Just an FYI for anyone reading this thread later, I looked at my log from last year. I only grew yellow sweet corn. I bought it from a 5 gallon bucket at the farmer's co-op. I think it might have been Illinois Super Sweet. I planted it May 5 and I began putting mineral oil on the silk July 4 which is about 5 days after silk appears. I began to harvest July 17. So roughly 2 months from planting to tasseling.
I'll record this year's stats for both varieties so I'll know better next time.
Well I just saw on the news that we are due for a double whammy of cicadas this year. The 13 and 17 year broods are both due to emerge this spring. I distinctly remember them 26 years ago when I was building a deck around a new swimming pool. It was deafening. I wonder what effect they will have on my corn.