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Bacterial Pustule

Bacterial Pustule

Xanthomonas axonopodis


In a Nutshell

    Light green spots with raised centers appear on both sides of leavesPustules develop in the center of spotsBrown irregular necrotic patches formPatches can fall off and give the leaf a ragged appearance

Hosts: %1$s

· Soybean


Minute, light green spots appear on one or both sides of the younger leaves. These spots have raised centers and later develop into small light-colored pustules situated along the leaf veins. At later stages of the disease, these spots fuse and form large brown irregular lesions. 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.


The bacteria overwinters in crop residues or on seeds in the soil. It is carried by the wind, water droplets, and insects and enters the plant through natural openings or mechanical injuries. The disease 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.

Biological 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 at an early stage of the disease to ensure the desired effect.

Preventive Measures

    Plant resistant varietiesUse only pathogen-free seedsRotate crops with non-host cropsAvoid injuring plants during field work especially when the foliage is wetMake sure that your fertilization program includes potash and phosphorousMaintain good field hygienePlough deep after harvest or remove and burn all crop residues