Full TGIF Record # 270812
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Web URL(s):http://www.wsweedscience.org/wp-content/uploads/2013/09/WSWS_2015_Proceedings_FINAL_v2.pdf#page=80
    Last checked: 04/11/2016
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Content Type:Abstract or Summary only
Author(s):Curtis, Daniel W.; Roerig, Kyle C.; Hulting, Andrew C.; Mallory-Smith, Carol
Author Affiliation:Oregon State University, Corvallis, OR
Title:Grass weed control with rimsulfuron in cool season grasses grown for seed
Section:General session: Project 3: Weeds of agronomic crops
Other records with the "General session: Project 3: Weeds of agronomic crops" Section
Meeting Info.:Portland, Oregon: March 9-12, 2015
Source:Western Society of Weed Science Annual Meeting 2015. Vol. 68, 2015, p. 80.
# of Pages:1
Publishing Information:Las Cruces, New Mexico: Western Society of Weed Science
Keywords:TIC Keywords: Cool season turfgrasses; Diuron; Herbicide efficacy; Herbicide evaluation; Poa annua control; Poa trivialis; Pronamide; Rimsulfuron; Seed industry; Weed control
Abstract/Contents:"Oregon's seed industry is built on the ability to produce pure seed. For decades, utilization of a narrow band of activated carbon over newly seeded rows has minimized crop injury of a preemergence diuron application while controlling weeds between the rows. However, diuron resistant Poa annua is now found in many grass seed fields in the Willamette Valley. Recently, P. trivialis has emerged as another weed contaminate in seed. Oregon State University studies with rimsulfuron since 2011 have shown a high degree of tolerance in carbon seeded perennial ryegrass to preemergent applications of rimsulfuron. This research has included P. annua and P. trivialis seed obtained from samples provided by area growers. These P. annua and P. trivialis populations have variable susceptibility to rimsulfuron as well as to diuron and pronamide which are registered for use with carbon seeding in grasses grown for seed. In a 2012-2013 carbon seeding study, preemergence applications of rimsulfuron controlled 30% of P. annua and 32% of P. trivialis seedlings. Diuron followed by (fb) ethofumesate controlled 30% of P. annua and 40% of P. trivialis seedlings. Diuron + pronamide fb ethofumesate controlled both species 96% or greater. In a 2013-2014 study, rimsulfuron controlled greater than 90% of both species and diuron + pronamide controlled 75% of the P. annua. Pronamide alone controlled 65% of P. annua and 78% of P. trivialis. Combinations of rimsulfuron with increasing rates of pronamide resulted in greater than 97% control. Yields were not reduced by any of the treatments. Dry conditions slowed growth of P. annua and P. trivialis in this study and then the planting was subjected to a period of very low temperatures (3 F) when the Poa species were at the early tillering stage. In 2014, rimsulfuron was evaluated for fall carbon seeding of tall fescue which must be planted earlier than perennial ryegrass to enable adequate vernalization to occur. Irrigation was used to activate the herbicides and germinate the seed. In this study, early evaluations show control of 75% of P. annua and 90% of P. trivialis with rimsulfuron and 70% control of P. annua and 87% of P. trivialis with diuron + ethofumesate. Rimsulfuron + pronamide provided 94% or greater control of both species, while the diuron + pronamide treatment provided 100% control. In a second study with carbon seeded perennial ryegrass planted three weeks later, rimsulfuron control is 90% of P. annua, an increase of 15% compared to the tall fescue study, and 97% of P. trivialis. Diuron followed by ethofumesate controlled both species greater than 95%, again a substantial increase in control of P. annua. Rimsulfuron + pronamide and diuron + pronamide controlled 100% of the two species. Fall temperatures were mild until a week of low temperatures occurred when Poa species were in the 1 to 2 leaf stage in the perennial ryegrass planting and had several tillers in the tall fescue planting. These two current studies show the variable control that can occur with diuron, pronamide and rimsulfuron. The addition of a low rate of pronamide to the rimsulfuron treatment provided the level of P. annua and P. trivialis control the industry needs. An IR-4 project for rimsulfuron use in grasses grown for seed IR-4 project is nearing completion."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Curtis, D. W., K. C. Roerig, A. C. Hulting, and C. Mallory-Smith. 2015. Grass weed control with rimsulfuron in cool season grasses grown for seed. Proc. West. Soc. Weed Sci. 68:p. 80.
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    Last checked: 04/11/2016
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    Notes: Item is within a single large file
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