Yellow halos on R1 (beginning flower) soybeans were observed following a heavy wind storm. Leaves damaged by weather are left more susceptible to diseases, like in this case, Bacterial Blight. As symptoms progress, leaves may develop large, irregular dead areas that may fall out, leaving the leaves look tattered.
Conclusion:
Bacterial Blight of soybean is caused by Pseudomonas savastanoi pv. glycinea. While it is generally one of the first foliar diseases to occur on soybean, it rarely contributes to yield loss. Crop rotation with non-host species and tillage may reduce the bacteria's survival. You can learn more about Bacterial Blight of Soybean in this resource from CPN.
