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Jack D. Fry and D. Wayne Wells

Field studies were conducted in south Louisiana to identify plant growth regulators that suppress carpetgrass (Axonopus affinis Chase.) seedhead development. In an initial study, best results were obtained with sethoxydim (0.11 kg·ha-1) and sulfometuron methyl (0.6 kg·ha-1), which reduced seedhead development by 88% and 86%, respectively, compared to untreated plots 21 days after treatment. Sulfometuron methyl caused unacceptable carpetgrass injury, however. Evaluation of seven sethoxydim application levels between 0 and 0.34 kg a.i./ha showed that carpetgrass seedhead number and elongation rate declined with increasing sethoxydim amount [SEEDHEAD NUMBER (m-2) = 515 – 1340 (kg), R 2 = 0.82; ELONGATION (cm) = 25.3 – 151 (kg) + 276 (kg2), R 2 = 0.77]. Carpetgrass seedhead production was restricted up to 6 weeks after sethoxydim (0.17 and 0.22 kg·ha-1) application. Chemical names used: (2-[1-(ethoxyimino)butyl]-5-[2-ethylthio)propyl)-3-hydroxy-2-cyclohexen-1-one) (seth-oxydim); (2-[[[[(4,6-dimethyl-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]benzoic acid) (sulfometuron methyl).

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Jack D. Fry

A field study was conducted in southern Louisiana to screen several plant growth regulators (PGRs) for efficacy in suppressing centipedegrass [Eremochloa ophiuroides (Munro) Hack.] vegetative growth and seedhead production. PGRs were applied in three sequential treatments in 1988 and included ethephon, glyphosate, mefluidide, paclobutrazol, sethoxydim, and sulfometuron methyl. Ethephon (5.0 kg·ha-1) suppressed mean centipedegrass vegetative growth by 15% with no turf injury. Mefluidide (0.6 kg·ha-1) and ethephon reduced mean seedhead number by 55% and 61%, respectively. Glyphosate (0.6 kg·ha-1) suppressed vegetative and reproductive growth, but caused unacceptable phytotoxicity and reduced centipedegrass cover and quality during Spring 1989. Use of ethephon or mefluidide to reduce trimming requirements or mower operation in hazardous areas may be an effective means of inhibiting centipedegrass growth. Chemical names used: N -(phosphonomethyl) glycine (glyphosate); N -[2,4-dimethyl-5-[[(trifluromethyl) sulfonyl]amino] phenyl]acetimide (mefluidide); 2-[1-(ethoxyimino)butyl] -5[2-(ethylthio) propyl]-3-hydroxy-2-cycIohexen-l-one (sethoxy-dim); 2-[[[[(4,6-dimethyl-2 -pyrimidinyl) amino] carbonyl]amino] sulfonyl]benzoic acid (sulfometuron methyl); (2-chloroethyl) phosphoric acid (ethephon); (±)-(R*R*)β-[(4-chlorophenyl)methyl]-α-(l,l-dimethylethyl) -1 H -l,2,4-triazole-l-ethanol (paclobutrazol).

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C.E. Wieland, J.E. Barrett, C.A. Bartuska, D.G. Clark and T.A. Nell

66 ORAL SESSION 15 (Abstr. 478–484) Plant Growth Regulators/Marketing–Floriculture/Foliage

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Diane M. Camberato, James J. Camberato and Roberto G. Lopez

efficiency. Growth regulator solutions made with high pH (greater than 7.0) or highly buffered (greater than 100 mg·L −1 CaCO 3 ) carrier water may reduce effectiveness, as suggested by Hammer (2001) . A grower survey ( Burns, 2004 ) indicated that 60% of

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C. Yang, D.Y. Jiao, Z.Q. Cai, H.D. Gong and G.Y. Li

plants in the wet season (WS) and treated with different plant growth regulators in the dry season. Different letters indicate significant differences at P < 0.05. ABA = abscisic acid; CK = control (water); GA 3 = gibberellic acid; Gs = gas stomatal

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Modeste Kan Kouassi, Jane Kahia, Christophe N’guessan Kouame, Mathias Gnion Tahi and Edmond Kouablan Koffi

different cocoa genotypes react differently to different callus-inducing hormones ( Traore and Guiltinan, 2006 ). Plant growth regulators play a key role by intervening in the reactions that lead to a reorientation of the program of gene expression. This

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Diana R. Cochran and Amy Fulcher

phytotoxicity ( Meijón et al., 2009 ) and be perceived as digressing from sustainable production ( Lütken et al., 2012 ). Plant growth regulators have several modes of action, including branch inducing, chemical pinching (chemicals that suppress apical dominance

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Antonios E. Tsagkarakis, Michael E. Rogers and Timothy M. Spann

systemic insecticides and the last treatment with contact insecticides was greater than 1 year before PGR treatment. Table 1. Active ingredient chemical name, trade name, manufacturer, and rate of plant growth regulators used to study the effects of

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Piyada Alisha Tantasawat, Atitaya Sorntip and Paniti Pornbungkerd

December) 2013 and the Summer (March to April) 2014 seasons ( A ) temperature in Celsius degrees ( B ) relative humidity in percentage. Exogenous application of plant growth regulators. To evaluate growth, floral and yield-related traits, and yield

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Amir Rezazadeh and Richard L. Harkess

produce compact plants ( Gibson and Whipker, 2001 ; Krug et al., 2005 ; Schluttenhofer et al., 2011 ; Warner and Erwin, 2003 ). Chlormequat and daminozide are growth regulators frequently applied to limit plant height in poinsettia [ Euphorbia