That yield boost shows up because pre-emerge residual herbicides provide good weed control well into the critical weed-free period, or the 4 to 7 weeds after planting when corn is most susceptible to weed competition. These residuals also widen the window for a second herbicide pass, which helps out when it rains a lot.
How do you start clean?
Gordon Vail, Syngenta Herbicide Technical Brand Manager, provides technical leadership for the biological development and labeling of corn herbicides for Syngenta. He holds a bachelor's degree in agronomy and a master's degree in weed science from the