Full TGIF Record # 231143
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Web URL(s):http://www.wsweedscience.org//wp-content/uploads/proceedings-archive/2013.pdf#page=75
    Last checked: 12/20/2013
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Author(s):Curtis, Daniel W.; Hulting, Andrew; Mallory-Smith, Carol; Roerig, Kyle C.
Author Affiliation:Oregon State University, Corvallis
Title:Advances in control of diuron resistant annual bluegrass (Poa annua) in cool season grasses grown for seed
Section:Weeds of horticultural crops
Other records with the "Weeds of horticultural crops" Section
Meeting Info.:San Diego, California: March 11-14, 2013
Source:Western Society of Weed Science Annual Meeting 2013. Vol. 66, 2013, p. 75-76.
# of Pages:2
Publishing Information:Las Cruces, New Mexico: Western Society of Weed Science
Keywords:TIC Keywords: Application rates; Diuron; Flumioxazin; Herbicide evaluation; Herbicide resistance; Poa annua control; Pyroxasulfone; Research; Seed contamination; Seed production
Abstract/Contents:"Cool season grasses grown for seed are swathed into windrows, allowed to dry and then threshed with a combine equipped with a pick-up header. Weed seeds present in the crop are inherently harvested along with the crop seed in this production system. Oregon seed certification allows contamination of only 0.3% annual bluegrass (Poa annua) seed by weight. Many seed companies have a zero tolerance. Thus, annual bluegrass seed contamination in cool season grass seed production is a major production factor to growers. Diuron has been used to control annual bluegrass which has led to many diuron resistant populations of annual bluegrass. Field experiments were conducted from 2009-2012 to examine weed control efficacy and crop tolerance of grasses grown for seed to pyroxasulfone and flumioxazin. Early January, 2009, treatments of pyroxasulfone applied at 100 g ai/ha and flumioxazin applied at 112 g ai/ha to an established stand of perennial ryegrass with diuron resistant annual bluegrass resulted in control of 90% or greater with pyroxasulfone and 48% with the flumioxazin. Yields were not different than the untreated control. A study initiated in the fall of 2009 documented crop safety and diuron resistant annual bluegrass control with V-10206 (pyroxasulfone) and flumioxazin. V-76 10206 was applied at 59, 119 and 239 g/ha preemergence to diuron resistant annual bluegrass. The diuron resistant annual bluegrass was controlled 90% or greater at all three rates. In this study, a flumioxazin treatment was applied at 70 g/ha and controlled 83% of the diuron resistant annual bluegrass. Yields were not affected by these treatments. Two studies were conducted during the 2010-2011 growing season, one in established perennial ryegrass and one in established tall fescue, with four rates of V-10233, a combination of flumioxazin and pyroxasulfone. V-10233 was applied preemergence to diuron resistant annual bluegrass at 106, 160, 213 and 319 g/ha. In the perennial ryegrass study, diuron resistant annual bluegrass was controlled 90% or greater with the three higher rates of V-10233. In the tall fescue study, V-10233 controlled the diuron resistant annual bluegrass 90% at the lowest rate and 100% at the higher three rates. These studies indicate V-10233 controls annual bluegrass with adequate crop safety in cool season grass seed production."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Curtis, D. W., A. Hulting, C. Mallory-Smith, and K. C. Roerig. 2013. Advances in control of diuron resistant annual bluegrass (Poa annua) in cool season grasses grown for seed. Proc. West. Soc. Weed Sci. 66:p. 75-76.
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    Last checked: 12/20/2013
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