Didn't they just recently start desiccating with Glyphosate at the end of the growing cycle to speed their harvest up by two weeks and putting glyphosate into food a few days harvesting it (causing a higher concentration in food than previously)?
I have vague recollections of our farm still pulling whites in the early-to-mid 80s, so perhaps not that far back. But that may have simply been a product of our farm being hesitant to try new things, which wouldn't be out of the ordinary. Unfortunately, I was a bit too young at that time to understand the motivation.
In eg Indiana and Iowa the growing season is long enough there's no need to desiccate -- the weather isn't going to turn before the crop has a chance to dry.
Then, e.g. during the cereal growing phase there are regular applications of fungicide, insecticide, growth regulators and so on.
Bottom líne, if you are not buying 100% organic this is the reality of your food chain.
(Full disclosure: I do not buy organic)