Full TGIF Record # 225806
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2009 Proceedings-SWSS.pdf#page=458
    Last checked: 07/25/2013
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i
Report
Author(s):Askew, S. D.; Willis, J. B.; Goddard, M. J.; Mittlesteadt, T. L.
Author Affiliation:Virginia Tech, Blacksburg, VA
Title:Controlling annual bluegrass on greens and fairways with HM9930
Section:Turf and ornamentals
Other records with the "Turf and ornamentals" Section
Meeting Info.:Orlando, Florida: February 9-12, 2009
Source:2009 Proceedings, Southern Weed Science Society. Vol. 62, 2009, p. 388.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Adjuvants; Agrostis stolonifera; Application rates; Golf greens; Herbicide evaluation; Irrigation rates; Native soil greens; Poa annua control; Postemergence weed control
Trade Names:HM9930
Abstract/Contents:"In the past 50 years, annual bluegrass (Poa annua) has been and remains the most troublesome weed of golf putting greens. Only three herbicides are registered for preemergence annual bluegrass control on creeping bentgrass putting greens with one, bensulide, receiving significant use. There aren't any herbicides registered for postemergence annual bluegrass control on creeping bentgrass golf putting greens. HM 9930 is an experimental herbicide under evaluation by Helena Chemical Company for possible use on golf putting greens and fairways. HM9930 controls annual bluegrass postemergence and preemergence without harming creeping bentgrass. In Japan, HM9930 has been marketed for use in turfgrass. Products for golf putting greens in Japan are typically applied at carrier volumes four to five times greater than in the US. Concerns were raised about the need for post application irrigation or adjuvants to improve activity of HM9930. In addition, herbicide rates are unknown for this new product on golf greens in the US. Our objectives were to evaluate effects of irrigation and adjuvant on three rates of HM9930 for annual bluegrass and creeping bentgrass response on sand-based putting greens and native soil fairways in Virginia. Studies were arranged as randomized complete block designs with 3 replications. Plots were 2 x 2 m. Experiments were conducted on a USGA-specification sand-based putting green at the Turfgrass Research Center in Blacksburg, VA, and on golf fairways at Blacksburg Country Club and The Glade Road Research Facility in Blacksburg. At Virginia Tech, both fairway and green trials consisted of L93 creeping bentgrass mown at 13 and 3 mm mowing heights, respectively. Penncross bentgrass was maintained at 15 mm at Blacksburg Country Club. HM9930 was applied at 109, 220, and 328 ml product per ha on the putting green and 220, 328, and 440 ml product per ha on fairways. Treatments were applied April 2 and August 2, 2007 on the green and fairway at Virginia Tech and on March 22 and September 4, 2007 at Blacksburg Country Club. Nonionic surfactant was applied at 0.25% v/v on appropriate treatments. The treatment design was a three by three factorial with a nontreated check as comparison. The first factor was HM9930 rate and the second factor was three levels of additive including none, nonionic surfactant, and post-treatment irrigation at 3 mm 4 hours after treatment. Trials were evaluated for percent annual bluegrass cover and control and creeping bentgrass injury at regular intervals for 1 year. Irrigation and adjuvant did not significantly influence annual bluegrass or creeping bentgrass response to HM9930 at any evaluation date. Normal putting green irrigation probably incorporates the herbicide appreciably negating the need for additional inputs. HM9930 has been reported to be relatively stable in the environment. Rate responses were not significant on golf fairways but all rates reduced annual bluegrass cover 67 to 89% at the golf course fairway and 35 to 65% at the Virginia Tech fairway with no significant differences between rates. On the putting green, increasing rate increased annual bluegrass reduction at 1 year after study initiation. High rates reduced annual bluegrass cover 74 to 84%. HM9930 did not injure creeping bentgrass or cause noticeable symptoms on annual bluegrass at any time during the study."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Askew, S. D., J. B. Willis, M. J. Goddard, and T. L. Mittlesteadt. 2009. Controlling annual bluegrass on greens and fairways with HM9930. South. Weed Sci. Soc. Proc. 62:p. 388.
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http://www.swss.ws/wp-content/uploads/docs/2009 Proceedings-SWSS.pdf#page=458
    Last checked: 07/25/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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