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Sodium Chloride Salt Applications Provide Effective Control of Sourgrass (Paspalum conjugatum) in Seashore Paspalum Turf

Published online by Cambridge University Press:  20 January 2017

James T. Brosnan ,
Joseph DeFrank ,
Micah S. Woods  and
Greg K. Breeden
James T. Brosnan*
Affiliation:
Weed Science, Department of Tropical Plant and Soil Sciences, University of Hawaii, 3190 Maile Way No. 102, Honolulu, HI 96822
Joseph DeFrank
Affiliation:
Weed Science, Department of Tropical Plant and Soil Sciences, University of Hawaii, 3190 Maile Way No. 102, Honolulu, HI 96822
Micah S. Woods
Affiliation:
Asian Turfgrass Center, 77/1 Moo 3 Bangplee, Bangsai Ayuddhaya, 13190, Thailand
Greg K. Breeden
Affiliation:
Department of Plant Sciences, University of Tennessee, 252 Ellington Plant Sciences Bldg., 2431 Joe Johnson Dr., Knoxville, TN 37996
*
Corresponding author's E-mail: jbrosnan@utk.edu.
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Abstract

Sourgrass is a stoloniferous perennial grassy weed found on golf courses throughout Hawaii. No herbicides are currently labeled for selective control of sourgrass in seashore paspalum turf, a species used regularly on golf courses throughout the tropics. A single granular application of fine salt (99% sodium chloride, 1% sodium silicoaluminate, 83% of particles 0.5 to 0.25 mm in diameter) at a rate of 1,464 kg/ha provided 84 and 23% control of sourgrass 6 wk after initial treatment (WAIT) in 2007 and 2008, respectively. Sequential granular applications of fine salt at 488 kg/ha provided 92 and 96% control of sourgrass in 2007 and 2008, respectively, at 6 WAIT. Granular applications of a coarse salt (100% sodium chloride, 75% of particles 2.0 to 1.0 mm in diameter) provided a lower level of control than fine salt at both the 1,464- and 488-kg/ha rates on three out of four rating dates in 2008; a similar trend was observed in 2007, but no significant differences were observed between these treatments. All salt treatments led to higher soil sodium adsorption ratios (SAR) and electrical conductivity (ECe) than the untreated check; however, levels reported in this study were significantly lower than the threshold SAR and ECe levels that have been associated with reduced seashore paspalum growth. Sequential applications of MSMA at 1.12 kg/ha and MSMA plus metribuzin at 1.12 kg/ha and 0.28 kg/ha, respectively, provided greater than 90% control in 2008, but less than 40% control in 2007. Greater seashore paspalum injury was observed following applications of MSMA and MSMA plus metribuzin than following salt applications. Additional research is needed to evaluate strategies for controlling sourgrass in seashore paspalum turf that do not induce phytotoxic injury after application.

Keywords

MetribuzinMSMAsourgrass, Paspalum conjugatum Berg. PASCOseashore paspalum, Paspalum vaginatum Swartz. PASVAChlorophyll indexchlorophyll metersalinitytoleranceturfgrass
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 23 , Issue 2 , June 2009 , pp. 251 - 256
Copyright
Copyright © Weed Science Society of America 

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