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Propoxycarbazone-Sodium and Imazapic Effects on Downy Brome (Bromus tectorum) and Newly Seeded Perennial Grasses

Published online by Cambridge University Press:  20 January 2017

Gustavo M. Sbatella ,
Robert G. Wilson ,
Stephen F. Enloe  and
Charlie Hicks
Gustavo M. Sbatella*
Affiliation:
University of Nebraska, Scottsbluff, NE 69361
Robert G. Wilson
Affiliation:
University of Nebraska, Scottsbluff, NE 69361
Stephen F. Enloe
Affiliation:
Department of Plant Sciences, University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071
Charlie Hicks
Affiliation:
Bayer CropScience: Livermore, CO 80536
*
Corresponding author's E-mail: gsbatella2@unl.edu
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Abstract

Vigorous stands of perennial grasses can effectively provide long-term control of many invasive plants on rangelands. However, in degraded conditions, successful reestablishment of perennial grasses can be compromised by invasive annual grasses, such as downy brome. Propoxycarbazone-sodium is a selective herbicide currently labeled for downy brome control in small grains, but its potential use on rangelands is unknown. Studies were conducted from 2004 through 2008 at three rangeland sites in Colorado and Nebraska to evaluate downy brome control and perennial grass injury with propoxycarbazone-sodium and imazapic. Propoxycarbazone-sodium provided satisfactory downy brome control with grass injury equal to or less than imazapic when rainfall followed the fall application. A second set of studies was conducted from 2007 to 2008 at Lingle, WY, and Scottsbluff, NE, to determine the plant-back interval and postemergence application response of seven perennial grass species to propoxycarbazone-sodium and imazapic. Grass tolerance to both herbicides was good when applied 90 and 120 d before planting (DBP). However, grass injury increased as plant-back interval decreased. The greatest impact on plant biomass was observed from herbicide applied at planting or after planting. Crested and intermediate wheatgrass (Agropyron cristatum and Thinopyrum intermedium) biomass production was not affected when herbicides were applied 90 or 120 DBP. Western wheatgrass (Pascopyrum smithii) and Russian wildrye (Psathyrostachys juncea) showed tolerance to imazapic applied before planting. Smooth brome (Bromus inermis), sheep fescue (Festuca ovina), and orchardgrass (Dactylis glomerata) showed the least amount of tolerance to propoxycarbazone-sodium and imazapic.

Keywords

Propoxycarbazone-sodiumimazapicdowny brome, Bromus tectorum L.crested wheatgrass, Agropyron cristatum (L.) Gaertn.intermediate wheatgrass, Thinopyrum intermedium (Host) Barkworth & D.R. Deweyorchardgrass, Dactylis glomerata L.Russian wildrye, Psathyrostachys juncea (Fisch.) Nevskisheep fescue, Festuca ovina L.smooth brome, Bromus inermis Leyss.western wheatgrass, Pascopyrum smithii (Rydb.) Á. LövePerennial forageseedling establishmentmoistureapplication timing
Type
Research
Information
Invasive Plant Science and Management , Volume 4 , Issue 1 , March 2011 , pp. 78 - 86
Copyright
Copyright © Weed Science Society of America 

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References

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