Full TGIF Record # 225805
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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2009 Proceedings-SWSS.pdf#page=456
    Last checked: 07/25/2013
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Publication Type:
i
Report
Author(s):Perry, H.; McElroy, S.; Walker, R. H.
Author Affiliation:Auburn Univ., Auburn, AL
Title:The influence of amicarbazone on creeping bentgrass (Agrostis stolonifera) photochemical efficiency
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. 386.
Publishing Information:Champaign, Illinois: Southern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Agrostis stolonifera; Amicarbazone; Application timing; Cultivar evaluation; Herbicide evaluation; Herbicide injury; Poa annua control; Research; Triazolinones
Cultivar Names:Crenshaw
Abstract/Contents:"Annual bluegrass (Poa annua L.) is a problematic cool-season weed on creeping bentgrass putting greens. Both species are C3 grasses and control has proven to be difficult. Putting and aesthetic quality can be compromised due to differences in texture and seed head production posed by P. Annua. Amicarbazone is a new triazolinone herbicide which is currently being evaluated for P. Annua control on creeping bentgrass putting greens. Amicarbazone is a photosystem II inhibiting herbicide which reportedly has controlled numerous monocots and dicots in sugarcane. Root and foliar absorption by target species is possible; however, root absorption is predominant. Research was conducted to evaluate creeping bentgrass phytotoxicity and physiological response to increasing rates of amicarbazone compared to standard rates of paclobutrazol. This study was conducted in the fall of 2007 at the East Tennessee Research and Education Center in Knoxville, TN and repeated in the spring of 2008 at the Auburn University Turfgrass Research Unit in Auburn, AL. The 2007 study was conducted on a Crenshaw creeping bentgrass putting green. Amicarbazone (0.1, 0.2, 0.3, and 0.4 kg ai/ha) and paclobutrazol (0.6 and 1.2 kg ai/ha) was applied once on October 11. All treatments were applied with 0.25% v/v non-ionic surfactant and a non-treated control was included. Treatments were applied to 1 x 1 m plots with a CO2-pressurized backpack sprayer calibrated to deliver 280 L/ha at 138 kPa with 8002VS nozzles. The study was organized in a randomized complete block design with four replications for each treatment. Creeping bentgrass injury was rated on a scale of 0-100% with 0 indicating healthy turf. Ratings were recording weekly for six weeks after treatment (WAT). Photochemical efficiency (Fv/Fm) was measured weekly utilizing a pulse-modulated chlorophyll fluorometer and measurements were standardized relative to the control. Fluorescence measurements were on a scale of 0 to 1 with 1 being optimal. Three readings were recorded for each plot. The 2008 study was initiated on April 2 on G2 creeping bentgrass which was mown daily at 3.2 mm and received 0.18 kg N/93 m2 each month. Both study areas were irrigated to maintain adequate soil moisture. Data for creeping bentgrass injury and photochemical efficiency was subjected to ANOVA (P = 0.05). Means were separated using Fisher's protected LSD test (P = 0.05). In 2007, amicarbazone at 0.4 kg/ha injured creeping bentgrass 54% at 2 WAT. Amicarbazone at 0.3 and 0.4 kg/ha injured creeping bentgrass 16 and 36% 4WAT, respectively. All amicarbazone treatments except the 0.4 kg/ha rate were similar to the control 6 WAT. Paclobutrazol was similar to the non-treated at 2 and 4 WAT and injured creeping bentgrass <= 11% throughout the study. In 2008 similar results were observed at the Auburn, AL location. Amicarbazone injured creeping bentgrass 31 and 35% for the 0.3 and 0.4 kg/ha 2 WAT, and remained injured 26 and 48% 6 WAT. In 2007, amicarbazone decreased Fv/Fm 47, 71, 78, and 77% 1 WAT as rates increased from 0.1 to 0.4 kg/ha. At 0.1 kg/ha, amicarbazone was similar to both paclobutrazol treatments 4 WAT. Fv/Fm was similar among amicarbazone and paclobutrazol treatments 6 WAT. At 0.3 and 0.4 kg/ha, Fv/Fm was reduced <=12% compared to the non-treated. Amicarbazone decreased Fv/Fm in the 2008 study 35, 51, 70, and 73% at 0.1, 0.2, 0.3, and 0.4 kg/ha 2 WAT, respectively. At 0.4 kg/ha, amicarbazone decreased photochemical efficiency >=32% throughout the six-week study. Amicarbazone at 0.1 and 0.2 kg/ha did not decrease Fv/Fm 6 WAT. Further research is needed to investigate lower rates, repeat applications, and timing intervals to further quantify the potential use of amicarbazone."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Perry, H., S. McElroy, and R. H. Walker. 2009. The influence of amicarbazone on creeping bentgrass (Agrostis stolonifera) photochemical efficiency. South. Weed Sci. Soc. Proc. 62:p. 386.
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http://www.swss.ws/wp-content/uploads/docs/2009 Proceedings-SWSS.pdf#page=456
    Last checked: 07/25/2013
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    Notes: Item is within a single large file
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