Theses and Dissertations

Advisor

Bond, Jason

Committee Member

Pieralisi, Brian

Committee Member

Gholson, Drew

Committee Member

Priess, Grant

Committee Member

Allen, Thomas

Date of Degree

8-7-2025

Original embargo terms

Immediate Worldwide Access

Document Type

Graduate Thesis - Open Access

Major

Plant and Soil Sciences (Agronomy)

Degree Name

Master of Science (M.S.)

College

College of Agriculture and Life Sciences

Department

College of Agriculture and Life Sciences

Abstract

The evolution of resistance to many herbicide modes of action (MOA) threatens the utility of synthetic herbicides. Barnyardgrass control in rice has become increasingly difficult due to resistance to common herbicides, and no novel MOA has been introduced in 30 years. FMC Corporation recently discovered tetflupyrolimet (Dodhylex™ active), a Group 28 herbicide that inhibits dihydroorotate dehydrogenase. In 2023 and 2024, studies were conducted at the Delta Research and Extension Center in Stoneville, MS, to evaluate tetflupyrolimet for midsouthern U.S. rice production. The first study evaluated barnyardgrass control and rice tolerance with single and sequential applications of tetflupyrolimet with clomazone and other residuals. The second examined safety across eight rice cultivars. The third tested low rates of tetflupyrolimet and clomazone in four common midsouthern row crops at preemergence and postemergence timings. Tetflupyrolimet improved barnyardgrass control and did not cause injury or yield loss, offering a promising new tool for rice systems.

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