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Tolerance of Four Seashore Paspalum (Paspalum vaginatum) Cultivars to Postemergence Herbicides

Published online by Cambridge University Press:  12 June 2017

B. Jack Johnson  and
Ronny R. Duncan
B. Jack Johnson
Affiliation:
Crop and Soil Science, University of Georgia, Georgia Station, 1109 Experiment St., Griffin, GA 30223-1797
Ronny R. Duncan
Affiliation:
Crop and Soil Science, University of Georgia, Georgia Station, 1109 Experiment St., Griffin, GA 30223-1797
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Abstract

A field study was conducted on tolerance of four seashore paspalum cultivars to postemergence (POST) herbicides in Georgia during 1995 and 1996. Quinclorac (0.8 kg/ha) and MON 12000 (0.07 kg/ha) at recommended rates were the only POST herbicides that did not affect the performance of any seashore paspalum cultivar (≥ 89%). When the rates were increased to three times recommended, the quality of ‘AP 10’ (≥ 96%) and ‘PI 28960’ (93%) cultivars was not affected, but the quality of ‘HI 25’ (≥ 84%) and ‘K-7’ (77%) was lower when compared with respective untreated plots. HI 25 recovered within 4 wk, but K-7 required 6 wk or longer. Dicamba at 1.7 kg/ha affected the quality of K-7 (69%) more at 2 wk than the other cultivars (85 to 92%). Diclofop, imazaquin, and 2,4-D plus mecoprop plus dicamba significantly reduced the quality of all cultivars 2 wk after treatment (WAT). The quality of all cultivars was similar at 2 WAT with diclofop at 1.1 kg/ha (79 to 84%). However, when treated with imazaquin at 0.4 kg/ha, the quality of K-7 (65%) was lower than AP 10 (85%), HI 25 (77%), and PI 28960 (81%), and when treated with 2,4-D plus mecoprop plus dicamba at 1.1 + 0.6 + 0.1 kg/ha, the quality of AP 10 (75%), PI 28960 (72%), and K-7 (57%) was lower than HI 25 (87%). POST applications of quinclorac, dicamba, and MON 12000 were safe to use for weed control in paspalum cultivars, whereas the safety of diclofop and imazaquin was marginal, and 2,4-D plus mecoprop plus dicamba was unacceptable.

Keywords

Dicamba, 3,6-dichloro-2-methoxybenzoic acid: diclofop, (±)-2-[4-(2,4-dichlorophenoxy)phenoxy] propanoic acidMON 12000, methyl 5-[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonylaminosulfonyl]-3-chloro-1-methyl-1-H-pyrazole-4-carboxylateimazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidmecoprop, (±)-2-(4-chloro-2-methylphenoxy) propanoic acidquinclorac, 3,7-dichloro-8-quinolinecarboxylic acid2,4-D, (2,4-dichlorophenoxy) acetic acid‘AP 10', ‘HI 25', ‘PI 28960', ‘K-7’ seashore paspalum, Paspalum vaginatum Swartz # PASVATurfgrass toleranceturfgrass qualityPASVAPOST, postemergencePRE, preemergenceWAT, weeks after treatment
Type
Research
Information
Weed Technology , Volume 11 , Issue 4 , December 1997 , pp. 689 - 692
Copyright
Copyright © 1997 by the Weed Science Society of America 

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