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Horticultural crops :: Vegetables:: Tomato

Bacterial leaf spot : Xanthomonas axonopodis pv. vesicatoria 

Field Diagnostic Symptoms

  • Small, brown, water soaked, circular spots with yellow halo on leaves.
  • Defoliation of older leaves.
  • Small, water-soaked spots on green fruit .
  • Centre of spots become irregular, light brown with sunken and scabby surface.

Symptoms on leaves

Causal organism

  • Xanthomonas axonopodis pv. vesicatoria (ex Doidge) Vauterin

Survival and Mode of Spread

Survival :

  • Infected debris

Primary spread:

  • Infected plant debris and seed

Secondary spread:

  • Rain splash

Favourable conditions :

  • Moist weather and splattering rains
  • High humidity or persistent dew.

Integrated Disease Management:

  • Use of disease free seed
  • Spray Streptocycline 40-100 ppm (20 g/ac)

Source of Information

  • https:www.apsnet.org.
  • Crop production guide – Horticulture 2020
  • Acknowledgement

  • Dr.N.Indra, Associate Professor, Department of Plant Pathology, TNAU, Coimbatore
  • Dr.P.Renukadevi, Professor, Department of Plant Pathology, TNAU, Coimbatore.

    Updated on Jun 2023


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