Farmers are worried about their corn crop across the Midwest. Some of it most certainly will need to be replanted because of standing water, but some whole fields have turned yellow.

Farmers don't worry too much about a few very young yellow corn plants in their fields. They do get concerned when every plant is yellow. The problem, in this case, isn't the wet weather says University of Illinois Agronomist Emerson Nafziger…

It's the night time temps that are mostly causing the problems. When those overnight lows are in the 30's, and 40's, it damages the leaf...

The corn should green up once air temperatures return to normal. However, it may be only the new growth that is green says Nafziger. He's not sure if there will be long-term consequences…

The good news, though it is cold comfort says Nafziger, is that any replants that must be done in these yellow fields won't be so very far behind because the standing plants haven't really been growing much.