Both insect-vectored viral and fungal diseases are prevalent in Iowa, similar to diseases typical of southern soybean production states. This disease is prevalent in Iowa, especially in western and parts of central Iowa. It is vectored by bean leaf beetles and the upper leaves of infected plants are mottled. Often, this disease is more severe in fields near woody areas where the beetles overwinter. Bean pod mottle virus is also likely to be more severe in earlier planted soybean fields.
Observations indicate that soybean variety makes a difference in disease severity.
If you want to confirm an infection, the ISU Plant Disease Clinic has test kits for diagnosis. In areas where severe disease is observed, take good notes for future management. Although there is not much that can be done this year, several studies on chemical control have shown promising signs. Enlarge Mottled leaves caused by viral infection. This year sudden death syndrome has struck soybeans much earlier.