Date of Award:

8-2022

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Plants, Soils, and Climate

Committee Chair(s)

Corey V. Ransom

Committee

Corey V. Ransom

Committee

J. Earl Creech

Committee

Paul Grossl

Abstract

The invasive mustard species Sahara mustard (Brassica tournefortii), garlic mustard (Alliaria petiolata) and elongated mustard (Brassica elongata) negatively impact a variety of ecological systems across the state of Utah. The distribution of these species in Utah is relatively limited at the current time. If prompt action is taken, it may be possible to contain and manage these species before irreparable ecological and agricultural damage occurs. For this reason, all three mustards are listed by the State of Utah as weeds of high priority for management.

This project tested multiple strategies to determine effective species-specific methods for invasive mustard management. Field and greenhouse experiments compared effectiveness of herbicide combinations, application timings, and physical removal treatments up to five years after initial treatment. For all field trials, final analysis examined how applications reduced cover and densities of invasive mustards as well as the effect on desirable vegetation and long-term impacts. Results provide managers with viable management solutions as well as information concerning unsuccessful treatment methods, future steps, and important considerations when implementing management plans.

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