Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Ferguson, Jason Connor

Committee Member

Brown-Johnson, Ashli

Committee Member

Reynolds, Daniel B.

Committee Member

Tseng, Te-Ming (Paul)

Date of Degree

12-13-2019

Original embargo terms

Worldwide

Document Type

Graduate Thesis - Open Access

Major

Plant and Soil Sciences (Weed Science)

Degree Name

Master of Science

College

College of Agriculture and Life Sciences

Department

Department of Plant and Soil Sciences

Abstract

Field studies were conducted to test three application methods for applying antagonistic herbicide combinations: 1) tank mix (TMX), 2) mix-in-line (MIL), and 3) separate boom (SPB). Sethoxydim applied with bentazon, glyphosate applied with dicamba or 2,4-D, and clethodim applied with dicamba or 2,4-D had higher efficacy when applied using the SPB method. Antagonism of all the herbicide combinations above was observed when applied using the TMX and MIL methods. In some cases, antagonism was avoided when using the SPB method. Three application methods tested in greenhouse studies were 1) TMX, 2) synthetic auxin applied first (AAF), and 3) synthetic auxin applied second (AAS). The AAS application method resulted in higher weed control than the TMX and AAF methods. Analysis done through liquid chromatography mass spectrometry supported the greenhouse results with higher rates of glyphosate detected with the AAS method.

URI

https://hdl.handle.net/11668/16411

Comments

2,4-D||Dicamba||Herbicide antagonism||Clethodim||Glyphosate||Sethoxydim||Bentazon||Tank mix||Sequential applications||Mix-in-line||Separate boom

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