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Cooler, drier conditions mean more caution after planting

With planting season moving at a rapid pace, sprayers will likely be out in full force toward the end of May and early June. The early planting has put some seeds in the ground in cooler conditions, which could pose an early disease threat.

Cooler soils often lead to root rot problems, said Daren Mueller, plant pathologist with Iowa State University Extension. The early planting may result in a slower start for the seed which can lead to gaps between rows along with uneven stands and growth.

“Those are quick signs you might be seeing a problem,” Mueller said. “Anything that looks unusual is worth looking at and paying extra attention too.”

If conditions turn wetter, the threat of disease will increase exponentially, said Tyler Steinkamp, crop protection product manager with WinField United. For those with early soybeans, the biggest issues cold soil temperatures can bring are Pythium and sudden death syndrome.

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Trending Video

Do Cold Temps Impact Emerging Corn & Soybeans? | Pioneer Agronomy

Video: Do Cold Temps Impact Emerging Corn & Soybeans? | Pioneer Agronomy

A cold snap swept across west central Minnesota and eastern South Dakota, bringing frost, fog, and temperatures dipping into the 20s—raising urgent questions about early crop damage.

Pioneer Agronomist Eric Rice breaks down what those overnight temperatures could mean for emerged corn and soybeans, how to assess frost injury, and why patience is key before making any replant decisions. Learn the critical differences between corn and soybean growing points, what cosmetic vs. serious damage looks like, and how last week’s high winds may also be influencing what you’re seeing in the field.

Watch for:

• Frost thresholds for early-season crop damage

• Why corn may be more resilient than it looks

• Soybean growth stages and frost susceptibility

• How to evaluate brittle stems and discolored tissue

• Why waiting 4–5 days before assessing stand loss matters

• When to contact your local Pioneer agronomist or sales representative