Tomato Bacterial Stem & Fruit ​Canker

Tomato Diseases

Bacterial Stem & Fruit ​Canker

• Seedlings, leaves, stem and fruits are affected.
• Spots on leaves, stems and fruits.
• White blister like spots in the margins of leaves and turn brown.
• Wilting of leaves and shoots, streaks on stems and petioles.
• Small, water soaked spots with white halo on fruits.
• Centre of spots become slightly raised.
• Tan coloured and rough.
• Cankers develop and form cracks.
• Slimy bacterial ooze through cracks.
• Vascular discolouration.
•  

• • Causal Organism: Clavibacter michiganensis subsp. michiganensis (Smith) Davis
  • Pathogen: Gram-positive, non-motile, rod-shaped, aerobic bacterium.
  • Survival and Mode of Spread:

  > Survival: In Infected debris> Primary spread: Infected plant debris and seed> Secondary spread: Rain splash

  • Favourable conditions:

  > Soil temperature – 28°C> High humidity or persistent dew> Moist weather with intermittent showers

• ​Field sanitation
• Crop rotation with non host crops
• Use of disease free seeds
• Disinfection of tools and implements
• Removal of weeds