in the field. The fungus also infects the fruit, generally through the calyx or stem attachment.
  • Lesions attain considerable size, usually involving nearly the entire fruit; concentric rings are also present on the fruit.
  • Removal and destruction of crop debris.
  • Practising crop rotation helps to minimize the disease incidence.
  • Spray the crop with Mancozeb 0.2 % for effective disease control.




  • TamilNadu Agritech Portal
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