It is that time of year when twisted whorls and yellow leaves are making an appearance in corn fields across the state. This is commonly referred to by many names, regardless, it is nothing to be overly concerned about unless it is very prevalent in your fields.
High prevalence could be related to growth regulator herbicides or even a hybrid with a higher tendency for occurrence. Wait a couple days with sunlight and a little wind and you’ll hardly notice it even existed.
Here is more information on rapid growth syndrome.