Date of Graduation

12-2022

Document Type

Thesis

Degree Name

Master of Science in Crop, Soil & Environmental Sciences (MS)

Degree Level

Graduate

Department

Crop, Soil & Environmental Sciences

Advisor/Mentor

Norsworthy, Jason K.

Committee Member

Roberts, Trenton L.

Second Committee Member

Barber, L. Tom

Third Committee Member

Mauromoustakos, Andronikos T.

Keywords

ACCase; Fluazifop; Grain Sorghum; TamArk; Weed Science

Abstract

Herbicide-resistant crops have been commonly used in corn, cotton, and soybean since the 1990s to control numerous different grass and broadleaf weeds. However, this technology has not been available for grain sorghum producers whom have faced challenges controlling grass weeds. Recently a collaboration between the University of Arkansas and Texas A&M University has resulted in a new bred line of grain sorghum, TamArkTM, which is resistant to ACCase inhibitor herbicides which have been previously used to control grass weeds in broadleaf crops. Multiple studies were conducted to determine the sensitivity of TamArkTM and problematic grass weeds to ACCase inhibitor herbicides, and to determine if johnsongrass in major sorghum producing states is resist to new herbicides that could be used in herbicide resistant grain sorghum. It was determined that TamArkTM grain sorghum was not sensitive to ACCase inhibitors from the aryloxyphenoxypropionate and phenylpyrozolin families. These herbicides also resulted in greater than 90% control of problematic grass weeds in grain sorghum. Johnsongrass resistance was found with fluazifop, nicosulfuron, imazamox, and glyphosate but was not deemed widespread.

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