Herbicide Effects on Tensile Strength and Rooting of Centipedegrass Sod

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  • 1 Department of Agronomy and Soils, Auburn University, Auburn, AL 36849-5412

“Effects of selected herbicides on sod tensile strength and rooting of mature and immature turf of common centipedegrass [Eremochloa ophiuroides (Munro.) Hack] were studied in field experiments. Herbicides evaluated were atrazine, atrazine + tridiphane, bensulide, DCPA, DPX-6316, imazapyr, imazaquin, napropamide, oxadiazon, pendimethalin, sethoxydim, simazine, and sulfometuron. At 2, 4, and 8 weeks after treatment (WAT), sod tensile strength was determined, and root length and number were measured 7 to 10 days later. In 1986 sod tensile strength was not affected, but in 1987 the tensile strength of the immature turf was reduced at 8 WAT by bensulide and imazapyr. Rooting was suppressed most by benstdide, imazapyr, napropamide, and sulfometuron at most rates and dates tested. By 8 WAT, root length, root number, and tensile strength of herbicide-treated centipedegrass sod did not differ from that of the untreated sod except for those plots treated with bensulide or imazapyr. Chemical names used: 6-chloro-N-ethyl-N' -(1-methylethyl) -1,3,5-triazine-2,4 -diamine (atrazine); 2-(3,5-dichlorophenyl) -2-(2,2,2-trichloroethyl) oxirane (tridiphane); O,O -bis(l-methylethyl)S-[2-[(phenylsulfonyl) amino] ethyl] phosphorodithioate (bensulide); dimethyl 2,3,5,6 -tetrachloro-1,4 -benzenedicarboxylate (DCPA); methyl 3-[[(4-methoxy-6-methyl-1,3,5-triazin-2-ylaminocarbonyl]aminosulfonyl]-2-thiophenecarboWlate (DPX-6316); (&)-2-[4,5 -dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl] -3-pyridinecarbolic acid (imazapyr); 2-[4,5-dihydro-4 -methyl-4 -(1-methylethyl) -5-oxo-W-imidazol-2-yl]-3 -quinolinecarboxylic acid (imazaquin); N,N-diethyl-2-(1-naphthalenyloxy)propanamide (napropamide); 3-[2,4-dichloro-5 -(1-methylethoxy) phenyl]-5-(l,l-dimethylethyl)-1,3,4 -oxadiazol-2-(3H) -one (oxadiazon); N-(1 -ethylpropyl)-3, 4-dimethyl-2,6-dinitrobenzenamine (pendimethalin); .2-[1-(ethoxyimino) butyl]-5-[2-(ethylthio) propyl]-3-hydroxy-2 -cyclohexen-1-one (sethoxydim); 6-chloro-N,N'-diethyl-1,3,5-triazine-2)4-diamine (simazine); 2-[[[[(4,6-dimethyl-2-pyrimidinyl)amino]carbonyl] amino] sulfonyl] benzoic acid (sulfometuron).

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