Bacteria, fungi, and watermolds all cause foliar diseases in Ohio, but it is very rare that any management strategies should be deployed mid-season. The primary exception is for frogeye leaf spot, where when disease begins early in the season (growth stage R1 to R3) on a highly susceptible cultivars a fungicide will be required. Yield losses from foliar diseases may occur if more than 50% defoliation occurs early in the season. Again it is rare to see yield losses due to foliar diseases in Ohio. However, this could change as more and more fields continuously crop soybeans.
Find out more about soybean foliar diseases by clicking on the disease name below: