The number of Iowa fields with winter annual weed infestations continues to increase as more fields are maintained in no-till systems. The lack of data documenting the impact of winter annuals on crop establishment and crop yield complicates determining how to best manage this group of weeds. Currently, growers are faced with the decision to spray an infested field as soon as conditions allow or to wait to kill the winter annuals at planting.
Iowa State University
Hartzler, Robert G., "Spring management of winter annual weeds in no-till" (2007). Integrated Crop Management News. 1105.
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