Theses and Dissertations

Issuing Body

Mississippi State University

Advisor

Dodds, Darrin M.

Committee Member

Krutz, L. Jason

Committee Member

Irby, J. Trenton

Committee Member

Crow, Whitney D.

Committee Member

Spencer, G. Dave

Date of Degree

8-8-2023

Document Type

Graduate Thesis - Open Access

Major

Plant and Soil Sciences

Degree Name

Master of Science (M.S.)

College

College of Agriculture and Life Sciences

Department

Department of Plant and Soil Sciences

Abstract

Preemergence (PRE) herbicides are used to control weeds and reduce pressure on postemergence (POST) herbicides. However, knowledge of length of control each herbicide provides, as well as the amount of activation rainfall required for adequate weed control, is unknown in Mississippi soybean production. Twenty-one PRE applied soybean herbicides were evaluated for their duration of residual control for five weeks over twelve site years on three weed species from 2021-2022. Some differences in control following herbicide application used on certain weed species were observed at different times. However, most PRE herbicides resulted in adequate (greater than or equal to 90%) control of weed species evaluated up to 35 days after emergence. Also, four PRE herbicides were evaluated in the greenhouse to quantify the amount of rainfall needed for activation when applied to three different soil textures. These data suggest that rainfall recommendations vary by herbicide and soil texture, and some herbicides were effective at controlling weed species at low rainfall amounts (less than 12.7mm).

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