Investigation of mixed popultion of Palmer Amaramth & Waterhemp om KY with multiple herbicide resistance
Sustainable Production
AgricultureCrop protectionHerbicide
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
J D Green, University of Kentucky
Co-Principal Investigators:
Erin Haramoto, University of Kentucky
Project Code:
Contributing Organization (Checkoff):
Institution Funded:
Brief Project Summary:

A field site in west Kentucky containing a mixed population of both Palmer amaranth and waterhemp was identified in 2015 that has displayed resistance to both glyphosate and postemergence applications of fomesafen [Flexstar], a prophyrinogen oxidase inhibitor (PPO) herbicide. This field site is unique since mixed populations of Palmer amaranth and waterhemp in the same field are not common. Field and greenhouse trials along with laboratory analysis will be used to investigate the characteristics of this population and to evaluate alternative control strategies that can be used to effectively manage these weeds. The focus of the field study is to evaluate soil-residual and postemergence herbicide...

Unique Keywords:
#weed control
Information And Results
Project Deliverables

This research will increase growers’ awareness of weed species with multiple
sites of herbicide resistance and improve our understanding of herbicide resistant populations of
Palmer amaranth and waterhemp. By having this information, growers and crop advisors will be
in a better position to make informed decisions when developing weed management programs
for these problem weeds. Information will be extended to soybean producers, extension agents,
crop consultants, agricultural retailers, and industry representatives through various mechanisms
including newsletters, meetings and field days.

Final Project Results

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.