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| Any professional will need to look at the whole plant. I would suggest asking an extension agent.
You can try to self-identify it:
https://extension.umn.edu/soybean-pest-management/soybean-seed-and-s...
It can be hard what is the cause, Fusarium will basically open a wound for other stuff to create an attack vector on the plant.
There are 4 different families of microbes that attack or retard fusarium, which is why if you do a shotgun attack like a compost extract, you have a much better chance of having it work.
I also would recommend contacting https://agribiosystems.com/
The owners adam york, and brad holbrock are 5th generation farmers and have 10k acres each of corn and soy, right in the illinois corn belt.
They are supposedly transitioning to 100% organic, non-gmo, but they are still doing traditional tillage.
The three things I noticed from higher Organic Matter in the soil was, it increased water absorption by the soil so no more puddles and drainage issues. Water retention was excellent and back to the plant during dry periods. The moisture stayed in the root zone, long after neighbors corn started curling up. I was still having issues with a large number of pests like cutworms, molds, etc. What I didn't do initially was to balance the microbial population, it didn't autocorrect because it was just gone after so many years.
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Soybeans/ wet soils/ treflan / and seed treatments.
