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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=101
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Author(s):Post, A. R.; Jester, J. L.; Askew, S. D.; Norton, L.; Spak, D.
Author Affiliation:Post, Jester and Askew: Virginia Tech, Blacksburg, VA; Norton and Spak: Bayer Environmental Sciences, Clayton, NC
Title:Turfgrass response to indaziflam
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Meeting Info.:Little Rock, Arkansas: January 25-27, 2010
Source:2010 Proceedings, Southern Weed Science Society. Vol. 63, 2010, p. 51.
# of Pages:1
Publishing Information:Champaign, Illinois: Southern Weed Science Society
Keywords:TIC Keywords: Activated carbon; Application rates; Cultivar evaluation; Cynodon dactylon; Dithiopyr; Festuca arundinacea; Herbicide evaluation; Herbicide resistance; Indaziflam; Lolium perenne; Pendimethalin; Poa pratensis; Preemergence herbicides; Prodiamine; Turfgrass quality; Weed control; Zoysia japonica
Trade Names:Turf Builder; Specticle; Barricade; Dimension; Ronstar; Pendulum
Abstract/Contents:"Indaziflam is a new preemergence herbicide soon to be registered for use in fine turf, ornamentals and industrial vegetation management. It is a cellulose biosynthesis inhibitor that has preemergent and limited postemergent activity to control annual weeds at low use rates. The turfgrass registration, under the trade name Specticle, will allow use on warm season turfgrass beginning early in 2010. Tolerance to cool season grasses has been variable and only warm season grasses are on the Specticle label. Our objective for this study was to evaluate turfgrass tolerance to indaziflam for three common cool season grasses and two warm season grasses in Virginia. Six trials conducted in Blacksburg VA in 2007 evaluated turfgrass tolerance to indaziflam. All experiments were randomized complete block designs with three replications. Tall fescue (Schedonorus phoenix (Scop.) Holub.), perennial ryegrass (Lolium perenne L.), Kentucky bluegrass (Poa pratensis L.), bermudagrass (Cynodon dactylon (L). Pers.), and zoysiagrass (Zoysia japonica Steud.) were evaluated for indaziflam tolerance. Seven rates of indaziflam were evaluated including 25, 50, 75, 100, 150, 200 and 300 g ai/ha. These indaziflam treatments were evaluated against the industry standards of prodiamine (Barricade), dithiopyr (Dimension), oxadiazon (Ronstar), pendimethalin (Pendulum), and pendimethalin (Turf Builder with Haltz), at labeled rates and a nontreated check. These experiments were initiated in April and May 2007. Two studies examined Kentucky bluegrass and perennial ryegrass tolerance to indaziflam with and without the use of an experimental safener. These two trials were initiated in June 2007 and included treatments of indaziflam at 40 and 80 g ai/ha with two rates of an experimental safener as well as a safener only application and a nontreated control. Activated charcoal was also applied to these plots in strips, to evaluate its effects on indaziflam injury to turfgrass seedling establishment. For the tolerance trials, only the highest rate of indaziflam caused noticeable injury to zosiagrass, and zoysia was more tolerant than bermudagrass. Zoysia and bermudagrasses tolerate indaziflam well even at high rates; however, as expected, cool season grasses are not as tolerant. At the three highest rates of indaziflam, perennial ryegrass is susceptible to carryover when over-seeding in the same year. Higher rates of indaziflam cause unacceptable injury to Kentucky bluegrass with the four highest rates injuring turf 38% or more. Indaziflam also injures tall fescue at 35% or more at the highest three rates by 28 days after treatment. Based on this research, a rate of 150 g ai/ha could be considered a 2X safety margin as this rate had minimal effects on bermudagrass grow-in and fall establishment of perennial ryegrass and half this rate was enough to control weeds. The rate for zoysia can be increased without injuring turf, but with potential to affect perennial rye when overseeded in the same year. Kentucky bluegrass is injured by all but the lowest rates of indaziflam and its use in Kentucky bluegrass should be limited to rates of no more than 40 g ai/ha. Tall fescue can be treated with a rate 75 g ai/ha while still avoiding significant turf injury but stress tolerance may be reduced at this rate of indaziflam. For tolerance trials using the safener: Kentucky bluegrass plots receiving the safening agent seemed to have higher turf quality, but results were inconsistent. For perennial ryegrass, at the 40 g ai/ha rate, the safener improved turf quality significantly compared to the nontreated control; however, the 80 g ai/ha rate was too injurious to observe a safening effect. Activated charcoal applied in a band to seeded perennial ryegrass plots significantly increased seedling emergence and improved turf quality. Plots treated with 80 g ai/ha had zero seedling emergence where no charcoal was applied. Based on these results the safener can be used to improve turf quality in cool season turfgrasses treated with indaziflam at rates at or below 40 g ai/ha and activated charcoal could be applied prior to perennial ryegrass over-seeding to improve seedling emergence and establishment."
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Post, A. R., J. L. Jester, S. D. Askew, L. Norton, and D. Spak. 2010. Turfgrass response to indaziflam. South. Weed Sci. Soc. Proc. 63:p. 51.
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http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=101
    Last checked: 07/31/2013
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    Notes: Item is within a single large file
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