Graduate Studies

 

First Advisor

Amit Jhala

Degree Name

Doctor of Philosophy (Ph.D.)

Department

Agronomy

Date of this Version

11-13-2023

Document Type

Dissertation

Comments

Copyright 2023, Ramandeep Kaur

Abstract

A recent survey reported that Palmer amaranth (Amaranthus palmeri S.Watson) is the number one most difficult to control weed in Nebraska. A survey reported that about 6 million acres in Nebraska are infested with at least one glyphosate-resistant weed. Confirmation and widespread occurrence of atrazine, glyphosate, and ALS-inhibitor-resistant Palmer amaranth in Nebraska is one of biggest concerns for corn producers. Nebraska, the cornhusker state, is one of the leading corn producing states with the production of corn on about 9 to 10 million acres annually; and it ranks 1st in food grade white corn and 3rd in field corn production. Optimum corn yield depends on a number of factors including effective weed management that justify the need to develop management approach for control of multiple herbicide resistant Palmer amaranth. Field experiments were conducted 2020-2021 for assessing control and seed production of multiple herbicide-resistant Palmer amaranth in herbicide resistant and food grade white corn. Chapter 1 outlines Palmer amaranth biology, infestation with corn yield, multiple herbicide resistance and management approaches adopted by growers. Chapter 2 evaluates the herbicide programs for control of multiple herbicide resistant Palmer amaranth in corn resistant to 2,4-d choline/glufosinate/glyphosate (Enlist corn). Chapter 3 determines the effect of plant height on control of multiple herbicide resistant Palmer amaranth in glyphosate/glufosinate resistant corn. Chapter 4 evaluates comparison of residual activity of pre-emergence herbicides for control and seed production of multiple herbicide resistant Palmer amaranth in food grade white corn. Chapter 5 determines the integrative effect of row spacing and herbicide programs for control and seed production of atrazine, glyphosate, and ALS-inhibitor-resistant Palmer amaranth in glyphosate/glufosinate resistant corn. Results of these projects provided guideline for growers for effective management of multiple herbicide-resistant Palmer amaranth in Enlist corn, glufosinate/glyphosate-resistant corn, and food grade white corn.

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