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SW Ontario | Sounds like you had a similar growing season to us in 2018. The problem seems to have so many moving parts it is like trying to nail jello to a wall. The first and biggest problem is testing itself really is not that accurate. While it can be an indicator of higher vom a high test in one load does not guarantee the whole load is bad. Multiple times with the 2018 crop we would deliver a load, test at 10+, bring the load home, take the same load back to same place and would test 1. One bad kernel in a couple pound sample is enough to spike the test. This is what was so frustrating. By July of 2019 most ethanol plants in Ontario magically lifted most restrictions for sub 5 vom and higher stuff had reduced penalties. Best case scenario your area is corn deficit by summer and they ease restrictions.
Cleaning corn had mixed results as well. Essentially the fines contain a higher concentration of VOM but the problem is they are such a small percentage of the total that it did not seem to pull numbers down enough especially when dealing with the real high stuff. Most guys who spent the 10 grand on a cleaner ended up abandoning them after a few loads around us. If you're borderline it may get you down enough to get under the 4 PPM.
As for avoiding it there's some good info by Dave Hooker and Albert Tenuta. Fungicides containing triazoles (in Ontario Proline and Caramba) can help reduce infection by about half. Certain hybrids definitely have better resistance. Reduced tillage and rotation allows increased infection as well. Lots of reading on the subject if you throw their names in google.
https://ontariograinfarmer.ca/2019/03/01/preventing-don-in-corn/
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Getting rid of vomitoxin corn ???
