Full TGIF Record # 231141
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Web URL(s):http://www.wsweedscience.org//wp-content/uploads/proceedings-archive/2013.pdf#page=74
    Last checked: 12/20/2013
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Author(s):Umeda, Kai; Kopec, David
Author Affiliation:Umeda: University of Arizona Cooperative Extension, Phoenix, AZ; Kopec: University of Arizona, Tucson, AZ
Title:Performance and efficacy of amicarbazone and methiozolin for Poa annua management in desert turfgrasses
Meeting Info.:San Diego, California: March 11-14, 2013
Source:Western Society of Weed Science Annual Meeting 2013. Vol. 66, 2013, p. 74.
# of Pages:1
Publishing Information:Las Cruces, New Mexico: Western Society of Weed Science
Keywords:TIC Keywords: Amicarbazone; Application rates; Application timing; Herbicide evaluation; Poa annua control; Research; Seasonal maintenance
Abstract/Contents:"Amicarbazone at 0.18 and 0.22 lb a.i./A applied in the fall of 2010 initially gave 88 to 90% control, respectively, of P. annua at 2 months after sequential applications. During spring bermudagrass transition, the treated P. annua recovered and control decreased to only 73%. Amicarbazone did not injure perennial ryegrass. During the fall of 2011, amicarbazone at 0.13 or 0.18 lb a.i./A was applied at four different timings after overseeding and then followed with a sequential application at 2 weeks after the initial application. All treatments were applied with a backpack CO2 sprayer equipped with a hand-held boom with three flat fan nozzles. Following sequential applications at 2 to 4 months after overseeding during November 2011 into January 2012, perennial ryegrass was severely injured as high as 56% by amicarbazone at 0.18 lb a.i./A where the sprays in the plots were started and ended. Timings of sequential applications following overseeding provided only as high as 62% control with amicarbazone at 0.18 lb a.i./A. Another identical experiment was initiated but only a single application was made after which severe perennial ryegrass phytotoxicity was observed. At the front and back parts of the sprayed plots, 20 and 30% injury was caused by amicarbazone at 0.13 and 0.18 lb a.i./A, respectively. A third experiment investigated the safety of amicarbazone on perennial ryegrass with and without nonionic surfactant. Amicarbazone at 0.09 and 0.13 lb a.i./A without a surfactant caused less injury at the front and back part of the sprayed plots. Amicarbazone at 0.13 lb a.i./A with a surfactant gave P. annua control that approached an acceptable level at 82% compared to 62% without surfactant Methiozolin at 0.5 lb a.i./A was most efficacious with four applications applied at 10-day intervals during November to December 2011. P. annua control was more effective and complete with only few plants recovering and regrowing. P. annua that was controlled did not create voids in the green's surface as bentgrass filled in gradually. The P. annua control process was gradual from chlorosis to eventual elimination. Spring applications initiated in February or March did not satisfactorily give acceptable control at less than 85% control. During December applications, P. annua did not exhibit any symptoms until weeks after the fourth application of methiozolin. Spring applications exhibited chlorotic symptoms following the third application at 10-day intervals. Bentgrass was relatively safe and only showed slight discoloration."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Umeda, K., and D. Kopec. 2013. Performance and efficacy of amicarbazone and methiozolin for Poa annua management in desert turfgrasses. Proc. West. Soc. Weed Sci. 66:p. 74.
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    Last checked: 12/20/2013
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