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Jongyun Kim, Seung Won Kang, Chun Ho Pak, and Mi Seon Kim

Ingot’) and polka dot plant were obtained from a local garden center in Seoul, Korea. All the seedlings were transplanted into 3-inch-diameter round plastic pots filled with vermiculite (30% by volume) and soilless substrate [70% by volume (Sunshine

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Terri Woods Starman, Estella Auerswald, and P.T. Gibson

The objective of the research was to determine the effectiveness of uniconazole on Hypoestes phyllostachya Bak. cv. Pink Splash and to compare the effect and persistence of uniconazole with chlormequat and daminozide for limiting stem elongation during post-greenhouse, low light conditions. Uniconazole at 5.0 mg·liter-1 reduced all measured plant dimensions to the same degree as chlormequat at 2500 mg· liter-l when both chemicals were applied twice as foliar sprays at a two week interval. These treatments resulted in the most compact and aesthetically pleasing 0.4-liter potted plants. However, this uniconazole treatment was not as persistent in postproduction low light conditions as chlormequat. By the fifth week under low light conditions, only the highest drench concentration of uniconazole tested (0.10 mg a.i. per pot) remained the same height as chlormequat treated plants.

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Terri Woods Starman and P.T. Gibson

The effectiveness of uniconazole for height control of Hypoestes (Hypoestes phyllostachya Bak. `Pink Splash') was determined, and the persistence of uniconazole with chlormequat and daminozide for limiting stem elongation in a low-light interior environment was compared. Spray and drench applications of uniconazole decreased plant height linearly with increased concentration. Two uniconazole sprays at 5.0 mg·liter -1, 0.05 mg a.i./pot uniconazole drench, or two chlormequat sprays at 2500 mg·liter-1 resulted in equally aesthetic plant size for 0.4-liter pots. Chlormequat was more effective than uniconazole for reducing rate of growth in the postharvest environment. No difference in postproduction rate of growth occurred between two sprays at 5.0 mg·liter-1 and 0.05 or 0.10 mg a.i./pot drench treatments of uniconazole. Chemical names used: 2-chloro -N,N,N- trimethylethanaminium chloride (chlormequat chloride); butanedioic acid mono(2,2-dimethylhydrazide) (daminozide); (E)-(S) -1-(4-chlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)-pent-l1ene-3-ol (uniconazole).

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Chi Wang and Kevin L. Grueber

Control of plant height and flowering are two major problems associated with the production of Hypoestes phyllostachya Bak. (polka-dot plant). In seed-propagated cultivars, sprays of ancymidol (A-Rest), chlormequat (Cycocel), paclobutrazol (Bonzi), and uniconazole (Sumagic) were effective in inhibiting shoot growth and internode elongation at 100, 1000, 33, and 10 mg·l-1, respectively. Daminozide (B-Nine), even at 6000 mg·l-1, was ineffective compared to untreated controls. Ethephon (Florel) was effective in retarding plant growth at 500 mg·l-1, but at 1500 mg·l-1 resulted in leaf distortion and horizontal shoot growth.

H. phyllostachya was determined to be a quantitative (facultative) short day plant. Seed-propagated plants with 16 or more nodes flowered regardless of photoperiod, but flowering was more rapid under short days (SD) than under long days (LD). Application of ethephon significantly inhibited shoot elongatioo and number of flower buds formed and also increased the incidence of flower bud abortion. In seed-propagated plants, 500 mg·l-1 ethephon did not adversely affect flowering when applied at any time during the first seven weeks after the start of SD. At 1500 or 2500 mg·l-1, ethephon applied at any time during the first five weeks after the start of SD maximized the number of vegetative buds and minimized the number of viable flower buds. When applied more than six weeks after SD began, ethephon did not promote the formation of vegetative axillary buds but did promote flower bud abortion.

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W. Garrett Owen and Roberto G. Lopez

.1° to 55.8° with resulting hues of green, green, and red, respectively. Similarly, Kim et al. (2012) reported that fully expanded and recently expanded English ivy ( Hedera helix L. ‘Golden Ingot’) and polka dot plant ( Hypoestes phyllostachya Baker

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W. Garrett Owen and Roberto G. Lopez

measure foliage color of mountain laurel ( Kalmia latifolia L.), polka dot plant ( Hypoestes phyllostachya Baker) and English ivy ( Hedera helix L. ‘Golden Ingot’), and red leaf lettuce varieties, respectively. Furthermore, Madeira et al. (2003) and

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Pedro García-Caparrós, Olga González-Salmerón, Mónica Pérez-Saiz, Raquel Calatrava, María Teresa Lao, Rosa María Chica, and Gumersindo De la Cruz

Kim, J. Kang, S.W. Pak, C.H. Kim, M.S. 2012 Changes in leaf variegation and coloration of english ivy and polka dot plant under various indoor light intensities HortTechnology 22 49 55 Kittas, C. Katsoulas, A. Baille, A. 2003 Influence of aluminized