Farm Progress has published a grower guide on how to test fields for soybean cyst nematode (SCN), refocusing attention on a pest that routinely ranks among the most yield-limiting threats in soybean production.

The guide walks producers through the practical steps of collecting soil samples and getting them analyzed, and it arrives at a point in the season when sampling decisions directly shape next year's variety and seed treatment choices.

Why does testing matter?

SCN operates below ground and often causes yield loss without the visible above-ground symptoms growers rely on to trigger diagnosis. By the time stunting or yellowing appears, the damage is already done. That is the core argument for a proactive, sampling-based approach rather than a reactive one: you cannot manage what you have not measured.

Testing also tells growers whether their current management is working. SCN populations can shift, and resistance packages in soybean varieties do not hold forever. A repeated test on the same field, compared against earlier results, shows whether egg counts are climbing despite resistant varieties — a signal to rotate sources of resistance or change tactics.

What does the guidance cover?

The Farm Progress piece sets out the basics a grower needs before pulling a sample:

• Where and how to collect soil cores so the sample represents the field rather than a single spot
• When sampling fits best into the farming calendar, including post-harvest windows
• How to interpret laboratory results once counts come back
• What the numbers mean for choosing varieties, rotations and other management moves in the following season

What should growers watch next?

Growers who have not tested in recent seasons — or who have relied on the same resistance source for many years — have the clearest case for pulling samples this cycle. The payoff from a single lab analysis is a better-informed decision on variety selection and rotation for the next planting season.

Note: only the headline of the source publication was available at press time; growers should consult the full Farm Progress guide for the specific sampling protocols and thresholds it recommends.