Marestail (Conyza canadensis) is one of the most difficult weeds to manage in no-till soybean. While classified as a winter annual, the plant has significant emergence in both late summer/early fall and in the spring. This extended emergence period greatly complicates management since the success of postemergence products is closely tied to plant size. Attempting to control populations at the time of planting often results in control failures as fall-emerged plants are too large for acceptable control.
Iowa State University
Hartzler, Bob and Anderson, Meaghan, "Fall Marestail (Horseweed) Management" (2017). Integrated Crop Management News. 2474.
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