Hot, Dry Forecast Could Impact the Corn Crop

Hot and dry conditions are expected in many parts of the Midwest in the next seven-14 days as the corn crop enters pollination.

Channel Technical Agronomist Whitney Monin says the long stretch of 90-degree days is a concern for corn.

“When you start talking about mid-90-degree temperatures, that’s when pollen becomes unviable or even becomes sterile, and that’s something that we don’t want to see in terms of pollination,” Monin says.

She says corn yield could be impacted if these conditions continue as forecasted without rain or a drop in temperature.

“Some studies say we lose up to 1% of yield per day, other studies say we lose somewhere between 2%-6% of overall yield per day,” she says. “It’s really going to come down to that temperature combined with if we have adequate moisture reserves in the soils.”

But Monin says lower nighttime temperatures will help.

“We are still going to get those 70-degree reprieves at night, and corn does a tremendous amount of pollination at night,” she says.

She says farmers should keep in mind that the best time to spray corn is between VT and R1. She says fungicide will help lower respiration, preserve silks and ensure good pollination in the warm conditions.

This article originally ran alongside an audio recording on Brownfield Ag News on July 7, 2020. You can find the full article and video at

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