Horticultural Science, 2009 (vol. 36), issue 2

Preliminary evaluation results of new plum cultivars in a dense planting

J. Blažek, I. Pištěková

Hort. Sci. (Prague), 2009, 36(2):45-54 | DOI: 10.17221/3/2009-HORTSCI  

Sixteen new plum cultivars mostly bred in Germany were tested together with several standards in a high density experimental orchard established at Holovousy in the spring of 2004 with spacing 5 × 1.5 m. Trees were trained as spindles on St. Julian A rootstock. In the orchard the following characteristics were evaluated: tree vigour based upon measuring of trunk-cross section area and canopy volume, yields, time of flowering, time of fruit ripening and basic parameters of fruit quality. The highest yields and precocity of fruiting were recorded on cultivars Tophit, Jojo, Elena, and President, whereas the least productive were Ruth Gerstetter, Anna...

The development of population structure of Cryphonectria parasitica on European chestnut (Castanea sativa Mill.) in the Experimental Castanetarium Horné Lefantovce, observed over a 12-year study period

K. Adamčíková, M. Kobza, G. Juhásová

Hort. Sci. (Prague), 2009, 36(2):55-60 | DOI: 10.17221/30/2008-HORTSCI  

: We studied occurrence of chestnut blight disease in the Experimental Castanetarium Horné Lefantovce, SW Slovakia. The study ran in years 2006-2007 on a set consisting of 889 chestnut trees growing in the clonal orchard on Biological Plot 105. From this number, 857 trees were found healthy without disease symptoms. The chestnut blight disease was identified on 32 of them. The infected trees were examined for presence of pycnidia and perithecia of the causal agent. In all positive cases, the observed morphological characters indicated virulency of the obtained isolates. No hypovirulent isolate was detected on the evaluated experimental plot. In total,...

Colour stability of the flowers of some rose varieties measured in CIEDE₂₀₀₀

G. Boronkay, E. Jámbor-Benczúr, Á. Máthé

Hort. Sci. (Prague), 2009, 36(2):61-68 | DOI: 10.17221/1531-HORTSCI  

A variety trial has been carried out to study the colour stability of the flowers of some modern garden roses, especially of Hungarian varieties. 100 floribundas and polyanthas were observed. Colours of the petals were examined at three phenological stages of flowering: at bud opening and at the phenophase of young open flowers and aged open flowers. The colours were described in the 40° rotated CIE LCh model, and the differences were compared according to the CIEDE₂₀₀₀ standard. Our work has demonstrated Hungarian varieties with excellent colour stability present in each studied class. It has also been verified that the Hungarian bred floribundas...

Production and quality of milk thistle (Silybum marianum[L.] Gaertn.) cultivated in cultural conditions of warm agri-climatic macroregion

M. Habán, P. Otepka, Ľ. Kobida, M. Habánová

Hort. Sci. (Prague), 2009, 36(2):69-74 | DOI: 10.17221/38/2008-HORTSCI  

A polyfactorial field experiment was established and investigated during vegetation periods from 2004 to 2007 at the Dolná Malanta locality (Nitra district, Slovakia). The following parameters were measured: (1) yields of milk thistle (Silybum marianum [L.] Gaertn.) achenes, i.e. fruits, in 2004-2007; (2) content of silymarin in dry fruits of milk thistle in 2006-2007; and (3) total yields of silymarin per ha in 2006-2007. Factors of the experiment were as follows: (1) crop residues of cultivated pre-crop (no crop residues - K, with crop residues - R); (2) cultivation of freezing-out intercrop (no intercrop - B, with intercrop - M); (3) fertilization...

Air temperature changes and phenological phases of field cucumber (Cucumis sativus L.) in Poland, 1966-2005

R. Kalbarczyk

Hort. Sci. (Prague), 2009, 36(2):75-83 | DOI: 10.17221/49/2008-HORTSCI  

The aim of the work was to determine whether and how the frequently observed trends in air temperature changes affect the dates of phenophases of field cucumber (pickling variety) cultivated in Poland. Completion of the task included gathering of monthly and seasonal data concerning average air temperature in the vegetation seasonn of cucumber collected from 53 stations of the Institute of Meteorology and Water Management and of phenological and agrotechnical dates collected from 28 experimental stations of the Research Centre for Cultivar Testing over 1966-2005 all over Poland. Dependence between the dates of phenological phases and average air temperature,...