Soybeans in Columbus county were scouted and observed 60% of the field was affected by browning, yellowing, leaf spot on upper and lower leaves.
Conclusion
The cause of the problem was identified to be soybean downy mildew, caused by Peronospora manshurica. It's a common disease that causes light green to yellow spots. It mostly affects younger leaves, which means it's usually found in the upper canopy and it only seldomly causes yield loss. There are many sources of resistance.
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