Full TGIF Record # 309936
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Web URL(s):http://www.wsweedscience.org/wp-content/uploads/WSWS_2017_Proceedings_FINAL.pdf#page=21
    Last checked: 01/10/2020
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Fronk, Natalie; Ransom, Corey V.; Olsen, Heather E.
Author Affiliation:Utah State University, Logan, UT
Title:Comparing residual herbicides for annual grass control
Section:Poster session
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Project 1. Weeds of range and natural area
Other records with the "Project 1. Weeds of range and natural area" Section
Meeting Info.:Coeur d'Alene,Idaho: March 13-17, 2017
Source:Western Society of Weed Science Annual Meeting 2017. Vol. 70, 2017, p. 8-9.
# of Pages:2
Publishing Information:Westminster, Colorado: Western Society of Weed Science
Keywords:TIC Keywords: Annual grasses; Bromus japonicus; Bromus tectorum; Glyphosate; Herbicide application; Herbicide combinations; Herbicide evaluation; Imazapic; Indaziflam; Propoxycarbazone-sodium; Rimsulfuron; Taeniatherum caput-medusae
Abstract/Contents:"Indaziflam is a relatively new alkylazine herbicide labeled for weedy broadleaf and grass management in orchards, vineyards, commercial turf, roadsides, and non-grazed range and forest. However, it is not currently labeled for grazed rangeland and pasture. Recent studies have found indaziflam to be an effective herbicide on rangeland annual grasses such as downy brome and superior to other annual grass herbicides such as imazapic, rimsulfuron, and glyphosate (Sebastion et al. 2016). The purpose of this study was to compare effects of combinations of indaziflam with various herbicides, including propoxycarbozone, glyphosate, imazapic, and rimsulfuron on the winter annual grasses medusahead (Taeniatherum caput-medusae), downy brome (Bromus tectorum), and Japanese Brome (Bromus japonicus). Some treatments were evaluated at both preemergence and postemergence application timings. Studies were established at one brome site and one medusahead infested site in Northern Utah. Treatments were applied with a CO2-pressurized backpack sprayer calibrated to deliver 234 l/ha at 276 kPa pressure. Fall applications were made in November of 2015 and spring applications in April of 2016. Injury and annual grass control were evaluated visually and cover data was collected utilizing point-line transects. Propoxycarbozone provided minimal control of Japanese brome and medusahead, and cover of both species was not different from the untreated control by fall 2016 in both trials. Glyphosate and imazapic provided moderate control in early summer but had high covers of winter annual grass by the fall. Imazapic applications rates were likely too low for the higher rainfall experienced in the treated area. For the treatments applied both fall and spring, spring applications tended to damage desirable grasses more than fall applications, with spring applications of rimsulfuron alone and rimsulfuron with indaziflam causing among the highest desirable grass injury (55 to 94%). Of the fall applications rimsulfuron and indaziflam combinations caused the most damage to desirable grasses (81 to 93%). However, desirable grass cover in October 2016 was not different among treatments in the brome trial. In November, desirable grass cover was greater than the untreated for all treatments in the medusahead trial with the exception of propoxycarbazone alone at both application timings and rimsulfuron plus indaziflam applied in the spring. In October, treatments containing indaziflam had among the least Japanese brome cover. Likewise, all treatments containing indaziflam had among the least medusahead cover at the November evaluation. While some of the treatments evaluated had very high levels of grass injury, fall grass cover was not negatively affected. The long-term suppression of annual grasses with indaziflam, with transitory injury to perennial grasses, provides an option for protecting and reclaiming perennial grass stands from annual grass invasion."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Fronk, N., C. V. Ransom, and H. E. Olsen. 2017. Comparing residual herbicides for annual grass control. Proc. West. Soc. Weed Sci. 70:p. 8-9.
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    Last checked: 01/10/2020
    Requires: PDF Reader
    Notes: Item is within a single large file
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