Evaluation of European plum rootstocks in Latvia
2008
Lepsis, J., Pure Horticultural Research Centre, Tukuma reg. (Latvia) | Dekena, Dz., Pure Horticultural Research Centre, Tukuma reg. (Latvia) | Dekens, V., Pure Horticultural Research Centre, Tukuma reg. (Latvia)
The performance of eight generative propagated rootstocks (St.Julien INRA 2, St.Julien d'Orleans, St.Julien Noir, Brompton, Wangenheims Zwetsche, St.Julien Wädenswill, Myrobalan, Caucasian plum (local type of myrobalan) and 8 vegetative propagated rootstocks (St.Julien A, Brompton, Ackermann, Pixy, Hamyra, Marianna GF8/1, G5/22, GF 655/2) with the European plum cultivar `Victoria` and hybrid cherry plum cultivar `Kometa Kubanskaya` were evaluated in a field trial in Latvia since 2001. Sufficient winter hardiness is one of the most important criteria for rootstocks in Latvia conditions. Some critical winters were observed during last several years. The winter of 2002/03 had low temperature, until -36 deg C at a snow level in the orchard. During winters of 2004/05 and 2006/07 low temperatures were observed at the end of the winter, while winter of 2006/07 had high temperature at the beginning. The survival, tree health in general and tree growth parameters were observed to evaluate the tree winter hardiness and renovation ability. The rootstocks had some influence on the tree winter hardiness. All of the European rootstocks had similar or better winter hardiness than the local rootstock Caucasian plum. Unsatisfactory viability was observed for cv. `Kometa Kubanskaya` on the rootstocks St.Julien INRA 2, St.Julien W’denswill, Myrobalan, Caucasian plum, St.Julien A, Ackermann, Pixy, Hamyra; and for cultivar `Victoria` on the rootstocks Myrobalan, Caucasian plum, Marianna GF 8/1, Pixy and Brompton cuttings.
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