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Boronkay G.,Research Institute for Fruit Growing and Ornamentals
Acta Horticulturae | Year: 2015

A method to quantify the ornamental value (OV) of a flower of garden rose (Rosa x hybrida) was created, based strictly on measurements. Here OV means the capacity to produce a uniform colour effect. The blooming time of flowers was distributed into 23 phenological sub-stages from the immature bud to the falling of petals. CIEDE2000 standard chromatic differences (ΔE00) were calculated between the petal colours of each stage and stage 6 - the optimal state of the flower. The ornamental value of a colour is OVc=15-ΔE00. The OV of a stage is OVs=Av%xOVc, where Av% is the relative visible surface of the flower as a percentage of the surface of stage 6. The total OV of a section of stages is OVt=Σ(Av%x(15-ΔE00)xls), where ls is the length of each stage measured in days. The OVt should be calculated for three different sections of subsequent flowering stages: a) the whole life of the flower (2-9 stages), b) the life of the flower before dead-heading (2-7.5 stages), and c) the middle (5.5-7) stages. In 2012, the method was further improved by the interpolation of the colour parameters at the non-measured stages. This new method is presented with an example of 10 red floribunda and polyantha rose cultivars. According to the OVt scores, 9 of the examined 10 cultivars are highly attractive to stage 7.5, but two of them have low ornamental value if the whole life of the flower is taken into consideration. According to the scores, these two cultivars need deadheading while the others don't need this process. According to the results, this OV calculation gives objective results, and is also suitable for determining the extent of maintenance the cultivars require. © 2015 International Society for Horticultural Science. All rights reserved.

Toth M.,Hungarian Academy of Sciences | Josvai J.,Hungarian Academy of Sciences | Hari K.,Corvinus University of Budapest | Penzes B.,Corvinus University of Budapest | And 8 more authors.
Acta Phytopathologica et Entomologica Hungarica | Year: 2014

For acceptable capture efficiency it was necessary to add acetic acid to pear ester for successful trapping of codling moth populations in Hungary. The activity of pear ester on its own was very weak and unsatisfactory. Pear ester+acetic acid baited traps caught on an average 25% (mean of 6 tests) of the catch in pheromone traps. Traps with pear ester+acetic acid were clearly advantageous as compared to pheromone traps in that they caught not only males but also females (both virgins and mated) in a high percentage. Traps baited with pear ester+acetic acid clearly outperformed high-load pheromone lures in orchards with mating disruption and should be the right choice for the grower for sampling populations of codling moth in a mating disruption situation. In orchards with no mating disruption the relative inefficiency of pear ester+acetic acid baited traps as compared to pheromone traps can easily be overcome by applying more traps than usual. Thus the overall codling moth numbers caught will become higher and would make any conclusions drawn more reliable. Traps baited with pear ester+acetic acid always caught more when set at the highest branches (3.0-3.5 m) than when set lower (1.5-1.8 m) on trees. © 2014 Akadémiai Kiadó.

Mansvelt E.L.,ARC Infruitec Nietvoorbij | Pieterse W.-M.,ARC Infruitec Nietvoorbij | Shange S.B.D.,ARC Infruitec Nietvoorbij | Mabiya T.C.,ARC Infruitec Nietvoorbij | And 4 more authors.
Acta Horticulturae | Year: 2015

The peach breeding program of the Agricultural Research Council of South Africa aims to develop early-ripening varieties. For the optimization of embryo rescue, open-pollinated early-ripening 'Honeyblush' peaches were used according to the method of Ramming et al. (2003). Their medium was compared to three media with or without activated charcoal (AC). Results of this investigation showed that the trend in germination responses on the four media with or without AC was similar. During acclimatization, the treatments to prevent waterlogging of roots had no significant effect and 73% of plantlets survived. © 2015 ISHS.

Hevesi M.,Corvinus University of Budapest | Blazovics A.,Semmelweis University | Kallay E.,Research Institute for Fruit Growing and Ornamentals | Vegh A.,Corvinus University of Budapest | And 3 more authors.
Food Technology and Biotechnology | Year: 2012

This study is the first report on the antibacterial effect of Hungarian sour cherry cultivars. Biological activity of sour cherry juices prepared from fruits Érdi jubileum, Érdi bo{double acute} -termo{double acute} , Maliga emléke and Kántorjánosi 3 harvested at different maturity stages was investigated on bacteria present in human saliva. The influence of sour cherry on a mixed bacterial flora of human saliva of 10 volunteers was determined by different experimental approaches. Bactericidal effects were evaluated by minimum inhibitory concentration (MIC) using agar diffusion methods and by minimum bactericidal dilution (MBD) assays counting the number of surviving bacterial cells in the diluted juices. Time-dependent antibacterial effects were also determined by monitoring the decrease in bacterial cell numbers after the treatment with undiluted juices. The investigated sour cherry juices displayed an impressive bactericidal effect against human saliva bacteria (10-100× reduction of cell numbers) within a short time frame (10-40 min). Érdi jubileum was more effective (100 000× reduction of cell number after 270 min) than the other studied cultivars. Bactericidal effect was influenced by ripening of samples of Érdi jubileum obtained at different harvesting dates. Biologically active components were effective against a large spectrum of opportunistic bacterial pathogens such as Pseudomonas, Klebsiella, Pantoea spp. and Escherichia coli, including the antibiotic-resistant Pseudomonas aeruginosa but they were ineffective against beneficial probiotic Lactobacillus spp. Results confirmed the antibacterial potential of all the investigated sour cherry fruits, therefore the consumption of the fruit or its juice for positive influence on oral hygiene is highly recommended.

Jambor-Benczur E.,Corvinus University of Budapest | Terek O.,Corvinus University of Budapest | Boronkay G.,Research Institute for Fruit Growing and Ornamentals | Mathe A.,University of West Hungary
Acta Horticulturae | Year: 2010

The effect of 1-MCP on rose cultivar 'Bordeaux' was studied in the case of different preservative solutions. The flowers were treated with 1-MCP for 6 hours at 17°C and for 18 hours on 4°C. The diameter of flowers and the vase life proved to be better with the treatment of 18 hours. The best result was achieved, when the flowers were treated with 1-MCP (18 hours) in Spring solution. In this case 11,2 days was the vase life compared to control 8,25 days, that way the vase life was extended with 3 days.

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