Common blight

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Is this a Minor Pest?
Yes
Minor Pest Title

Common blight (Xanthomonas axonopodis pv. phaseoli)

Minor Pest Description

This disease is a constraint to bean production in Kenya. Crop losses of between 10 and 75% have been reported. The common blight produces similar symptoms on leaves, pods, stems and seeds. Small water-soaked spots are the first symptoms observed on leaves and appear within 4 to 10 days of infection. As the spots develop, the centre becomes dry and brown. The lesion is surrounded by a narrow band of bright yellow tissue. However, yellowed tissue is occasionally absent.

Minor Pest What to do.
  • Intercropping bean with maize was shown to reduce the severity of common bacterial blight during 1987-88 in Tanzania.
  • Use certified disease-free seed.
  • Plant resistant varieties (e.g. French bean variety 'Paulista').
  • Plough under bean debris after harvest.
  • Practise a 2-3 year crop rotation without legumes.
  • Do not work in bean fields when the plants are wet.
  • If blight is observed on scattered plants, spot application of copper hydroxide could be considered.
Minor Pest Position
1
Minor Pest Firstcontent
118
Pest Type
bacterial
Host Plants
Beans