Winter annuals continue to increase as tillage is reduced. Field pennycress, shepherdspurse, horseweed (marestail), chickweed, and others may be present in many fields this spring. Generally, winter annuals do not represent a major threat to corn and soybean production and thus do not require special tactics for control. However, last fall's extended warm temperatures have allowed these weeds to accumulate more biomass than typical. Some fields, particularly in the southern third of Iowa, may benefit from targeted herbicide applications to control these weeds.
Iowa State University
Owen, Micheal D.; Hartzler, Robert G.; and Pringnitz, Brent A., "Managing winter annuals in row crops" (2001). Integrated Crop Management News. 2002.
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