Winter annual weeds have steadily increased in the past decade due to expanding no-till acres. In the majority of Iowa no-till fields, winter annuals do not generate sufficient biomass by planting time to interfere with planting or early-season crop growth. Because of this, our recommendation generally is to control winter annuals with at-planting burndown treatments. If the current dry period continues into the spring, it may be beneficial to control these weeds in March or early April to minimize their use of soil moisture reserves.
Iowa State University
Hartzler, Robert G., "Scout now for winter annuals in no-till fields" (2006). Integrated Crop Management News. 1207.
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 Users are hereby notified that the content may be inaccurate, out of date, incomplete and/or may not meet the needs and requirements of the user.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 https://crops.extension.iastate.edu/.