As soybean harvest approaches, farmers have a narrow, high-value window to uncover a hidden yield thief. Soybean cyst nematode (SCN) and other parasitic nematodes can cut yields sharply with no visible symptoms, and fall, right after harvest, is the best time to test soil and find out what’s lurking. To help farmers act on that window, the Soy Checkoffsmis directing growers to the Soybean Nematode Management Guides, a set of science-based tools it helped fund to identify and manage four yield-robbing nematode species.