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A.G. Reynolds, D.A. Wardle, A.C. Cottrell, and A.P. Gaunce

to Bill Moons, Chipman, for his gift of paclobutrazol and to ICI Americas for the dichlobutrazol used as an internal standard in the residue analysis. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal

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Mauricio J. Sarmiento and Jeff S. Kuehny

Rhizomes of Curcuma alismatifolia Roxb. `Chiang Mai Pink', C. gracillima Roxb. `Violet', and C. thorelii Roxb. were soaked in gibberellin (GA4+7) at 0, 200, 400, or 600 mg·L-1 (ppm) and planted into 15.2-cm-diameter (6 inches) containers. The plants were grown in a greenhouse at 30 °C day/23 °C night (86.0/73.4 °F) temperatures. When shoot height was 10 cm (3.9 inches), the plants were drenched with 118 mL (3.9 fl oz) of paclobutrazol at 0, 2, 3, or 4 mg a.i. per 15.2-cm-diameter container. Gibberellin4+7 delayed shoot emergence and fl owering but did not affect the fl ower number. Paclobutrazol rates were not effective in controlling height of C. alismatifolia `Chiang Mai Pink' averaging 85 cm (33.5 inches), C. gracillima `Violet' averaging 25 cm (9.8 inches), or C. thorelii averaging 17 cm (6.7 inches). Curcuma alismatifolia `Chiang Mai Pink', C. gracillima `Violet', and C. thorelii had postproduction longevities of 4.6, 2.6 and 3.8 weeks respectively, making these three species of curcuma excellent candidates for use as fl owering pot plants.

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Dennis E. Deyton, Carl E. Sams, and John C. Cummins

1 Assistant Professor. 2 Research Associate. We wish to acknowledge ICI Americas, Inc. for supplying the paclobutrazol used in these experiments. We appreciate the assistance of Bill Sanders, Statistician, in analysis of data. The cost of

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Brian A. Krug, Brian E. Whipker, and Ingram McCall

(excluding the pot) would be considered commercially acceptable ( Barrett et al., 1995 ). Paclobutrazol (Bonzi; Syngenta, Greensboro, N.C.) substrate drench recommendations vary from 8 mg·L −1 ( Dole and Wilkins, 2005 ), 0.5 to 1 mg/pot a.i. ( Barrett et al

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Stanislav V. Magnitskiy, Claudio C. Pasian, Mark A. Bennett, and James D. Metzger

plants, Dr. Kari Green-Church and Mrs. Nan Kleinholz at the Chemical Instrumentation Center, The Ohio State University, for help with mass spectrometry analysis of paclobutrazol residue in plant samples, and Mr. Bert Bishop for assistance in data analysis.

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David M. Hunter and John T.A. Proctor

We gratefully acknowledge the gift of paclobutrazol from Chipman. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement

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David M. Hunter and John T.A. Proctor

We gratefully acknowledge the gift of paclobutrazol from Chipman, Inc. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement

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David M. Hunter and John T.A. Proctor

We gratefully acknowledge the gift of paclobutrazol from Chipman. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to

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William B. Miller

often elongate excessively and the plant quality suffers. Gianfagna and Wulster (1986) first showed the efficacy of paclobutrazol or ancymidol for freesia growth control. Using five cultivars, drenches of these PGRs (5 mg a.i./pot) reduced plant height

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James E. Altland, Leslie Morris, Jennifer Boldt, Paul Fisher, and Rosa Raudales

Paclobutrazol is a triazole plant growth retardant widely used in the horticulture industry. Growth retardation results from inhibition of gibberellin biosynthesis, resulting in shorter internodes and more compact growth habit in many plant species