Bacterial Diseases: Bacterial Brown Spot | Series 7


The symptoms may appear anywhere on the leaf as a small, soft, water-soaked blister. Initially light or yellowish-brown or lighter green in colour, the infected spot enlarges, coalesces and eventually becomes brown or black, dried up and sunken. It oozes bacteria-laden liquid, particularly when the disease reaches the tip of the leaf. If the diseased area invades the crown, the plant will die. It is most prevalent during the warmer weather. 




Treatment of all fungal or bacterial diseases starts with the following:

  • Isolate the plant from other plants in your collection.
  • Remove or Cut all the infected leaves/canes/roots or parts of the plant with a sterilized tool.
  • Each time the cutting tool contacts infected tissue, it should be sterilized before making a second cut.
  • Chemical treatment with following on all plants in the collection.

Following chemicals are effective:

    • Chemical Name:
      • Kasugamycin (Brands: Biomycin, Kasu-B) | Dosage: 1ml per litre of water
      • Streptomycin and Tetracycline (Brands: Plantomycin) | Dosage: 1g per 10 litres of water (Do not overdose)

Keeping the plants drier will help to keep the infection from spreading or appearing again. Isolate the plants and observe the plants for 1-2 weeks. And apply another round of control spray with any of the above fungicides. Spray the plants early morning and keep the plants dry after the spraying. Don't water the plants same day spray treatment is done.


  • Avoid Over-watering
  • Provide good circulation
  • Proper hygiene in the growing area
  • Sterilization of cutting tools before every use
  • Frequent Inspection 
  • Isolation of suspicious plants
  • Precautionary control sprays 
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