Full TGIF Record # 308768
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Web URL(s):http://www.wsweedscience.org/wp-content/uploads/WSWS_2019_Proceedings-Final-Version-2.pdf#page=82
    Last checked: 10/18/2019
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Publication Type:
Content Type:Abstract or summary only
Author(s):Curtis, Dan W.; Roerig, Kyle C.; Hulting, Andrew G.; Mallory-Smith, Carol
Author Affiliation:Oregon State University, Corvallis, OR
Title:Tolerance of spring planted tall fescue grown for seed to fall applications of two pyroxasulfone herbicide products
Section:General session: Project 3: Weeds of agronomic crops
Other records with the "General session: Project 3: Weeds of agronomic crops" Section
Meeting Info.:Denver, Colorado: March 11-14, 2019
Source:Western Society of Weed Science Annual Meeting 2019. Vol. 72, 2019, p. 70-71.
# of Pages:2
Publishing Information:Westminster, Colorado: Western Society of Weed Science
Keywords:TIC Keywords: Application timing; Festuca arundinacea; Flumioxazin; Herbicide application; Herbicide evaluation; Herbicide rates; Pendimethalin; Poa annua control; Pyroxasulfone; Seed crops; Seed production
Trade Names:Zidua; Fierce
Abstract/Contents:"Spring planting of tall fescue grown for seed production has become the predominate method for crop establishment. Spring planting takes advantage of rising soil temperatures which reduces annual bluegrass germination in the newly seeded tall fescue crop. The crop forms a crown during the summer and goes dormant as rainfall diminishes in early July. With the onset of rainfall in October and falling soil temperatures, weed management begins. Prior to November 2018, the only fall preemergence herbicide treatment labelled for use in plantings with no prior seed harvest was pendimethalin. Pendimethalin has been shown to be ineffective to prevent germination of Poa species and annual ryegrass in tall fescue. Fierce (pyroxasulfone/flumioxazin) received a label in November 2018 which includes fall applications to spring planted grass seed crops that have at least 8 tillers. The objective of this study was to evaluate crop tolerance of spring planted tall fescue to two pyroxasulfone herbicide products, Zidua (pyroxasulfone) and Fierce, at 1X and 2X rates (pyroxasulfone at 0.098 and 0.195 lb ai/A and pyroxasulfone/flumioxazin at 0.143 and 0.285 lb ai/A) applied in the fall. Pendimethalin treatments at 1X and 2X rates (3.3 lb ai/A and 6.6 lb ai/A) were included for comparison. Applications were made at two fall timings, October 16 and November 20, 2017. The tall fescue growth stage was 2 to 5 tillers at the first application timing. Visual assessments of crop injury and weed control were made at the end of October and mid-November prior to the second application. Assessments were made again mid-December, the end of January and the end of February. The plots were swathed July 5, 2018 and seed was harvested on July 19, 2018. Mid-December evaluations indicated 5 and 10% injury to the tall fescue with the 1X and 2X rates of pyroxasulfone from the October timing. December injury ratings for the pyroxasulfone/flumioxazin were similar to the pyroxasulfone alone with 4 and 14% injury with the lower and higher rates, respectively. February injury observations were 0 and 11% in the early pyroxasulfone treatment and 0 and 4 % with the later pyroxasulfone treatments at the 1X and 2X rates. The pyroxasulfone/flumioxazin resulted in 4 and 11% with the 1X and 2X treatment rates at the early timing and 1 and 5% injury in the 1X and 2X treatments at the later timing in February. Tall fescue in the pendimethalin treatments displayed no injury at either timing. Annual bluegrass at 2 leaf to 1 tiller growth stage was present at the at the time of the October application. Visual control ratings showed both pyroxasulfone products controlling the annual bluegrass 98 to 100 % with the early timing in December. The early pendimethalin treatments were controlled 48 and 85 % of the annual bluegrass in December. February ratings for control of annual bluegrass were 90 and 95% for the early pyroxasulfone, 95 and 98% for the early pyroxasulfone/flumioxazin and 43 and 70% for the early pendimethalin treatment. The late application of the pyroxasulfone controlled 23 and 75% of the annual bluegrass in the 1X and 2X treatments, the late pyroxasulfone/flumioxazin 65 and 80% in the 1X and 2X treatments and the later pendimethalin controlled 5 and 12% in the 1X and 2X treatments. Yield comparison showed no differences between treatments although all herbicide treatment averages were greater than the untreated control. Based on this research pyroxasulfone containing products would provide useful grass weed management in the fall for stands of spring seeded tall fescue."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Curtis, D. W., K. C. Roerig, A. G. Hulting, and C. Mallory-Smith. 2019. Tolerance of spring planted tall fescue grown for seed to fall applications of two pyroxasulfone herbicide products. Proc. West. Soc. Weed Sci. 72:p. 70-71.
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    Last checked: 10/18/2019
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    Notes: Item is within a single large file
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