Weed Control Efficacy and Lint Yield of Herbicide Resistant Cotton Techologies Under Different Tillage Systems and Row Spacing

Introduction Producers utilizing conventional cotton varieties and conventional tillage systems were highly reliant on soil applied preplant incorporated (PPI) or preemergence (PRE) and postemergence (POST) directed spray applied herbicides to achieve adequate weed control; however, due to POST over-the top application ease and control of diverse weed flora by glyphosate and glufosinate used in herbicide resistant cotton varieties, producers have reduced use of these weed control options. Further, the increased adoption of conservation tillage system has reduced the use of preplant incorporated (PPI) and preemergence (PRE) herbicides. However, the decisions related to herbicide resistant technologies may be influenced by a grower’s tillage system. Complex economics are also involved in choosing varieties and subsequent herbicide systems.