Skip to main content
ARS Home » Research » Publications at this Location » Publication #77375
Title: RELATIVE EMERGENCE SEQUENCE FOR WEEDS OF CORN AND SOYBEAN

Author
item Buhler, Douglas - Doug
item HARTZLER, ROBERT - IOWA STATE UNIVERSITY
item Forcella, Frank
item GUNSOLUS, JEFFERY - UNIVERSITY OF MINNESOTA

Submitted to: Extension Publications
Publication Type: Experiment Station
Publication Acceptance Date: 1/8/1997
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The success of integrated weed management relies on matching control strategies to the specific weed problem in a field. This requires information not only on what weed species and how many of these weeds are present in a field, but also knowledge of the distribution of the weeds throughout the field and the stage of the development of these weeds. Weed control recommendations typically provide information on appropriate tillage methods and herbicide selection. The information concerning weed infestations used to base these recommendations typically is not of sufficient detail to optimize the efficiency of these strategies. Information on weed populations can be improved by increasing the time spent scouting fields. However, time restraints during the busy spring season restrict this opportunity. This problem could be alleviated with an improved understanding of the environmental influences on weed emergence and growth, therefore allowing us to predict when best to invest time in scouting. Armed with greater knowledge of weed development and populations, a person could determine the optimum time for tillage and crop planting to reduce weed populations, maximizing the effectiveness of mechanical weed control operations, and for timing of burndown and postemergence herbicide applications. Although there has been considerable research and modeling of weed emergence in recent years, little effort has been directed toward development of emergence information for persons involved in weed management. This bulletin provides information on how weed emergence timing influences weed management systems. Included are preliminary rankings of relative emergence for important weed species in the Midwest.