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disease resistance to black spot have been characterized in roses. Vertical or complete resistance, which blocks sporulation and severely restricts the mycelial growth of the pathogen, is usually controlled by major dominant genes ( Rdr or Rosa disease

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formulation and dried in a laminar flow hood for 4 h. The photocatalytic activity was tested on Xanthomonas sp. strain Xr-1 isolated from Rosa ‘Noare’ in Quincy, FL. The bacterial strain stored in 30% glycerol at –80 °C was plated on Yeast Nutrient Agar (YNA

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vessels used for acclimatization. Material and Method Plant material The various plant species and cultivars studied in this set of experiments belong to various botanical families and they are either ornamental or fruit species. Rosa hybrida ‘Red Bells

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purchase and preferences for the future market HortTechnology 28 807 814 10.21273/HORTSCI13511-18 Wu, X. Liang, S. Byrne, D.H. 2019 Heritability of plant architecture in diploid roses ( Rosa sp.) HortScience 54 236 239 Zlesak, D.C. 2009 Pollen diameter and

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sp.) are more preferred than those with roses ( Rosa hybrida ) only. Kelley et al. (2002) found that consumers value the addition of edible flower species more than they do additional flower colors and that consumers prefer multispecies choices

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infected, 4 = between 61% and 80% of the plant infected, and 5 = >80% of the plant infected. At the time of the study, rose rosette disease ( Emarovirus sp.) was not common in the area. Experimental design and data analysis. Experimental design was a

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), aphids (Aphididae), beetles (Coleoptera), and leaf cutter bees ( Megachile sp.) ( Horst and Cloyd, 2007 ). Also, nematodes (Nematoda) cause severe damage to the roots of roses by interfering with water and nutrient absorption, ultimately decreasing plant

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high-quality roses, crepe myrtle ( Lagerstroemia sp.), perennials, and annuals ( Chretien and Harp, 2017 ; Church et al., 2012 ; Harp et al., 2009 , 2017 ; Zlesak et al., 2015 ). Even though roses remain the most popular woody ornamental shrub in

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Chlorophyll fluorescence (CF) was evaluated as a technique to assess chilling injury of rose (Rosa sp.) leaves exposed to low temperatures. In the more susceptible genotypes, variable fluorescence (Fv) decreased dramatically as the temperature was lowered. In the less susceptible genotypes, Fv was more stable and decreased more slowly as temperature fell. Our results suggest that measurement of CF may provide a rapid method to prescreen genotypes for chilling susceptibility, as required in plant breeding.

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The effect of two temperature regimes (29 °C day/24 °C night and 24 °C day/18 °C night) and of a 4-hour night interruption, during production, was studied on postproduction flower longevity and bud drop of 'Meirutral' and 'Meidanclar' potted, miniature roses (Rosa L. sp.). High production temperatures increased postproduction flower longevity and decreased postproduction bud drop. In 'Meidanclar', the high production temperature increased incidence of malformed flowers. No effects of night interruption could be shown on either postproduction flower longevity or bud drop.

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