Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Shaw, David R.

Committee Member

Byrd, John D.

Committee Member

Massey, Joseph H.

Committee Member

Koger, Clifford H.

Date of Degree

12-15-2012

Document Type

Graduate Thesis - Open Access

Major

Weed Science

Degree Name

Master of Science (M.S.)

College

College of Agriculture and Life Sciences

Department

Department of Plant and Soil Sciences

Abstract

In field efficacy trials most glyphosate/surfactant combinations tested control barnyardgrass as well as preormulated glyphosate products 21 days after treatment (DAT). Preormulated glyphosate products controlled barnyardgrass quicker than combination treatments, most likely due to improved glyphosate formulations with improved surfactant systems. In greenhouse trials, preormulated glyphosate products exhibited greater fresh weight reductions across all species tested, including barnyardgrass, broadleaf signalgrass, hemp sesbania, johnsongrass, large crabgrass, pitted morningglory, prickly sida, sicklepod, yellow foxtail and Palmer amaranth. Nonionic tallow amine treatments exhibited variable control among species. A shikimate analysis was developed using non-glyphosate-tolerant soybean to estimate efficacy of surfactants; data were then correlated to the visual efficacy data on barnyardgrass in the field. However, there was not sufficient variability in barnyardgrass control to use the shikimate analysis as a predictor.

URI

https://hdl.handle.net/11668/19676

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