The Layered Approach: Why Residuals Matter in Corn & Soybeans

Harvest isn't just about measuring what happened this year—it's an opportunity to start planning for the next crop. Dr. Sherder says changing planting dates, cover crops and tillage practices make weed-control planning increasingly important. In soybeans, his message remains consistent: start with multiple effective modes of action in the pre-emerge program, then follow with multiple post products and another residual to keep weeds from gaining a foothold.

Waterhemp is a major reason to think beyond a single season. Saving a few dollars by relying on one mode of action may look attractive today, but surviving weeds can replenish the seedbank and create a more expensive problem for years to come. In corn, Dr. Schroeder recommends the same basic philosophy: identify the primary weed pressure, start strong with multiple effective modes of action and residual activity, and layer the post-emerge program rather than relying on a single pass. 

The conversation also addresses the renewed interest in conventional corn. Dr. Schroeder explains that growers still have strong herbicide options without glyphosate, but the system leaves less room for rescue treatments if the initial program fails. He also reminds conventional corn growers to pay attention to insect pressure—particularly European corn borer—because any grain premium can disappear quickly if yield suffers.

Finally, don't let the combine cab become autopilot. Use harvest to scout fields, identify why certain areas underperformed, and document weed escapes or drowned-out areas that could become major problems next season. Dr. Schroeder cautions against completely changing a program based on one unusual year; instead, evaluate whether what you learned holds true across multiple seasons. Start with a good plan, understand why you're making each decision, and be prepared to adjust when conditions throw a curveball.

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