Halo Blight of Beans

Pseudomonas syringae pv. phaseoli

Pseudomonas syringae pv. phaseolicola


A seed borne bacterial disease that causes yellowing and stunting of seedlings growing from infected seed. Small angular spots with a wide yellow green halo appear on leaves in cool weather. In warm weather the halo may not form. Wilting and stunting occur as the bacteria invades the vascular system. On pods greasy or water soaked spots occur and on stems long, green, greasy spots form. A whitish slime may ooze from lesions in humid conditions

Species Affected:

Bean, French Bean and other Phaseolus and legume species.


Spread on seed.

Spread by wind and rain.

Survives on plant debris.

Life Cycle:

Origin and History:



Management and Control:

Plant healthy seed.

Remove and destroy infected plants.

Don't work in wet crops.

Destroy crop residues.

Don't plant legumes on infected soil for 2 years.

Related and Similar Species:




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