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  • Author: Elżbieta Rozpára x
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Open access

Agnieszka Głowacka and Elżbieta Rozpára

Abstract

The aim of the work was to select pollinators for sweet cherry cultivars: ‘Vanda’, ‘Techlovan’, ‘Syl–via’ and ‘Regina’, which are of great economic significance in Poland. As pollinators, three or four different cultivars with the same or similar flowering time as the pollinated cultivars were evaluated annually. The pollinators belonged to different incompatibility groups. Pollination was carried out over four consecutive seasons. Assuming that for a good yield more than 20% of the flowers should develop fruits, a good polli–nator for the cv. ‘Vanda’ was ‘Techlovan’, and for the cv. ‘Regina’ - ‘Sylvia’. The cv. ‘Techlovan’ was pollinated to best effect by ‘Vega’, and the cv. ‘Sylvia’ by ‘Regina’, but the setting of fruits in the last two combinations was moderately good. Low to moderately good fruit setting but depending on the year was observed in the combinations ‘Sylvia’ x ‘Summit’, ‘Regina’ x ‘Summit’, and ‘Regina’ x ‘Rainier’. Cultivar ‘Summit’ for ‘Sylvia’, and ‘Summit’ and ‘Rainier’ for the cv. ‘Regina’ should not be used as pollinators because the low percentage of fruit set obtained annually does not guarantee a satisfactory yield.

Open access

Tadeusz Malinowski, Elżbieta Rozpara and Zygmunt S. Grzyb

Abstract

Susceptibility of plum cultivars: 'Katinka', 'Jubileum', 'Diana', 'Valjevka', 'Żółta Afaska', 'Elena', 'Jojo', 'President', 'Vision', and 'Węgierka Zwykła' (Pozegaca type, included as reference, highly susceptible cultivar) to aphid-vectored Plum pox virus (strain D), was evaluated. The trees were grown for 7-8 years in the field characterized with high infection pressure. 'Katinka' and 'President' showed susceptibility even higher than 'Węgierka Zwykła'. 'Vision' and 'Valjevka' showed relatively low susceptibility with less than 30% of trees becoming infected. All 'Jojo' trees remained free from ELISA-detectable amounts of PPV, although a high percentage of the fruit of this cultivar showed sharka-like symptoms on stones and fruit flesh. The reason for that phenomenon is not known.

Open access

Magdalena Jasińska-Stroschein, Piotr Szcześniak, Jacek Owczarek, Krzysztof P. Rutkowski, Jarosław Markowski, Elżbieta Rozpara and Daria Orszulak-Michalak

Abstract

The allergic reactions to fruits are lesser known among food sensitivities. The most common fruits belonging to the Rosaceae family that might cause allergic reactions are apples, pears and peaches. However, little is known about the potential allergic reactions caused by another member of the Rosaceae, the cherry. The aim of this study was to assess the risk of any allergic reaction or food hypersensitivity resulting from topical application and chronic oral administration of cherry fruits. The cherry fruits ‘Sabina’ cv. were produced in the orchard in Dąbrowice according to the principles of integrated (IFP) and organic (OR) productions. Fruits of ‘Debreceni Bötermö’ cv. were produced in Dąbrowice (IFP), and in the orchard in Nowy Dwór (OR). The experiments were performed on 65 outbred young, adult, white albinotic guinea pigs (Dankin Hartley). Three procedures were applied: I. Guinea-Pig Maximization Test (GPMT); II. Chronic administration of fruits and III. Skin prick (Dreborg) test. The skin reactions based on GPMT or Dreborg tests revealed no differences between the two cherry cultivars ‘Sabina’ and ‘Debreceni’ obtained from integrated or organic production. Similarly, it was not observed of any effect of cultivars of cherries nor the type of fruits production on the guinea pig skin reaction as a result of chronic feeding with fruits.