- Bean pod mottle is a common disease in the Midwest. Yield losses can be insignificant to major. This virus can interact with soybean mosaic virus to create severe symptoms.
- Bean pod mottle virus (BPMV) is transmitted by leaf-feeding beetles such as the bean leaf beetle. Seed transmission rates are very low. Host range includes common bean, some clovers, and perennial weeds.
- Green to yellow mottling can be observed on young leaves.
- Leaves may become distorted in severe cases.
- Symptoms are reduced at high temperatures or after pod set.
- Pod formation may be reduced when plants are also under moisture stress.
- BPMV may be associated with green stem syndrome, in which plants retain green stems, and sometimes leaves, after pods and most nearby plants have matured.
Time of Occurence
- All seasons
Conditions Favoring Disease
- Presence of bean leaf beetles that transmit the virus when feeding
- Cool temperatures
- Infection that occurs early in the season
- Note: Virus transmission may be reduced following severe winters that result in poor survival of beetles.
- Effective management tactics are not known.
- Resistant varieties have not been developed.
- The value of insecticides for controlling bean leaf beetle transmission of the virus is uncertain.