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  1. Vol. 5 No. 1
     
    Published: May, 2006


    * Corresponding author(s): bradleyke@missouri.edu
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doi:10.1094/CM-2006-0523-01-RS

Influence of Imazamox Rate and Tank-Mix Combinations on Winter Annual Broadleaf Weed Control and Yield in Imidazolinone-Resistant Wheat

  1. Kevin Bradley *a and
  2. Shawn Conleyb
  1. a Division of Plant Sciences, University of Missouri, Columbia 65211
    b Department of Agronomy, Purdue University, 915 West State Street, West Lafayette, IN 47907

Abstract

Four field trials were conducted during the 2003-2004 and 2004-2005 wheat-growing seasons to evaluate the effect of imazamox rate and tank-mix combinations on winter annual broadleaf weed control and yield in imidazolinone-resistant (IR) wheat. Results from these trials indicate that timely fall applications of imazamox will provide good control of henbit and common chickweed in IR wheat, which are some of the most common winter annual broadleaf weeds encountered in many wheat production systems in the United States. No benefit in weed control was observed by increasing the imazamox rate from 35 to 44 or 53 g/ha or by the addition of a thifensulfuron plus tribenuron or 2, 4-D tank-mix combination. Results from these trials also indicate that the addition of a 20% urea ammonium nitrate (UAN) fertilizer solution to imazamox may cause some visual injury to IR wheat and that the addition of 2, 4-D or a 20% UAN fertilizer solution can reduce IR wheat yields compared to applications of imazamox alone.

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