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Post Harvest Diseases:: Vegetables:: Chilli

Bacterial Soft Rot: Erwinia carotovora subsp. carotovora
Symptom:
  • Dark veinal tissue followed by leaf chlorosis and necrosisInternal dark brown discoloration
  • Stem cankers develop -  breakage of branches
  • Wilting and drying
  • Fruit peduncle - highly susceptible & is frequently the initial point of infection
  • Both ripe and green fruit may be affected
  • Initially, the lesions on the fruit are light to dark-colored, water-soaked, and somewhat sunken
  • In later stages, bacterial ooze may develop from affected areas, and secondary organisms follow, often invading the rotted tissue
  • Affected fruit hang from the plant like a water-filled bag
 
  Soft tissue on peduncle Water soaked sunken spots Rotten chilli
Identification of pathogen:
  • The bacterium is gram negative, rod shaped with 1-6 peritrichous flagella.

Management:

Disease incidence could be reduced by

  • Early detection of symptoms
  • Disinfection of pruning tools
  • Avoidance of wounding plants
  • Remove plant debris - fallen, diseased leaves
  • Seed treatment –   1% sodium hypochlorite for 30 sec, then rinse with clean water
  • Avoid planting pepper crops following crops of potato or cabbage
  • Rotate instead with crops of bean, corn and soybean

Post-harvest disease management

  • Use chlorinated water to reduce populations of soft rot bacteria and to reduce the risk of infection during washing
  • Allow fruit to dry thoroughly
  • During packing and storage, the fruit should be kept clean and maintained in a cool, dry place
Source of Images:
www.avrdc.org/download/publications/crop-guides/peppers/bact_rot.pdf
http://aciar.gov.au/files/mn-157/pdf/TECCIPM-14-%2818Dec13%29-bacterial-diseases.pdf

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