​​​Paraquat-Resistant Italian Ryegrass: Not Too Late to Change

March 2022 | 20 min., 04 sec.
by Charlie Cahoon
North Carolina State University
https://doi.org/10.1094/GROW-COT-02-22-332
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Summary

​​Herbicide-resistant Italian ryegrass has long infested North Carolina. In particular, the southern Piedmont has widespread ALS resistance (Osprey and PowerFlex) and spotty ACCase (Hoelon and Axial XL) and glyphosate resistance. For farmers battling Italian ryegrass biotypes that are resistant to glyphosate, ALS, and ACCase herbicides, paraquat is the last line defense for emerged Italian ryegrass. However, paraquat-resistant Italian ryegrass has recently been confirmed in North Carolina. This presentation highlights the importance of avoiding paraquat resistance and potential tactics for managing multiple-resistant Italian ryegrass.

About the Presenter

​​Charlie CahoonCharlie Cahoon is an Extension weed specialist and assistant professor at North Carolina State University. His research focuses on developing innovative and sustainable weed management solutions for corn and cotton. Additionally, at the forefront of his research are management of herbicide-resistant com​mon ragweed, horseweed, Palmer amaranth, and Italian ryegrass and preemptive measures for preventing herbicide resistance. He is also committed to promoting proper stewardship of new herbicide technologies. Cahoon received both his BS and PhD from North Carolina State University. His graduate work was conducted under the direction of Alan York and David Jordan and focused on herbicide-resistant Palmer amaranth management in cotton.​

Contact Information:
Email: charlie_cahoon@ncsu.edu

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