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Dwarf bermudagrass morphological characteristics following the use of plant growth regulators have not been reported. The objective of this greenhouse study was to determine short-term effects of seven plant growth regulators on clipping yield, chlorophyll concentra- tion, and root mass of 'TifEagle' bermudagrass. Growth regulators tested included ethephon, fenarimol, fl urprimidol, maleic hydrazide, mefl uidide, paclobutrazol, and trinexapac-ethyl. Two applications of each compound were made over a 6-week period. Root mass was reduced 39% by fenarimol and 43% by fl urprimidol, while other PGRs had root mass similar to un- treated turf. 'TifEagle' bermudagrass treated with paclobutrazol, mefl uidide, fenarimol, and fl urprimidol averaged 45% less root mass than trinexapac-ethyl-treated turf. Trinexapac-ethyl was the only compound to reduce clippings and enhance turf quality without negative rooting effects. Chemical names used: (4-(cyclopropyl-(α)-hydroxymethylene)-3,5-dioxo-cyclohexane carboxylic acid ethyl ester) (trinexapac-ethyl); {α-(1-methylethyl)-α-(4-(trifl uoro-methoxy) phenyl) 5-pyrimidine-methanol} (fl urprimidol); (+/-)-(R*,R*)-β-((4-chlorophenyl) methyl)-α-( 1, 1-dimethyl)-1H-1,2,4,-triazole-1-ethanol (paclobutrazol); (N-(2,4-dimethyl-5 (((trifl uoro- methyl)-sulfonyl) amino)phenyl)acetamide) (mefl uidide); (1,2-dihydro-3,6-pyridazine-dione) (maleic hydrazide); ((2-chloroethyl)phosphonic acid) (ethephon); and (2-(2-chlorophenyl)-2- (4-chlorophenyl)-5-pyrimidinemethanol) (fenarimol).

Response of `TifEagle' Bermudagrass to Seven Plant Growth Regulators