- Bacterial blight is a common bacterial disease of soybean. It can infect all aerial plant surfaces and is favored by cool, wet conditions.
- Pseudomonas syringae pv. glycinea is a bacterium that also infects snap bean and lima bean. The pathogen overwinters in crop residue and can be seed transmitted.
- Lesions on leaves and pods are easiest to see but can occur on all aerial plant parts.
- Infections begin as small, water-soaked spots that turn yellow ant then brown as the tissue dies. Spots may merge to form dead patches, and the dead tissue may fall out.
- Seedlings may be stunted or killed if apical tissue is infected, and brown lesions may cover much of infected pods.
Time of Occurence
- All seasons
Conditions Favoring Disease
- Cool, wet weather and rainstorms.
- Disease progress stops when conditions become hot and dry.
- The pathogen can be spread by wind and rain in fields, as well as by cultivation when foliage is wet.