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PEST MANAGEMENT DECISION GUIDE: GREEN AND YELLOW LIST

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.