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Tobacco Anthracnose – Kisan Suvidha
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Tobacco Anthracnose

Tobacco Anthracnose

Tobacco Anthracnose: Colletotrichum tabacum

Symptom:
  • The disease causes serious damage to the seedlings in nurseries only and it occurs rarely in the fields.
  • Initially, the infection starts on lower leaves as pale-brown circular spots of 0.5 mm diameter with papery depressed centres outlined by a slightly raised brown margin.
  • The leaf-spots may remain small with white areas in the centre or coalesce to form large necrotic lesions.
  • Under the continuous humid weather, dark brown or black, elongated, sunken necrotic lesion appears on midrib, petiole and stem resulting in petiole and stem rot. Such seedlings do not establish in the field if planted. The primary infection starts from affected bits of aerial parts left in the soil in the previous season.
  • The pathogen is not seed-borne but persists in the soil on dried plant debris.
Management:
  • Raised seed beds and rabbing with farm wastes help in reducing the initial infection
  • Removal and destruction of all diseased debris minimizes the pathogen in the soil.
  • Discarding the diseased seedlings especially with necrotic lesions on the stem will save gap filling in the field.
  • Protective spraying with Bordeaux mixture at 1.0% or 0.2% (2 g/lit) Mancozeb during wet weather especially in nurseries where anthracnose appeared in a previous season, is helpful.

 

Source-

  • TamilNadu Agritech Portal

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