Full TGIF Record # 224962
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Web URL(s):http://www.ncwss.org/proceed/NCWSS-2012-Proceedings.pdf#page=91
    Last checked: 07/17/2013
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Author(s):Brosnan, James; Breeden, Gregory K.; Patton, Aaron J.; Weisenberger, Dan V.
Author Affiliation:Brosnan and Breeden: University of Tennessee, Knoxville, TN; Patton: Purdue University, W. Lafayette; Weisenberger: Purdue University, Lafayette, IN
Title:Zoysiagrass seedhead suppression with imazamox
Other records with the "Foresty/industrial/turf/aqautics/forage/range" Section
Meeting Info.:St. Louis, MO: December 10-13, 2012
Source:67th Annual Meeting of the North Central Weed Science Society. Vol. 67, 2012, p. 91-92.
Publishing Information:Champaign, Illinois: North Central Weed Science Society
# of Pages:2
Keywords:TIC Keywords: Imazamox; Imazapic; Seedhead inhibition; Water soluble fertilizers; Zoysia japonica
Cultivar Names:Zenith; Meyer
Abstract/Contents:"Options for suppressing zoysiagrass (Zoysia spp.) seedheads in managed turfgrass systems are limited and traditional plant growth regulators are ineffective at controlling zoysiagrass seedheads. Experiments were conducted in 2010 and 2011 evaluating the use of imazamox (26, 52, and 70 g ha-1) for Zenith and Meyer zoysiagrass (Zoysia japonica) seedhead suppression and growth regulation compared to imazapic (52 g ha-1) at the University of Tennessee (Knoxville, TN) and Purdue University (West Lafayette, IN). Sequential applications at a 21 day interval of imazamox and imazapic at >= 52 g ha-1 suppressed 'Zenith' zoysiagrass seedheads >= 95% 2 to 6 weeks after initial treatment (WAIT) each year. Slight injury (< 10%) was observed with these treatments; however, effective seedhead suppression resulted in increased green color from 8 to 15 WAIT each year. Relative chlorophyll index values for imazamox and imazapic treated plots ranged from 100 to 147% of the unt reated control in 2010 and 89 to 125% of the untreated control in 2011. On Meyer zoysiagrass, imazamox and imazapic at >= 52 g ha-1 reduced seedhead counts greater than 90% in Tennessee and Indiana. However, significant (>25%) injury was reported with these treatments in Indiana. Additional research was conducted in 2012 evaluating the effects of application timing on Meyer zoysiagrass tolerance to imazamox and imazapic applications for seedhead suppression. Treatments included imazamox (26 and 52 g ha-1) and imazapic (52 g ha-1) alone and in combination with a soluble fertilizer containing nitrogen (15%) and non-chelated iron (6%) at 1.95 kg Fe ha-1. Treatments were applied when 50, 100, 150, and 250 growing degree days (GDD) had been accumulated in Knoxville, TN and West Lafayette, IN. GDDs were calculated using a 10Ā°C base beginning January 1st at each location. An untreated check was included for comparison. Minimal differences in Meyer zoysiagrass injury were detected between application timings in Tennessee. At 21 days after treatment (DAT), injury ranged from 0 to 10% regardless of application timing. In Indiana, applications at 250 GDD were more injurious than other application timings. Injury ranged from 0 to 16%. Injury was accompanied by reductions in green color compared to the untreated check at both locations. Inclusion of nitrogen and non-chelated iron reduced injury and mitigated reductions in color observed with most imazmox and imazapic treatments regardless of application timing. Applications at 100 and 150 GDD suppressed seedheads greater than treatments applied at 50 or 250 GDD in TN. Few applications effectively reduced seedheads in Indiana regardless of ingredient, timing, or iron, which possibly was due to our single application treatment design as previous research with sequential applications effectively reduced seedheads. Inclusion of nitrogen and non-chelated iron reduced seedhead suppression with imazamox (52 g ha-1) and imazapic at all timings in Tennessee. This antagonism from iron was less evident in Indiana although it was evident in an adjacent and related experiment when sequential imazamox applications were made at a 21 day interval. Future research should evaluate environmental parameters trigging zoysiagrass flowering under field conditions to further refine programs and timings for seedhead suppression."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Brosnan, J., G. K. Breeden, A. J. Patton, and D. V. Weisenberger. 2012. Zoysiagrass seedhead suppression with imazamox. Proc. North Cent. Weed Sci. Soc. 67:p. 91-92.
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    Last checked: 07/17/2013
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    Notes: Item is within a single large file
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