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Common bacterial blight on Bean

Xanthomonas axonopodis pv. phaseoli Chiwawu cha nyemba
  • Use disease free certified seed
  • Practice crop rotation with non host crops like maize and groundnuts for at least 2-3 years to break disease cycle
  • Remove volunteer bean plants after harvest and before planting as they act as a source of inoculum
  • Deep ploughing after harvest to bury the infected crop debris and encourage decomposition
  • Suspend field operation when plants are wet to avoid spreading the disease
  • Do not save and use seeds from the previous infected fields
  • Start monitoring two weeks post seedling emergence and weekly until pod formation
  • Look for water soaked dark spots under the leaf
  • Leaf spots enlarge and merge to form a large brown irregular lesion with a yellow margin
  • Stems rot at the first node where cotyledons are attached causing the plant to break
  • On pods look for sunken lesions with reddish brown boarder
  • Under wet conditions look for yellow slimy bacterial exudates that ooze out of the lesion
  • Carry out direct controls as soon as symptoms are seen
  • Uproot and burn all infected plants
  • Spray recommended insecticides indicated in the Yellow Direct Control section
  • Use personal protective equipment when handling and applying pesticides, follow the label recommendations. Do not eat, drink, smoke when mixing or applying pesticides.
  • Foliar application of Copper oxychloride 860g/Kg WP (Kocide) at 300-400g per 100 litres of water. Copper oxychloride is a bactericide with contact, multisite action. FRAC group: M1
  • WHO Class II (Moderately Hazardous). Apply at 14 day intervals. Do not breathe spray. Harmful if swallowed. Very toxic to aquatic organisms.
AUTHOR(S): Johnny I.G. Masangwa, Department of Agricultural Research Services, MoAIWD

PRODUCED BY: Plantwise

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