Integrated Crop Management News

Document Type


Publication Date



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.

Copyright Owner

Iowa State University



File Format





The Iowa State University Digital Repository provides access to Integrated Crop Management News for historical purposes only. Users are hereby notified that the content may be inaccurate, out of date, incomplete and/or may not meet the needs and requirements of the user. Users should make their own assessment of the information and whether it is suitable for their intended purpose. For current information on integrated crop management from Iowa State University Extension and Outreach, please visit