Horticultural Science, 2014 (vol. 41), issue 2
Tergitol as a possible thinning agent for peach cv. RedhavenOriginal Paper
B. Ambrožič Turk, N. Fajt, M. Stopar
Hort. Sci. (Prague), 2014, 41(2):49-54 | DOI: 10.17221/22/2014-HORTSCI 
The effect of different blossom thinners ammonium thiosulfate (ATS) (1%, 2%), Armothin (1.5%), Tergitol-TMN-6 (0.5%, 1%), applied on peach cv. Redhaven at 50-60% full bloom was evaluated in thinning experiments in south-west Slovenia. The photosynthesis inhibitor metamitron (0.05%) applied at 8 mm fruit diameter was evaluated as fruitlet thinner as well. Application of 2% ATS resulted in excessive thinning. The thinning effect of 1% ATS was also too strong in two out of three thinning experiments. The use of 0.05% metamitron did not cause any thinning effect on peach trees and gave similar results as the non-treated control. The effective fruit set...
Cryopreservation of cherry rootstock Gisela 5 using vitrification procedureOriginal Paper
Dj. Ružić, T. Vujović, R. Cerović
Hort. Sci. (Prague), 2014, 41(2):55-63 | DOI: 10.17221/234/2013-HORTSCI
In vitro-grown shoot tips of Gisela 5 (Prunus cerasus × Prunus canescens) cherry rootstock were tested for regrowth after cryopreservation using vitrification technique. Explants were precultured in the dark at 23°C, in a liquid MS medium with a progressively increasing sucrose concentration (0.3 M for 15 h, then 0.7 M for 5 h), and subsequently loaded in a solution containing 2 M glycerol and 0.4 M sucrose for 20 minutes. Shoot tips were dehydrated at 0°C using either the original PVS2 or modified PVS2 solution (PVS A3 - 22.5% sucrose, 37.5% glycerol, 15% ethylene glycol and 15% DMSO) for 30, 40 and 50 minutes. The survival...
Nutritional and sensory value of conventionally vs organically grown Chinese radish (Raphanus sativus L. var. longipinnatus)Original Paper
M. Jurica, K. Petříková
Hort. Sci. (Prague), 2014, 41(2):64-70 | DOI: 10.17221/200/2013-HORTSCI
The nutritional and sensory value of Chinese radish, cv. Jarola F1, grown in organic and conventional systems was evaluated. The experiments were based on certified organic land and conventional land of the Czech University of Life Sciences Prague at the experimental station of Troja. Radish was grown in two spacings. Radish from the organic cultivation system exhibited a significantly lower dry matter content compared to the conventional production, 62.4 g/kg and 68.9 g/kg, respectively. This can be explained by growing under unwoven textile. Furthermore, radish cultivated organically had a significantly lower content of monosaccharides (17.2 mg/kg,...
Chilling stress applied to broccoli transplants of different age affects yield of the plants cultivated in summerOriginal Paper
A. Grabowska, E. Kunicki, A. Kalisz, R. Wojciechowska, M. Leja, A. Sękara
Hort. Sci. (Prague), 2014, 41(2):71-79 | DOI: 10.17221/250/2013-HORTSCI
Broccoli is native to moderate climatic zone, and summer cultivation of this species in Central Europe conditions leads to a decrease of heads quality. The aim of present investigations was application of dark-chilling at 2°C for 1 and 2 weeks to transplants of various ages to enhance its tolerance against adverse conditions in the field and to modify the yield potential. Broccoli cv. Monaco F1 can be recommendedfor summer production in Central Europe, because of high yield potential and lack of buttoning in high temperature conditions. Dark-chilling of 4-week-old transplants for two weeks significantly increased the yield, but also the...
Seasonal dynamics of the cabbage armyworm (Mamestra brassicae [L.]) and the bright-line brown-eyes moth (Mamestra oleracea [L.]) in SloveniaOriginal Paper
M. Devetak, T. Bohinc, M. Kač, S. Trdan
Hort. Sci. (Prague), 2014, 41(2):80-88 | DOI: 10.17221/209/2013-HORTSCI
The cabbage armyworm (Mamestra brassicae L.) and the bright-line brown-eyes moth (Mamestra oleracea L.) are polyphagous insect species. From 2008 to 2010, we monitored the seasonal dynamics of both pests in two locations in Slovenia, Ljubljana and the Nova Gorica region. Pheromone traps (VARL + type) were used to precisely determine the occurrence of adults, i.e., the beginning and end of generations and the peaks of the populations. This allowed us to examine the relationship between the quantity of pests, average daily air temperature and average daily precipitation. Our results established that there were two generations of Mamestra...
Effect of bulb size on growth, flowering and bulb formation in lachenalia cultivarsOriginal Paper
A. Kapczyńska
Hort. Sci. (Prague), 2014, 41(2):89-94 | DOI: 10.17221/183/2013-HORTSCI
A two-year field experiment was performed with three lachenalia cultivars of the African Beauty® series (Namakwa, Ronina, Rosabeth) to study the effects of bulb size on leaf formation, inflorescence quality and bulb formation. The test bulbs were divided into two size groups based on their circumference: 4.0-5.0 cm and 5.1-6.0 cm. The bulbs were cultivated in the open air in the conditions of southern Poland in 2009 and 2010. Plant height, inflorescence length, stem diameter and the number of florets, which are all very important quality features, increased with increasing bulb size at planting. The study showed that the larger bulbs of...
In vitro elimination of Black raspberry necrosis virus from black raspberry (Rubus occidentalis) - Short CommunicationShort Communication
E.J. Cheong, A.R. Jeon, J.W. Kang, R. Mock, G. Kinard, R. Li
Hort. Sci. (Prague), 2014, 41(2):95-99 | DOI: 10.17221/266/2013-HORTSCI
Black raspberry necrosis virus (BRNV) is one of the most important viral pathogens of Rubus spp. In this study, a procedure combining in vitro culture and heat therapy on axillary buds of Rubusoccidentalis was developed to eliminate BRNV from infected plants. Axillary buds were grown aseptically at 4-h alternating periods of 29°C and 38°C with 14-h day length for 1-5 weeks. Shoots induced after thermotherapy were tested for the viruses by RT-PCR. BRNV was not detected in any shoots indicating that BRNV was heat labile. BRNV-free shoots were rooted in vitro and acclimatized in greenhouse. Regenerated...