By Andi Anderson
Waterhemp, a fast-spreading weed, is posing a major challenge to soybean farmers in Illinois due to its increasing resistance to Group 15 herbicides. A research team from the University of Illinois is now in its second year of studying this issue. The project is led by graduate student Travis Wilke under the guidance of weed scientist Dr. Aaron Hager.
The study aims to screen waterhemp populations from soybean fields across the state. The researchers are assessing resistance levels and developing better strategies to manage this weed using Group 15 herbicides.
In the first year, their findings were presented to over 250 farmers, agronomists, and scientists at meetings like the North Central Weed Science Society Annual Meeting, the CCA Annual Meeting, and the Field Advisor Forum. These events helped raise awareness and encouraged discussions on how to tackle herbicide resistance.
In the second year, the research team started screening on March 3, with a focus on the herbicide S-metolachlor. The screenings are set to be completed by the end of April.
The researchers are comparing waterhemp populations from different fields to identify which ones show resistance and which do not. They are also testing other Group 15 herbicides to confirm resistance levels more accurately.
One major goal of this year’s study is to identify the exact genes responsible for metabolism-based resistance in waterhemp. Understanding these genes could help develop future herbicide options or alternative control methods.
This study is important because it supports soybean farmers with science-based recommendations to improve weed control and reduce crop losses. The results of the ongoing research will help farmers make more informed choices in their weed management programs.
It also contributes to the wider understanding of herbicide resistance and its impact on agriculture.
Photo Credit: gettyimages-zoran-zeremski
Categories: Illinois, Crops, Soybeans