Theses and Dissertations

ORCID

0000-0002-4190-5733

Issuing Body

Mississippi State University

Advisor

Bond, Jason A.

Committee Member

Allen, Thomas W., Jr.

Committee Member

Reynolds, Daniel B.

Committee Member

Barapour, Taghi M.

Committee Member

Dodds, Darrin M.

Date of Degree

8-9-2022

Document Type

Dissertation - Campus Access Only

Major

Plant and Soil Science

Degree Name

Doctor of Philosophy (Ph.D)

College

College of Agriculture and Life Sciences

Department

College of Agriculture and Life Sciences

Abstract

With the adoption of the Xtend® technology growers began to report reduced control levels of weedy grasses when applying tank-mixes of glyphosate and dicamba. Therefore, research was conducted at the Delta Research and Extension Center in Stoneville, MS from 2019 to 2021 to examine influence of herbicide mixtures with dicamba, as well as carrier volume and nozzle type. Results indicated barnyardgrass control 14 and 28 DAT was greatest with glyphosate alone. Control was not different when DGA or BAPMA dicamba or 2,4-D choline were mixed with glyphosate. At 28 DAT, barnyardgrass control was 15 to 18% lower with herbicide mixtures compared with glyphosate alone. Barnyardgrass control with glyphosate plus dicamba was not decreased by drift-reducing nozzles. Carrier volume of > 94 L ha-1 provided greater control of barnyardgrass compared to 47 L ha-1. These results indicate potential of reduced barnyardgrass control with glyphosate plus dicamba.

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