Tag Archives: winter-hardiness

2785–2796 M. Vinogradov,, R. Rätsep, and L. Arus
Suitability of blue honeysuckle (Lonicera caerulea L.) cultivars of different origin for cultivation in the Nordic-Baltic climate
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Suitability of blue honeysuckle (Lonicera caerulea L.) cultivars of different origin for cultivation in the Nordic-Baltic climate

M. Vinogradov¹,*, R. Rätsep¹,² and L. Arus¹

¹Polli Horticultural Research Centre, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Uus 2, EE69108 Viljandi county, Estonia
²Estonian University of Life Sciences, Institute of Veterinary Medicine and Animal Sciences, Chair of Food Science and Technology, Kreutzwaldi 1, EE51006 Tartu, Estonia

Abstract:

The rising trend of blue honeysuckle has led to the increase in new plantations and berry production in recent years in Nordic-Baltic region, including Estonia. This crop is naturally distributed in the temperate climate zone of Northern Hemisphere. Estonia is also located in the same climate zone, but differs only from warm maritime air. The main aim of this research was to find out cultivars’ adaptation to the changing weather conditions regarding winter hardiness, fruit weight, yield and occurrence of secondary flowering. The data was recorded from two closely situated plantations in Polli village, Viljandi County, Estonia. Eighteen cultivars of blue honeysuckle with different origin (Russia, Canada, Poland and Czech Republic) were tested. In 2016, greater winter damage was recorded when compared to the period of 2017–2020 with just marginal damage. In conclusion, the Canadian cultivars (‘Borealis’, ‘Indigo Gem’, ‘Indigo Treat’ and ‘Tundra’) and Polish ‘Duet’, presented their best properties and suitability to Estonian climatic conditions.

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2727–2742 N. Krasova,, L. Ikase and D. Dēķena
Evaluation of the main biological and production traits of Latvian apple cultivars in the conditions of Central Russia
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Evaluation of the main biological and production traits of Latvian apple cultivars in the conditions of Central Russia

N. Krasova¹,*, L. Ikase² and D. Dēķena²

¹All-Russian Research Institute of Fruit Crop Breeding, VNIISPK, Zhilina, Orel district, RU302530 Orel oblast, Russia
²Institute of Horticulture, Graudu 1, Cerini, Krimunu pag., LV-3701 Dobeles nov., Latvia

Abstract:

Apple selections of Latvian breeding were evaluated in the Central zone of Russia since 1980, in total 32 cultivars and hybrids. After long-term evaluation, the following can be recommended for use in breeding of scab resistant cultivars with high quality fruits – ‘Dace’ (gene Rvi6), ‘Arona’, and good storage – ‘Edite’ (Rvi6), ‘Forele’, ‘Olga’, ‘Маdоna’, for breeding of early cultivars – ‘Roberts’ and DI-93-4-8, both resistant to scab (gene Rvi6) and fruit rots. Cultivars and hybrids with the best cold resistance of vital tissues were selected by artificially modelling winter-hardiness components − early colds (1st component) and mid-winter colds up to -38 °C (2nd component), showing reversible damages not exceeding 2.0 points: ‘Daina’, ‘Ella’, ‘Atmoda’, ‘Gita’, ‘Saiva’, of which the last 3 maintained high hardiness of bark, cambium and xylem with slight increase of bud damages also at -40 °C. Cultivars ‘Daina’ and ‘Ella’ showed resistance of buds and vital tissues on the level of ‘Antonovka’ after modelling a thaw with following freezing to -25 °С (3rd component), which suggests tolerance to fluctuating winter temperatures. These cultivars demonstrated good adaptation to different environment conditions and may be considered in breeding of new adaptive apple cultivars with high fruit quality.

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2693–2700 Dz. Dēķena, D. Feldmane and V. Laugale
Preliminary results of rootstock evaluation for Estonian sweet cherry cultivar ‘Anu’
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Preliminary results of rootstock evaluation for Estonian sweet cherry cultivar ‘Anu’

Dz. Dēķena*, D. Feldmane and V. Laugale

Institute of Horticulture (LatHort), Graudu iela 1, LV-3124 Dobele, Latvia

Abstract:

Mahaleb cherry (Prunus mahaleb L.) is the most widely used rootstock for sweet cherries in Latvia, however it has several disadvantages – strong vigour of grafted trees and an intolerance to heavy, waterlogged soils. The aim of the study was to test the suitability of rootstocks of different origins for winter-hard sweet cherry cultivar in Latvian climate. The trial was established in the spring of 2014 at the Institute of Horticulture (LatHort) to test four clonal rootstocks: ‘PiKu 1’, PHL-A’, ‘GiSelA 5’, ‘VSL-1’, and generative rootstock P. mahaleb (control) grafted with cultivar ‘Anu’ (Estonian breeding). Cherries were planted at 5×3.5 m in a random block design in three replications with three trees per plot. Tree height, annual growth of shoots, the viability of trees after wintering period and the intensity of flowering and production were evaluated in 2016–2019. Sweet cherry cultivar ‘Anu’ had the best overall winter-hardiness in the combinations with rootstocks ‘GiSelA 5’ and P. mahaleb. The highest intensity of flowering and production were observed in trees grafted on ‘GiSelA 5’. Trees on ‘VSL-1’ had the highest decease rate and the lowest winter hardiness.

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