Cookies on Plantwise Knowledge Bank

Like most websites we use cookies. This is to ensure that we give you the best experience possible.


Continuing to use means you agree to our use of cookies. If you would like to, you can learn more about the cookies we use.

Plantwise Knowledge Bank

Your search results


Bacterial leaf blight on Black pepper

Xanthomonas sp., Pseudomonas sp Sinhala- Bacteria pathra angamaraya Tamil- Milkil bacterial ilai veliral / ilai pulli
Sri Lanka
  • Obtain rooted cuttings from the disease-free healthy mother vines
  • Maintain good sanitary conditions for nursery as well as for workers
  • Remove shade nets in the rainy seasons
  • Treat plants with 1% Bordeaux mixture immediately after removing them from the humid chamber If plants are produced in a nursery with the disease history, (refer yellow direct control)
  • Look for following symptoms:
  • black colour water soaked lesions with yellow halo in the leaves
  • reddish colour watery patches under side of the affected leaves especially in the morning (before 10.00am)
  • Coalition of small water soaked lesions forming large rotted watery patches
  • Shedding of leaves and internodes
  • Separate the plants with mild infection in nursery and remove those affected leaves and destroy
  • Remove all the highly affected plants and destroy by burning
  • Spray 1% Bordeaux mixture
  • Only for nursery treatments. Dissolve 100g of lime in to 9lit. of water and dissolve 100 g of copper sulphate in 1 lit. of water separately, using plastic or clay pot. Slowly add the copper sulphate solution to the lime solution until colour changes to dirty green. Immerse a stainless-steel knife with a polished blade to test the availability of free copper. If the blade shows reddish colour, add more lime solution
AUTHOR(S): W.M.R.W.B. Wijekoon (Dept. of Export Agriculture)

CREATED/UPDATED: August 2018/August 2020
PRODUCED BY: Plantwise

©CAB International. Published under a CC-BY-SA 4.0 licence.