Black seed coat on soybean plants grown in Florida
I recently received seed from plants I had grown in Florida for our winter nursery. We received several individual plants with seeds with tight constricted pods. The seeds in those pods were considerably smaller and covered in black seed coat. As we don't have the rest of the plant to use for identification, only the seeds and shells, it has been much more difficult to identify this disease. Any help would be appreciated.
The beans on the left are from an uninfected plant. Beans on the right are the problem beans.
The beans are spotted or completely black and greatly reduced in size. Plant yield is considerably lower as well, going from around 100 seeds per plant to less than 20.