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Web URL(s):http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=103
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Author(s):Perry, D. H.; McElroy, J. S.
Author Affiliation:Auburn University, Auburn, AL
Title:Poa annua response to foliar and root applications of amicarbazone and atrazine
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Meeting Info.:Little Rock, Arkansas: January 25-27, 2010
Source:2010 Proceedings, Southern Weed Science Society. Vol. 63, 2010, p. 53.
# of Pages:1
Publishing Information:Champaign, Illinois: Southern Weed Science Society
Keywords:TIC Keywords: Amicarbazone; Application methods; Foliar uptake; Photosystem II; Poa annua control; Postemergence weed control
Abstract/Contents:"Amicarbazone is a new photosystem II (PSII) inhibiting triazolinone herbicide being evaluated for weed control in certain cool-season turfgrass species. Susceptible plants are reported to exhibit root and foliar absorption with root uptake being predominant. Selective placement studies were conducted in a greenhouse to determine the relative importance of root versus foliar absorption of postemergence-applied amicarbazone in controlling annual bluegrass (Poa annua L.). Annual bluegrass plants were grown in a Cahaba loamy sand (pH - 6.1) to the 3-4 tiller stage. Treatment placements included soil-only, foliar-only, and soil + foliar applications of amicarbazone (0.53 kg ai/ha) and atrazine (2.25 kg ai/ha). All foliar-only and soil + foliar treatments were applied in an enclosed spray chamber at 280 L/ha with 8002E nozzles. For soil-only applications, the appropriate rate of herbicide was diluted in 10 mLs of water and delivered to the soil surface. All herbicide solutions included a 0.25% v/v non-ionic surfactant. Treatments were organized in a randomized complete block design with six replications. Percent control ratings were assigned and photochemical efficiency (Fv/Fm) was measured (0 - 0.83) weekly using a modulated chlorophyll fluorometer. Measurements and ratings were collected 7, 14, and 21 days after application (DAA) at which time shoot clippings were collected, dry mass determined, and calculated as a percentage of the control. Root clippings were collected and processed as previously described 42 DAA. Data for annual bluegrass control and photochemical efficiency was subjected to ANOVA and means were separated using Fisher's protected LSD test (P = 0.05). Annual bluegrass control was similar with amicarbazone and atrazine within each placement. Amicarbazone applied soil-only controlled annual bluegrass 71% 7 DAA, greater than foliar-only amicarbazone applications (33%). Amicarbazone applied soil-only significantly reduced photochemical efficiency compared to foliar-only amicarbazone applications 7DAA. Amicarbazone and atrazine applied soil-only and soil + foliar completely controlled annual bluegrass 21 DAA. Amicarbazone and atrazine applied foliar-only had similar shoot dry weights. Root weights were similar among amicarbazone and atrazine treatments 6 WAA. Although photochemical efficiency was similar among amicarbazone and atrazine for each placement 7 DAA, amicarbazone was lower in all cases and may indicate better efficiency at inhibiting PSII. Results of the selective placement study indicate that root absorption of amicarbazone is beneficial for annual bluegrass control."
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Perry, D. H., and J. S. McElroy. 2010. Poa annua response to foliar and root applications of amicarbazone and atrazine. South. Weed Sci. Soc. Proc. 63:p. 53.
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http://www.swss.ws/wp-content/uploads/docs/2010 Proceedings-SWSS.pdf#page=103
    Last checked: 08/01/2013
    Requires: PDF Reader
    Notes: Item is within a single large file
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