Bacterial Blight and Bacterial Pustule

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Bacterial diseases of soybean have become more common in Ohio in recent years.  When compared with fungal, virus and nematode pathogens, bacterial diseases do not cause significant yield reductions. The most predominant bacterial diseases in Ohio are bacterial blight and bacterial pustule. Symptoms sometimes can be confused with those caused by fungal pathogens, meaning a more detail examination should be conducted if bacterial infection is suspected.

On the left, the underside of a leaf showing symptoms of bacterial pustule. On the right, a leaf with irregular lesions caused by the bacterial blight pathogen.