Comparing the Efficacy of Non-Selective Alternative Herbicides in New Mexico and Western Oregon
Applied Research
Leslie Beck
Extension Weed Specialist
NMSU Extension Plant Sciences
Las Cruces
Abstract
Suppressing weeds in an urban landscape is becoming more challenging for landscape managers who work in areas where pesticide restrictions occur, and established vegetation must be eradicated without the use of traditional herbicide chemistries. To remain in compliance with these restrictions, the use of non-selective alternative herbicide active ingredients has been utilized in these weed control programs; however, there is limited research evaluating the actual efficacy and feasibility of these alternative herbicides in real-world applications. In 2022, field studies were conducted in Las Cruces, NM and Corvallis, OR to evaluate the efficacy of repeated applications of 10 alternative contact herbicides that conform to current and proposed municipal legislation in New Mexico and Oregon to provide better-management information to stakeholders for the use of these products in landscape systems. Results of this research indicated that all herbicide treatments provided effective broadleaf weed control in both Las Cruces and Oregon locations, with the exception of 5% mint oil + 5% sodium lauryl sulfate + 5% potassium sorbate treatments. However, repeated applications of all treatments were necessary to maintain extended control beyond herbicide injury symptoms observed following the initial application. In Las Cruces, NM, herbicide treatment injury reduced the density of monocots (both turfgrass and grassy-weeds) with repeated applications of 70% d-limonene, 7.5% sodium chloride, and 57% pelargonic acid treatments only. However, bermudagrass, which was the primary turfgrass located within the research area in Las Cruces, fully recovered within a month of the final herbicide treatments. As a result, alternative herbicides may be a useful tool for weed control in landscape systems; however, IPM practices are still required for successful and sustainable weed management since both weeds and the turfgrass eventually recovered in both locations regardless of treatment.
Poster has NOT been presented at any previous NACAA AM/PIC
This poster is being submitted for judging. It will be displayed at the AM/PIC if not selected as a State winner. The abstract will be published in the proceedings.
Click to view Poster
Authors: Leslie Beck
-
Beck, L. Extension Weed Specialist, , New Mexico, 88003