Plants under stress due to environmental factors, such as extreme temperature and moisture are more susceptible to disease, and many were under stress due to the unique environmental conditions in 2019.
Record rainfall during August and continued wet conditions into September are much to blame for the flush of diseases Nebraska’s soybean crop has been experiencing. Here are some of the most common diseases at this time and information on managing them.
Moderate to severe frogeye leaf spot is being reported on soybean in northeast Nebraska. Pathogen resistance to QoI fungicide is suspected in two fields. If you suspect resistance, contact the author for possible testing.
Frogeye leaf spot is occurring in Nebraska soybeans, particularly in the eastern third of the state. While some fields have minor levels, some have significant levels and a fungicide treatment may be needed.