Source: Kevin Bradley, University of Missouri

Winter annual weeds like henbit, purple deadnettle and chickweed are already emerging in many corn and soybean fields throughout Missouri, and as corn and soybean harvest is underway, many growers are once again asking about the utility of fall herbicide applications.

Research indicates that applications of residual herbicides made in early March (or sometime similar in the early spring) can provide the same level of winter annual weed control as applications of these same herbicides in the fall. In addition, University of Missouri data indicate that early spring applications of residual herbicides provide better control of emerging summer annual weed seedlings than fall herbicide applications.

Original press release