Title

The Effect of Cotton Growth Stage on Injury and Yield Effects When Exposed to Sub-Lethal Concentrations of the Auxinic Herbicides 2,4-D and Dicamba

Issuing Body

Mississippi State University

Advisor

Reynolds, Daniel B.

Committee Member

Dodds, Darrin M.

Committee Member

Mills, J. Anthony

Committee Member

Bond, Jason A.

Committee Member

Jenkins, Johnie

Date of Degree

1-1-2017

Original embargo terms

MSU Only Indefinitely

Document Type

Graduate Thesis - Open Access

Major

Plant and Soil Sciences

Degree Name

Master of Science

College

College of Agriculture and Life Sciences

Department

Department of Plant and Soil Sciences

Abstract

Seed companies have developed novel weed control technologies to combat herbicide-resistant (HR) weeds based on the use of new genetically-modified (GM) crop cultivars and auxin herbicide formulations. These herbicides can variably affect the growth and yield of susceptible cotton even at low concentrations depending on growth stage at exposure. As such, research was conducted in each of two locations in Mississippi in 2014, 2015, and 2016 to determine the cotton growth stage most susceptible to injury and yield effects from simulated misapplications of sub-lethal 2,4-D or dicamba concentrations. Results indicate that generally a decrease in yield partitioned on lower nodes and inner positions was accompanied by a compensatory increase in yield partitioned on vegetative branches and aborted terminals. However, the magnitude of these yield effects differed based on growth stage at exposure and based on which herbicide was used.

URI

https://hdl.handle.net/11668/17816

Comments

dicamba||2||4-D||auxin||cohort||exposure timing||growth stage||maturity||sub-lethal||tank contamination||yield partitioning

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