Timing your corn plantings to stop cross pollination can run into a problem also just by the weather.
Here in Washington State I've had times where I planted and they been growing for about three weeks so I plant the other kind only to run into a cold time for a while and the first one slows way down. Then good weather happens and it seems like the newly planted ones take off almost catching up with the first ones.
I've only ran into the problem a few times over the years.
Never heard about deer eating corn before.
Here the only damage I get is the lazy deer walking through my corn rows to get to my raspberries and tomatoes.
I'm hoping to get a fence up this year.
My dog to old now to keep the deer out.
Before the deer wouldn't come in my yard.
Last few years they know he barks and that's about it. LOL!
It doesn't help with a lot of neighbors feeding the deer.
They no longer fear humans.
GRRRRRRRRRRRRRRRRRRR!!!
Rant on! I've been known to go on deer rants, dog rants, neighbor rants, so on and so forth, so jump right in!
Corn is so tricky! I've known the cold to slow them down germinating...and not enough fertilizer maybe and they don't grow fast. So much to factor in. They say plant at least 14 weeks apart, but I always go one month between just to be on the safe side.