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Bacterial Blight on common Bean

Xanthomonas axonopodis. pv. phaseoli
  • Plant resistant varieties e.g. new rose coco, miezi mbili and red kidney.
  • Plant certified seed from certified dealers.
  • Remove and burn crop debris.
  • Plough deep and bury crop residues to enable breakdown of infected plant debris.
  • Rotate with non leguminous crops e.g. maize, cabbages for 2 - 3 seasons.
  • Ensure proper crop nutrition to keep plant vigour.
  • Keep the field free of weeds and volunteer plants.
  • Use furrow or drip irrigation to avoid spread of the disease when leaves are wet.
  • Avoid field operations when the leaves are wet
  • Disinfect plant implements when moving from one field to the other.
  • Use proper spacing (50cm x 10cm) to ensure air circulation
  • Intercrop beans with maize to prevent spread of the disease from one row to the other.
  • Look for small angular water soaked reddish brown spots that enlarge and turn necrotic on leaves surrounded by a bright yellow halo.
  • Look out for small water soaked lesions which become sunken and dark red-brown on pods.
  • Check for yellow or brown spots on seeds near the hilum. Under severe infection, seeds appear shrivelled. A yellowish bacterial ooze is released from the lesions under humid conditions.
  • Remove and burn infected plants.
  • Practise soil solarisation to kill bacterial inoculum in the soil. Cover your soil with a transparent plastic paper for 4 weeks during hot seasons to kill the bacteria in the soil.
  • Avoid introducing bacterial infections to farms because they are difficult to eradicate completely from the soil once introduced.
  • WHO class II pesticides might not be allowed in local IPM schemes.
  • Spray copper oxychloride WG (eg Cupro Caffaro Micro 37.5 at a rate of 50gm/20lts water and Isacop 50WP at a rate of 50-60g/20litres of water). Spray early in the morning or late in the evening to minimize pesticide drift. Avoid spraying two hours before rainfall.
  • WHO class II (Moderately hazardous). Irritant to the eyes. Re-entry: when the chemical spray dries up
AUTHOR(S): Anne W. Kimani (UoN) Tel.: +254720 452 066, email:; Boniface N. Ndung’u (MoALVF) Tel: +254 723 377 341, email:; Jacob Ndung’u(MoALVF); Tel: +254 724 507 901 email:, Miriam Otipa, Kenya Agricultural Livestock Research Organization, Tel +254 710808312,

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