Full TGIF Record # 308763
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Web URL(s):http://www.wsweedscience.org/wp-content/uploads/WSWS_2019_Proceedings-Final-Version-2.pdf#page=22
    Last checked: 10/18/2019
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Beckley, Cody J.; Ransom, Corey V.
Author Affiliation:Utah State University, Logan, UT
Title:Herbicide application timing influences invasive annual grass control
Section:Poster session: Project 1. Weeds of range, forest, and natural areas
Other records with the "Poster session: Project 1. Weeds of range, forest, and natural areas" Section
Meeting Info.:Denver, Colorado: March 11-14, 2019
Source:Western Society of Weed Science Annual Meeting 2019. Vol. 72, 2019, p. 10.
# of Pages:1
Publishing Information:Westminster, Colorado: Western Society of Weed Science
Keywords:TIC Keywords: Bromus tectorum; Herbicide application; Herbicide efficacy; Herbicide evaluation; Herbicide timing; Herbicide trials; Imazapic; Indaziflam; Invasive weeds; Rimsulfuron; Taeniatherum caput-medusae; Weed control
Abstract/Contents:"Medusahead (Taeniatherum caput-medusae) and downy brome (Bromus tectorum) are highly competitive invasive winter annual grasses which pose a major threat to native rangeland ecosystems of the continental United States. Preemergence herbicide applications can be an effective control method, but efficacy is highly influenced by application timing. Previous research on medusahead has indicated that applications made in October and November were generally more effective than applications made in August or September. It was thought this was due to better foliar uptake and activity and compared to soil activity against germinating seedlings. Two separate trials were initiated in 2017 on rangelands to evaluate early preemergence and postemergence herbicide application timings for impact on medusahead and downy brome control. Treatments for medusahead consisted of indaziflam, indaziflam + rimsulfuron, and imazapic applied at different timings to plots measuring 3 by 9 m arranged in a randomized block design, replicated four times. Treatments for downy brome consisted of indaziflam and indaziflam + rimsulfuron applied at different timings in a similar randomized block design. When considering preemergence suppression of medusahead, indaziflam and imazapic treatments applied in July were more effective than the same treatments made in August. The indaziflam + rimsulfuron was similarly effective for all application timings. When considering suppression of downy brome, indaziflam treatments made in July were similar to the November timing. Both timings were more effective than none, but not at a commercially acceptable level. When comparing percent cover, the November application of indaziflam + rimsulfuron was more effective at controlling downy brome than the same combination applied in July. However, both applications were similar when comparing downy brome dry weights. The results of these trials suggest that earlier application timings of indaziflam can be effective for control of highly competitive invasive annual grasses if the herbicide is moved off the thatch layer and into the soil at depths where germination is occurring. If applied after germination, indaziflam requires the addition of herbicide with foliar activity to maximize control. Future research which evaluates interaction between early herbicide applications, thatch depth, soil qualities, and rainfall should be considered."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Beckley, C. J., and C. V. Ransom. 2019. Herbicide application timing influences invasive annual grass control. Proc. West. Soc. Weed Sci. 72:p. 10.
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http://www.wsweedscience.org/wp-content/uploads/WSWS_2019_Proceedings-Final-Version-2.pdf#page=22
    Last checked: 10/18/2019
    Requires: PDF Reader
    Notes: Item is within a single large file
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