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Bacterial Leaf Spot of Tomato – Kisan Suvidha
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Bacterial Leaf Spot of Tomato

Bacterial Leaf Spot of Tomato

Bacterial Leaf Spot of Tomato: Xanthomonas campestris pv. vesicatoria

Symptom:
  • Moist weather and splattering rains are conducive to disease development. Most outbreaks of the disease can be traced back to heavy rainstorms that occur in the area.
  • Infected leaves show small, brown, water soaked, circular spots surrounded with a yellowish halo.
  • On older plants, the leaflet infection is mostly on older leaves and may cause serious defoliation.
  • The most striking symptoms are on the green fruit. Small, water-soaked spots first appear which later become raised and enlarge until they are one-eighth to one-fourth inch in diameter.
  • Centers of these lesions become irregular, light brown and slightly sunken with a rough, scabby surface.
  • Ripe fruits are not susceptible to the disease. The surface of the seed becomes contaminated with the bacteria, remaining on the seed surface for some time.
  • The organism survives in alternate hosts, on volunteer tomato plants and on infected plant debris.
Management:
  • Disease-free seed and seedlings should always be used and the crop should be rotated with non-host crops so as to avoid last years crop residue.
  • Seed treatment with mercuric chloride (1:1000) is also recommended for control of the disease.
  • Spraying with a combination of copper and organic fungicides in a regular preventative spray program at 5 to 10-day intervals or Spraying with Agrimycin-100 (100 ppm) thrice at 10 days intervals effectively control the disease.

 

Source-

  • TamilNadu Agritech Portal

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