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T.J. Blom

Bract edge burn (BEB) has been observed in different greenhouse operations across North America over the past 10 years. The symptoms develop at anthesis or shortly after shipping. Varieties such as `Supjibi', `V-14 Glory', and `Celebrate 2' are considered susceptible cultivars. A number of trials using endosulfan (Thiodan) have been conducted. In 1993, `Supjibi' branched poinsettias were sprayed with either Thiodan, Decis, Thiodan + Decis, or water or remained unsprayed. The sprays were applied in week 39, 42 or 45. For each treatment period, plants were treated three times at 4-day intervals at label recommendations. At anthesis (week 47), plants sprayed with Thiodan or Thiodan + Decis during week 39 showed necrosis in the margin of the transitional bracts. In 1994, single spray applications in week 39, 40, 41, 42, or 45 of Thiodan, Ca (400 ppm), Thiodan + Ca in a tank mix, unsprayed, or Thiodan followed by four calcium sprays (weekly) in November. At week 48, all treatments except the latter showed necrosis, except this time it was marginal flecking in the transitional or primary bracts. In Spring 1995, single vs. multiple Thiodan applications were compared.

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Richard J. McAvoy, Bernard B. Bible, and Xiusheng Yang

Poinsettias were grown in a closed hydroponic system with a modified Hoagland's solution concentration of either 1 or 3 mS·cm-1. Water use and whole plant fresh mass were measured gravimetrically at 2 to 3 day intervals over an eleven week period (initial break development through full bract development). At two week intervals, poinsettias were harvested and the fresh and dry mass of leaves, bracts stems, and roots were determined, and total laminar surface area was measured. Leaf temperature (LT), root-zone solution temperature (RZT), and at canopy level, air temperature (CAT), VPD, and photosynthetic photon flux (PPF) were monitored at 1 mm intervals and mean values recorded each 30 mm using a 21X micrologger (Campbell Scientific, Logan Utah). Water use (ml·dm-2·day-1) averaged 15% higher for poinsettias grown in the 1 mS·cm-1 solution than in the 3 mS·cm-1 nutrient solution. Simple linear regression of daily water use with PPF, or VPD, or CAT, while significant, accounted for less than half of the daily fluctuation in water use (r2; PPF= 0.47, VPD=0.21, CAT=0.30). However, multiple regression involving daily PPF, VPD, CAT, RZT and LT accounted for up to 82% of the variation in daily water use.

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Yanjun Guo, Terri Starman, and Charles Hall

/40, 40/20, and 20/20% SMC) on bracts coloring percentage measured over three production weeks for ‘Freedom Red’ in 2016 experiment ( A ) and ‘Christmas Eve Red’ in 2017 experiment ( B ). Means separation by Student-Newman-Keuls (SNK) multiple comparisons

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Thomas J. Molnar, Megan Muehlbauer, Phillip A. Wadl, and John M. Capik

( Fig. 1 ). It exhibits a moderately vigorous, upright growth habit with dark-green foliage and, most notably, large, dark-pink floral bracts ( Fig. 2 ). It has also shown strong field tolerance to the pathogens causing dogwood anthracnose ( Discula

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Sea Yeat Choon and Phebe Ding

separate leafless peduncle arising from the underground rhizome ( Choon and Ding, 2016 ). The height of the leaf stalk is ≈3–4 m whereas the peduncle length is ≈0.7 m. The torch ginger inflorescence is composed of involucral and floral bracts. The

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Robert N. Trigiano, Alan S. Windham, Mark T. Windham, and Phillip A. Wadl

), Appalachian Blush (AB), Appalachian Joy (AJ), and Appalachian Spring (AS)], powdery mildew susceptible [Cherokee Princess (CP)], and powdery mildew susceptible with multiple bracts [Plena (P)]. The University of Tennessee was issued a United States plant

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Paul R. Fantz, Dennis Carey, Tony Avent, and Jason Lattier

variation within the rachis, bracts (2–3 mm) and pedicels typically shorter (1–3 mm), flower color lighter, lavender to paler, and fruits in cultivation as uncommon. Contrasting, Hume’s L. exiliflora has shorter broader leaves, to 30 cm long × 6–12 mm wide

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Xiaohui Lin, Hongbo Li, Shenggen He, Zhenpei Pang, Shuqin Lin, and Hongmei Li

after being maintained in darkness for 3 h. Three samples (≈2 × 5 mm) were excised with a razor blade from the upper and lower leaf epidermis; adaxial and abaxial epidermis of the petals, sepals, and bracts; and stem surface. All sections were observed

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Ying Gao, Hao Liu, and Dong Pei

). Fig. 1. External morphology of walnut staminate catkins: A–F and H are the seven stages of staminate flower. ( A ) Stage 1, the catkins were oblate, only squama externally visible. ( B ) Stage 2, the catkins began to elongate and the bract became

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Peter Alem, Paul A. Thomas, and Marc W. van Iersel

effect of WD on quality characteristics such as bract color and size, and 3) compare the effects of WD on plant quality to those of PGRs. Materials and Methods Plant material and growing conditions. Poinsettia ‘Classic Red’ cuttings, rooted in phenolic