- Soybean

Soybean Soybean

Bacterial Pustule

Bacteria

Xanthomonas axonopodis pv. glycines


In a Nutshell

  • Light green spots with raised centers appear on both sides of leaves.
  • Pustules develop in the center of spots.
  • Brown irregular necrotic patches form.
  • Patches can fall off and give the leaf a ragged appearance.

Symptoms

Minute, light green specks appear on one or both sides of young leaves. These specks have raised centers and later develop into small light brown or orange pustules, often situated along the leaf veins. At later stages of the disease, they fuse and form large brown irregular lesions, often with a yellow halo. These dead areas can be torn away by wind, giving the leaf a ragged appearance. Small raised spots may also develop on pods. The disease can cause premature defoliation and reduced seed size and quantity.

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Hosts

Trigger

The symptoms are caused by Xanthomonas axonopodis pv. glycines. It is a seedborne bacterium that can also overwinter in crop residues in the soil. It is carried by the wind, water droplets or insects and enters the plant through natural openings or mechanical injuries. The disease rather occurs early in the season, but later infections are also possible. It is promoted by warm and wet weather conditions with frequent showers and wet foliage. Optimal temperature for disease development is in the range of 30-33°C. Potash and phosphorous seem to play an important role in the management of this pathogen.

Organic Control

Sorry, we don't know of any alternative treatment against Xanthomonas axonopodis . Please get in touch with us in case you know of something that might help to fight this disease. Looking forward hearing from you.

Chemical Control

Always consider an integrated approach with preventive measures together with biological treatment if available. Apply copper based fungicides (for example copper oxychloride, 3g/l of water) at an early stage of the disease to ensure the desired effect.

Preventive Measures

  • Plant resistant varieties.
  • Use only pathogen-free seeds.
  • Rotate crops with non-host crops.
  • Avoid injuring plants during field work especially when the foliage is wet.
  • Make sure that your fertilization program includes potash and phosphorous.
  • Maintain good field hygiene.
  • Plough deep after harvest or remove and burn all crop residues.

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