Full TGIF Record # 278031
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Web URL(s):http://www.wsweedscience.org/wp-content/uploads/WSWS_2016_Proceedings_FINAL.pdf#page=72
    Last checked: 11/17/2016
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Author(s):Curtis, Daniel W.; Roerig, Kyle; Hulting, Andrew G.; Mallory-Smith, Carol
Author Affiliation:Curtis: President-Elect, Local Arrangements, Oregon State University, Corvallis, OR; Roerig: Oregon State University, Corvallis, OR; Hulting: Oregon State University, Corvallis, OR; Mallory-Smith: Oregon State University, Corvallis, OR
Title:Potential use patterns for pyroxasulfone+flumioxazin for grasses grown for seed
Section:Project 3: Weeds of agronomic crops
Other records with the "Project 3: Weeds of agronomic crops" Section
Meeting Info.:Albuquerque, New Mexico: March 7-10, 2016
Source:Western Society of Weed Science Annual Meeting 2016. Vol. 69, 2016, p. 61-62.
# of Pages:2
Publishing Information:Las Cruces, New Mexico: Western Society of Weed Science
Keywords:TIC Keywords: Combination treatments; Diuron; Flumioxazin; Herbicide evaluation; Herbicide injury; Lolium perenne; Poa annua; Poa trivialis; Pyroxasulfone; Seed crops
Abstract/Contents:"Weed seed contamination is the greatest problem confronting grass seed producers. Extensive use of diuron has resulted in diuron resistant Poa annua. Poa trivialis has also become a major problem that producers have been unable to manage with diuron. Pyroxasulfone/flumioxazin has been identified as a potential replacement for diuron in cool season grass seed production in Western Oregon. Studies in 2008 in established perennial ryegrass indicated that pyroxasulfone could be used during the dormant season for preemergent control of grass weeds. In 2009, preemergence applications in established perennial ryegrass and in a carbon seeding study in perennial ryegrass demonstrated that this compound would be a good weed management tool. Marketing strategies have determined that the premix of pyroxasulfone/flumioxazin is the product that would be sold in grass seed production. In 2010-2011 studies, there was good crop tolerance with fall applications in established perennial ryegrass and spring planted tall fescue with this premix. In the established perennial ryegrass study, diuron resistant Poa annua control was 90% with application rates above 0.14 lb ai/A and 90% or greater with rates of 0.10 lb/A in the tall fescue. In 2012-2013, a study was conducted on spring planted tall fescue with a fall application of pyroxasulfone/flumioxazin at 0.14 lb/A. There were no difference in yields between an untreated control and the pyroxasulfone/flumioxazin treatment. The same season a study was conducted on carbon seeded perennial ryegrass with two pyroxasulfone/flumioxazin treatments, 0.10 and 0.14 lb/A. In this study which included populations of Poa trivialis and diuron resistant Poa annua, crop injury was initially 5% at 0.10 lb/A and 14% at 0.14 lb/A. Injury was less than 2 % in June and Poa spp. control was 100 %. Yield was 1192, 1272, and 814 lb/A, for the 0.10, 0.14 and the control respectively. In a study in established tall fescue on a commercial farm in 2012-2013 pyroxasulfone/flumioxazin was applied at 0.10 lb ai/A. There were no differences in yields compared with the untreated control. In 2014-2015 pyroxasulfone/flumioxazin was tested on a carbon seeding of tall fescue in early September. The tall fescue was irrigated through emergence. 62 Pyroxasulfone/flumioxazin rates were 0.10 and 0.14 lb/A. Crop injury persisted into the spring with the 0.14 lb/A treatment. Much of the injury was stand loss and stunting in areas where the irrigation caused standing water. This injury did not affect yield and the 0.14 lb/A treatment had the highest yield in the study. The injury observed in the 0.10 lb/A treatment diminished during the season and yields were greater than the untreated control. In grass seed crops pyroxasulfone/flumioxazin could be used as a preemergence substitute for diuron at rates of 0.10 lb ai/A or less with carbon seeding in the fall for stand establishment. In spring seeded grass seed crops, a preemergence application with pyroxasulfone/flumioxazin at rates of 0.10 - 0.14 lb/A depending on stand vigor, could be made to prevent fall germination of Poa spp. In established grass pyroxasulfone/flumioxazin could be used during dormancy either prior to fall rainfall or in early winter for preemergence control following an earlier preemergence application of another herbicide. Work is currently being conducted with indaziflam at these same application timings which would give growers the ability to rotate modes of action on these perennial grass seed plantings."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Curtis, D. W., K. Roerig, A. G. Hulting, and C. Mallory-Smith. 2016. Potential use patterns for pyroxasulfone+flumioxazin for grasses grown for seed. Proc. West. Soc. Weed Sci. 69:p. 61-62.
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    Last checked: 11/17/2016
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