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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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Sclerotinia and Lygus in Seed Canola: Field Update with George Lubberts, CCA | Enchant, Alberta

Video: Sclerotinia and Lygus in Seed Canola: Field Update with George Lubberts, CCA | Enchant, Alberta

Join Certified Crop Advisor George Lubberts for this Prairie Certified Crop Advisor (Prairie CCA) field update from Enchant, Alberta. In this 12th video of the series, George takes us into a seed canola field where the male rows have been removed and the female plants are filling pods. This video was taken in the third week of August 2025.

George discusses the early signs of sclerotinia stem rot, explaining how infection begins in the stem, impacts pod development, and leads to premature ripening. He also shares insights on lygus bug management, including timing of spray applications to minimize feeding damage and maintain seed size and quality.

With cool, damp summer conditions, George notes that while disease pressure is present, overall field health remains good. The crop is just beginning to show early seed colour change, signaling progress toward maturity.

Topics Covered:

•Sclerotinia stem rot identification and impact

•Managing lygus bugs in seed canola

•Crop stage and seed colour change observations

•Timing insecticide sprays for optimal protection

•Insights from a CCA field perspective in southern Alberta